Toluene methylation on Al13- and GaAl12-pillared clay catalysts

被引：35

作者：

Benito, I ^{[1
]}

del Riego, A ^{[1
]}

Martínez, M ^{[1
]}

Blanco, C ^{[1
]}

Pesquera, C ^{[1
]}

González, F ^{[1
]}

机构：

[1] Univ Cantabria, Dept Quim, E-39005 Santander, Spain

来源：

APPLIED CATALYSIS A-GENERAL | 1999年 / 180卷 / 1-2期

关键词：

pillared clays; toluene methylation;

D O I：

10.1016/S0926-860X(98)00328-7

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 catalytic activity and selectivity of montmorillonite pillared with Al-13 and GaAl12 polyoxycations have been investigated at temperatures between 573 K and 673 K for the gas-phase microcatalytic alkylation of toluene with methanol. A mixture of xylenes (XYs) was obtained as the main reaction products: 69% and 74% of xylenes for the Al- and GaAl-PILC catalysts, respectively, at 573 K. Trimethylbenzenes (1,2,4- and 1,2,3-isomers) were also found (31% and 26% for the Al and GaAl catalysts, respectively, at 573 K). The XY-isomer distribution followed the order o>p>m. The influence of the toluene concentration in methanol (2.5; 1.0; 0.5 M) upon the conversion of toluene and the selectivities of the products were also investigated. An increase in toluene molarity produced a decrease in toluene conversion and an increase in xylene selectivity for both the Al and GaAl catalysts. A good correlation was obtained between catalytic activity and increase in acid sites, as determined by pyridine and dimethylpyridine chemisorption in the gas-phase. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：175 / 182

页数：8

共 19 条

[1] A GAS CHROMATOGRAPHIC STUDY OF THE CATALYTIC ISOMERIZATION OF CYCLOPROPANE [J].