COKING KINETICS OF FRESH AND THERMALLY AGED COMMERCIAL CR2O3/AL2O3 CATALYST

被引：21

作者：

PENA, JA ^{[1
]}

MONZON, A ^{[1
]}

SANTAMARIA, J ^{[1
]}

FIERRO, JLG ^{[1
]}

机构：

[1] CSIC,INST CATALISIS & PETR QUIM,E-28049 MADRID,SPAIN

来源：

APPLIED CATALYSIS A-GENERAL | 1993年 / 101卷 / 02期

关键词：

AGING; CHROMIA ALUMINA; COKING; DEACTIVATION; KINETICS;

D O I：

10.1016/0926-860X(93)80268-U

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 coking behaviour of fresh and of thermally aged Cr2O3/Al2O3 catalysts has been studied during the dehydrogenation of n-butene to butadiene using a themogravimetric system. The results show that catalyst aging decreases considerably the rate of the main reaction, but also the rate of coking. As a consequence, the dehydrogenation rates obtained after a certain reaction time with aged catalyst were higher than those for fresh catalyst. The analysis of the coking kinetics on fresh and on thermally aged catalyst and the X-ray photoelectron spectroscopy results obtained on both samples suggest that the deactivation mechanism is not changed by the aging process, and that the main effect of aging is to reduce the number of sites available on the surface for the main and coking reactions.

引用

页码：185 / 198

页数：14

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