Catalytic and physicochemical characterization of the MnVOx system. Influence of vanadium on methanol oxidation

M. VICTORIA CURIA; JORGE ENRIQUE SAMBETH; GAMBARO, LUIS

REACTION KINETICS, MECHANISMS AND CATALYSIS

SPRINGER

Lugar: Amsterdam; Año: 2012 vol. 106 p. 165 - 176

1878-5204

Abstract Manganese and mixed vanadium oxides were prepared by the hydrolysisof acetylacetonates. They were characterized by different techniques, such as X-raydiffraction, XPS, temperature-programmed surface reaction (TPSR), and conversionand selectivity measurements. TPSR studies showed that H2O, CO2, and O2 arepresent in manganese oxide samples and that the ones containing vanadium desorbCO2, H2O, methanol, formaldehyde, O2. The vanadium-free catalysts and the oneswith a lower vanadium content also exhibit high methanol conversion and selectivityto CO2 at higher temperatures. The selectivity to dimethyl ether is importantin the catalyst without V at lower temperature. The greatest conversion at lowertemperatures and the highest selectivities to CO2 are achieved with the catalystshaving the highest vanadium content.