The Role of Vanadia for the Selective Oxidation of Benzyl Alcohol over Heteropolymolybdate Supported on Alumina

作     者：Pasupulet Siva Nageswara RAO Kasanneni Tirumala Venkateswara RAO Potharaju S. SAI PRASAD Nakka LINGAIAH 

作者机构：Catalysis Laboratory Inorganic and Physical Chemistty Division Indian Institute of Chemical Technology Hyderabad 500 607 lndia 

出 版 物：《催化学报》 (Chinese Journal of Catalysis)

年 卷 期：2011年第32卷第11期

页      面：1719-1726页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0703[理学-化学] 

基　　金：supported by the Department of Science & Technology  New Delhi under SERC scheme  DST No. SR/S1/PC-40/2006 

主　　题：molybdophosphoric acid vanadia alumina oxidation benzyl alcohol 

摘      要：A series of 12-molybdophosphoric acid (MPA) supported on V2O5 dispersed γ-Al2O3 catalysts with different vanadia loadings were prepared by impregnation and characterized by N2 adsorption-desorption, X-ray diffraction, temperature-programmed reduction, in situ laser Raman spectroscopy, UV-Vis diffused reflectance spectroscopy, scanning electron microscopy, and temperature-programmed desorption of NH3 techniques. Their catalytic activities were evaluated for the vapor phase aerobic oxidation of benzyl alcohol. The catalysts exhibited high catalytic activity and the conversion of benzyl alcohol depended on the vanadia content while the catalyst with 15 wt% V2O5 content showed optimum activity. The characterization results suggest the presence of well-dispersed V2O5 and partially disintegrated Keggin ions of MPA on the support. In situ Raman studies showed a reduced Mo(IV) species when the catalysts were calcined at high temperatures. The high oxidation activity of the catalysts is related to the synergistic effect between MPA and V2O5.