Tungstophosphoric acid supported onto hydrous zirconia: Physicochemical characterization and esterification of 1° and 2° alcohol

Bulletin of materials science

Pankaj Sharma¹  Anjali Patel¹ 

[1] Chemistry Department, Faculty of Science, M.S. University of Baroda, Vadodara 390 002, India$$Chemistry Department, Faculty of Science, M.S. University of Baroda, Vadodara 390 002, IndiaChemistry Department, Faculty of Science, M.S. University of Baroda, Vadodara 390 002, India$$

关键词: Hydrous zirconia;    heteropolyacid;    morphology;    particle size;    acidity.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The Keggin type heteropolyacid, 12-tungstophosphoric acid (PW), was supported onto hydrous zirconia (Z) by impregnation method and designated as ZH₃. The ZH₃ was calcinated at 300°C and 500°C and designated as ZH₃₃ and ZH₃₅, respectively. The resulting materials were characterized by FTIR, diffuse reflectance spectroscopy (DRS), XRD, surface area measurement (BET method) and particle size distribution. The surface morphology was studied by scanning electron microscopy. The acidity of all materials was evaluated by carrying out chemisorption of ammonia and esterification of 1° alcohol (ð‘�??-butanol) with different acids like formic acid, acetic acid and propionic acid and 2° alcohol (cyclohexanol, iso-butanol) with acetic acid. Above studies show the high dispersion of HPA in a non-crystalline form on the support as well as uniform distribution of particles of ZH₃ which contains 30% 12-tungstophosphoric acid. It also shows that when ZH₃ was calcinated at 500°C, it possesses highest acidity for both chemisorption of NH₃ as well as esterification reactions.

【 授权许可】

Unknown