The conversion of isobutane on silica-supported 12-tungstophosphoric and 12-molybdophosphoric acids: a reflection of their acidities

被引：8

作者：

Gao, S

Moffat, JB ^{[1
]}

机构：

[1] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[2] Univ Waterloo, Guelph Waterloo Ctr Grad Work Chem & Biochem, Waterloo, ON N2L 3G1, Canada

来源：

APPLIED CATALYSIS A-GENERAL | 2002年 / 229卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会;

关键词：

conversion selectivity; isobutane; heteropoly acids; tungstophosphoric acid; molybdophosphoric;

D O I：

10.1016/S0926-860X(02)00032-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The conversion of isobutane and the selectivities to products are studied on silica-supported 12-tungstophosphoric acid (H(3)PW(12)O(40), abbreviated as HPW) and 12-molybdophosphoric acid (H(3)PMo(12)O(40), abbreviated as HPMo) for various loadings, reaction temperatures, contact times and times-on-stream. The conversions and selectivity patterns are markedly dissimilar for the two acids with carbenium ion and hydride transfer processes catalyzed on the former at temperatures as low as 200 degreesC but not on the latter, a reflection of the stronger acidic sites on the tungsten-containing acid than on 12-molybdophosphoric acid. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：245 / 250

页数：6