CONVERSION OF CHLOROMETHANE OVER METAL-EXCHANGED ZSM-5 TO HIGHER HYDROCARBONS

被引：52

作者：

LERSCH, P ^{[1
]}

BANDERMANN, F ^{[1
]}

机构：

[1] UNIV GESAMTHSCH ESSEN, INST TECH CHEM, UNIV STR 5, W-4300 ESSEN 1, GERMANY

来源：

APPLIED CATALYSIS | 1991年 / 75卷 / 01期

关键词：

CATALYST CHARACTERIZATION (BET; TPD); CHLOROMETHANE; COKE FORMATION; DEHYDROHALOGENATION ION EXCHANGE; ZEOLITES; ZSM-5;

D O I：

10.1016/S0166-9834(00)83129-2

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 effects of metal-exchange and metal-impregnation of zeolite ZSM-5 catalysts with alkaline earth metals magnesium, calcium and barium and some transition metals such as silver, copper, chromium, zinc, nickel, cerium, cobalt and manganese on the conversion of chloromethane were studied. Activity, selectivity and lifetime of the catalysts significantly depended on the cation chosen for modification. Temperature-programmed desorption of ammonia and BET measurements showed, that acidic properties as well as free channel passages are affected by exchange and impregnation. Magnesium exchange ZSM-5 exhibited both the highest activity and the lowest deactivation due to less coke formation and to decreased formation of aromatics, especially C9+ aromatics. This could be confirmed by a long-term aging test with magnesium ZSM-5 pellets under semi-technical conditions. It was found, that correlations could be derived between certain product selectivities and electronegativity equalization concepts of both Pauling and Sanderson.

引用

页码：133 / 152

页数：20

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