Influence of Pt Loading in Aged NOx Storage and Reduction Catalysts

被引：20

作者：

Liu, Zhaoqiong ^{[1
]}

Epling, William S. ^{[2
]}

Anderson, James A. ^{[1
]}

机构：

[1] Univ Aberdeen, Surface Chem & Catalysis Grp, Dept Chem, Aberdeen AB24 3U, Scotland

[2] Univ Waterloo, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 04期

关键词：

DISPERSION; PERFORMANCE; OXIDATION; BEHAVIOR; PT/AL2O3; REMOVAL;

D O I：

10.1021/jp1040037

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 series of Pt/BaO/Al2O3 samples have been prepared with nominal Pt loadings ranging from 0.5 to 3.5 wt %. These samples were characterized in their fresh state and then subjected to an accelerated, mild, aging process which involved exposure of the catalysts to alternating rich and lean gas mixtures at 773 K. Characterization and storage results for the aged catalysts have been obtained. Aging effects were dependent on Pt loadings although there was no clear correlation between loading and the extent to which dispersion was lost during the accelerated aging process. Particular attention was given to the loadings and their temperature sensitive impacts on the form of the storage and release profiles including the NOx release spike accompanying the switch from lean to rich operation. Higher Pt loadings reduce the extent of NOx slip during lean to rich transition for low temperature operation.

引用

页码：952 / 960

页数：9

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