Effect of alloy composition on dispersion stability and catalytic activity for NO oxidation over alumina-supported Pt-Pd catalysts

被引：75
作者：
Graham, G. W.
Jen, H.-W.
Ezekoye, O.
Kudla, R. J.
Chun, W.
Pan, X. Q.
McCabe, R. W.
机构：
[1] Ford Motor Co, Dept Chem Engn, Dearborn, MI 48121 USA
[2] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
来源：
CATALYSIS LETTERS | 2007年 / 116卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
Pt; Pd; alloy; particle coarsening; NO oxidation;
D O I：
10.1007/s10562-007-9124-7
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：
Applying a synthesis procedure that promotes alloy formation, highly-dispersed alumina-supported Pt-Pd catalysts spanning the Pt-rich half of the composition range were prepared, aged under oxygen-rich hydrothermal conditions, and characterized by CO chemisorption, XRD, and TEM. Anomalously large particles, typical of pure Pt catalysts treated under such conditions, were not found in any of the Pd-containing catalysts, and the extent of particle coarsening due to aging was found to decrease with increasing Pd content. Alloying appears to have little effect on the NO oxidation turn-over frequency, which increases with decreasing dispersion.
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页码：1 / 8
页数：8
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