INFLUENCE OF THE CO-PRECIPITATION pH ON THE PHYSICO-CHEMICAL AND ACTIVITY PROPERTIES OF VANADIUM ALUMINUM OXIDE CATALYST

BLANGENOIS, N.; FLOREA, M.; PRADA S., R.; GRANGE, P.; CHENAKIN, S. P.; BASTIN, J. M.; KRUSE, N.; BARBERO, BIBIANA; LUIS EDUARDO CADUS

APPLIED CATALYSIS A-GENERAL

ELSEVIER SCIENCE BV

Año: 2004 vol. 263 p. 163 - 170

0926-860X

Vanadium-aluminum oxide catalysts for propane oxidative dehydrogenation (ODH) are investigated with respect to their physico-chemical properties and catalytic activity as a function of the co-precipitation pH. Modifications of the specific surface area, the particle size distribution, and the chemical nature of the active phase are found. At co-precipitation pH 5.5, an amorphous V-Al-Ox mixed phase was formed by condensation of tetrahedral polymeric [VOx]n n. and amorphous aluminum hydroxide species. At pH between 7.5 and 8.5, the catalyst consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. and amorphous aluminum hydroxide species. At pH between 7.5 and 8.5, the catalyst consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. and amorphous aluminum hydroxide species. At pH between 7.5 and 8.5, the catalyst consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH consists of [VOx]n n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH n. species supported on amorphous aluminum hydroxide. At pH = 10, V2O7 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH 4. ions are presumably adsorbed on boehmite surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH surface. The propane conversion and the rate of propylene formation per gram-atom of vanadium are higher for the samples prepared at pH condensation of tetrahedral polymeric [VOx]