EFFECTS OF RHODIUM ADDITION ON METHANE OXIDATION BEHAVIOR OF ALUMINA-SUPPORTED NOBLE-METAL CATALYSTS

被引：49

作者：

OH, SH

MITCHELL, PJ

机构：

[1] Physical Chemistry Department, General Motors NAO Research and Development Center, Warren

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 1994年 / 5卷 / 1-2期

关键词：

CONVERTER (CATALYTIC); EXHAUST; METHANE OXIDATION; RHODIUM;

D O I：

10.1016/0926-3373(94)00034-4

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：

Laboratory methane oxidation experiments were conducted using a series of catalyst samples prepared by impregnating Ph-free noble metal catalysts (i.e., Pt/Pd, Pt or Pd) with various amounts of rhodium (0.0035, 0.005, and 0.014 wt.-% Rh). The addition of these small amounts of rhodium did not significantly change the temperature required for the onset of the methane oxidation. However, variable-composition experiments conducted at a temperature characteristic of warmed-up catalytic converters (ca. 550 degrees C) reveal that the rhodium addition tends to shift the optimum feedstream stoichiometry (at which a maximum methane conversion occurs) toward more reducing conditions. These Rh-induced effects on methane conversion behavior appear to be independent of how the rhodium is incorporated in the catalyst.

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收藏

页码：165 / 179

页数：15

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