CATALYTIC PROPERTIES OF NIX ZEOLITES IN THE PRESENCE OF CERIUM ADDITIVES

被引：8

作者：

CHIEN, SH ^{[1
]}

CHIANG, WL ^{[1
]}

机构：

[1] NATL TAIWAN UNIV, DEPT CHEM, TAIPEI 10764, TAIWAN

来源：

APPLIED CATALYSIS | 1990年 / 61卷 / 01期

关键词：

carbon monoxide hydrogenation; cerium; nickel; selectivity (C[!sub]2+[!/sub] hydrocarbons); zeolites;

D O I：

10.1016/S0166-9834(00)82134-X

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：

Cerium-containing NiX zeolites were prepared by the method of incipient-wetness impregnation. The nickel dispersion and the catalytic properties of the prepared catalysts were dependent on the Ce3+-to-Ni2+ ratio in zeolites. In the presence of cerium additives, NiX zeolites are able to exhibit a remarkable increase in nickel dispersion, and an enhanced reactivity in carbon monoxide hydrogenation with a shift of the product selectivity to heavier hydrocarbons. The results can be ascribed to the presence of the highly polarizing Ce3+ ions which induced some kind of metal-support interactions and thus led to the greater reducibility of nickel, to more accessible sites for carbon monoxide adsorption and to a larger surface concentration of hydrogen, which enhanced the hydrogen-assisted carbon monoxide dissociation during carbon monoxide-hydrogen reactions. The Ce3+ cations acted not only as "chemical anchors" but also as catalyst promoters. © 1990.

引用

页码：45 / 61

页数：17

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