ACTIVITY AND DEACTIVATION OF LA(0.8)CA(0.2)CR(0.9)X(0.1)O(3) (X=NI, CO) IN DRY METHANE USING TEMPERATURE-PROGRAMMED TECHNIQUES

被引：17

作者：

BAKER, RT ^{[1
]}

METCALFE, IS ^{[1
]}

机构：

[1] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT CHEM ENGN & CHEM TECHNOL, LONDON SW7 2BY, ENGLAND

来源：

APPLIED CATALYSIS A-GENERAL | 1995年 / 126卷 / 02期

关键词：

COBALT; DEACTIVATION; LANTHANUM CALCIUM CHROMIUM OXIDE; METHANE OXIDATION; NICKEL; TEMPERATURE-PROGRAMMED TECHNIQUES;

D O I：

10.1016/0926-860X(95)00019-4

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：

A combination of temperature-programmed (TP) and isothermal experiments were performed on the candidate solid oxide fuel cell (SOFC) anode materials, La(0.8)Ca(0.2)Cr(0.9)X(0.1)O(3) (X=Ni, Co), to investigate their suitability for use with dry methane feeds. Comparing with the behaviour of the unsubstituted material, La0.8Ca0.2CrO3 [1], the Ni and Co doping were found to have a marked modifying effect on the ease and extent of reduction of the materials. The total extent of reduction was higher than for the unsubstituted oxide. Two main reaction regimes were identified, as for the unsubstituted material, involving complete oxidation and methane dissociation. Complete oxidation only occurred over the pre-oxidised material. When reduced at high temperatures, the Ni-substituted material displayed behaviour characteristic of both La0.8Ca0.2CrO3 and Ni-YSZ cermet [2] indicating that segregation of Ni occurs during high temperature reduction.

引用

页码：319 / 332

页数：14

共 19 条

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