INVESTIGATION OF THE SURFACE CHARACTERISTICS AND CATALYTIC ACTIVITY OF Sb_xO_y/SiO_2CATALYSTS FOR VAPOR-PHASE SYNTHESIS OF ISOPRENE FROM ISOBUTYLENE AND FORMALDEHYDE

作     者：Dang Zhongyuan, Ding Shixing (Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China.) 

出 版 物：《分子催化》 (Journal of Molecular Catalysis(China))

年 卷 期：1989年第3卷第S1期

页      面：66-71页

核心收录：

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

主　　题：SURFACE dispersed crystalline silica gated catalysis synergistic spectrometer photoelectron crease 

摘      要：The surface characteristics and catalytic activity of SbxOY/ SiO2 catalysts forvapor-phasc synthesis of isoprene from isobutylene and formaldehyde have been investi-gated by TPR, XRD, XPS, IR and catalytic activity evaluation. The results show that whenthe Sb loadings are less than about 5 wt%,SbxOY is compIctely dispersed on the surface ofsilica to form a surface compound with Sb（V）=O group and the catalysts have relativelyhigh catalytic activity; when the Sb loadings are more than 5 wt%, in addition to this surfacccompound, the crystalline α-Sb2O4 is formed on the support surface and causes rapid de-crease of catalytic activity. It is suggcsted that the catalytic activity of SbxOY /siO2 catalystsresults from synetgistic catalysis of the surface compound Sb（V）=O as the basic sites andthe surface silanol Si-OH as the acidie sites. The mechanism of this synergistic catalysis forisoprene production is discussed.