Exhaust-gas reforming using precious metal catalysts

被引：28

作者：

Peucheret, Sylvain ^{[1
]}

Feaviour, Mark ^{[1
]}

Golunski, Stan ^{[1
]}

机构：

[1] Johnson Matthey Technol Ctr, Reading RG4 9NH, Berks, England

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2006年 / 65卷 / 3-4期

关键词：

exhaust-gas reforming; platinum; rhodium; sulphur poisoning;

D O I：

10.1016/j.apcatb.2006.01.009

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：

Rh-only and Rh bimetallic catalysts have been screened for exhaust-gas reforming, under conditions that mimic the output of an autoignition gasoline engine. Propane has been used as a model fuel, with simulated exhaust-gas providing the co-reactants (O-2 and H2O) needed to generate hydrogen. Based on oxygen-conversion as a measure of light-off, Pt-Rh on ceria-zirconia shows the highest activity. In the presence of SO2, adsorbed sulphur species do not inhibit the oxidation reactions that induce light-off, but suppress the major pathway to hydrogen (steam reforming). By excluding platinum and using silica-enriched alumina as the underlying support, light-off is delayed, but the steam reforming reaction becomes much more insensitive to the presence of sulphur. The Pt-Rh catalyst is most suited to exhaust-gas reforming systems in which the engine runs on a sulphur-free fuel, whereas the Rh-only catalyst is the better choice when the fuel is conventional gasoline. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：201 / 206

页数：6

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