CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
Alcohol acetylatio with acetic acid using borated zirconia as catalyst
LILIAN OSIGLIO; GUSTAVO ROMANELLI; M. BLANCO
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 2010 vol. 316 p. 52 - 52
The use of zirconium oxide doped with boron (borated zirconia) as catalyst in the acetylation of alcoholsand phenol was studied. The catalysts were obtained by employing different preparation conditions, inorder to observe the effect of the concentration of the precursor in the solution used to obtain the oxide,the concentration of the boron precursor, and the calcination temperature. All the solids showed amorphouscharacteristics and strong acidity. Boron addition increased the temperature range of the hydratedoxide stability, which depends on the boron concentration in the sample. Besides, the characterizationby infrared spectroscopy showed an effect on the boron species present in the solid depending on theadded concentration. The three preparation conditions under study affected the textural properties of thecatalysts, as well as their acid strength. It was observed that in the acylation of alcohols using acetic acidas acylating agent and toluene as reaction solvent, at reflux temperature, the yield of acetylated productcorrelated with the acid strength of the catalysts, which depended on the preparation conditions. The bestyield was achieved with a catalyst obtained using a high solution concentration of the oxide precursor(0.56 mmoles Zr/cm3), an intermediate boron concentration (15 g B2O3/100 g support) and a relativelylow calcination temperature (320 ◦C).