KINETICS OF DEACTIVATION OF BIFUNCTIONAL PT/AL2O3-CI CATALYSTS BY COKING

被引：27

作者：

BELTRAMINI, JN

WESSEL, TJ

DATTA, R

机构：

[1] UNIV IOWA,DEPT CHEM & BIOCHEM ENGN,IOWA CITY,IA 52242

[2] UNIV QUEENSLAND,DEPT CHEM ENGN,ST LUCIA,QLD 4067,AUSTRALIA

来源：

AICHE JOURNAL | 1991年 / 37卷 / 06期

关键词：

D O I：

10.1002/aic.690370607

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The catalytic activity, product selectivity, and coke deposition were studied during methylcyclopentane (MCP) reforming on bifunctional Pt/Al2O3-Cl reforming catalysts with different metal loadings, but constant metal dispersion as well as constant Cl loading. Surprisingly, the overall conversion of MCP was found to decrease as the metal content of the catalyst increased. Analysis of the coke by temperature programmed oxidation (TPO) revealed two distinct peaks, one associated with coke on the metallic function and the other associated with coke on the acidic function. The change of activity of the metal and acid functions with time was monitored by following the rates of hydrogenolysis and hydrocracking, respectively. A mechanistically-based dual-site model for the kinetics of coke formation and the resulting deactivation was developed. The model successfully correlates the experimental data and is an improvement over existing models, since it explicitly accounts for the deactivation of both the metal and the acid functions.

引用

页码：845 / 854

页数：10

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