NO+H-2 reaction on Pt-Ru/SiO2 catalysts: Correlation between nanostructure and catalytic activity and selectivity

被引:10
作者
Diaz, G
GomezCortes, A
Benaissa, M
机构
[1] Instituto de Física, Univ. Nac. Auton. de México, Mexico 01000
关键词
NOx reduction; bimetallic catalysts; HREM;
D O I
10.1007/BF00806901
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
Nitric oxide reduction by hydrogen has been studied on Pt-Ru/SiO2 catalysts of various Pt/Ru atomic compositions in the temperature range 298-673 K. Physical characterization showed the presence of bimetallic particles which tend to be Pt-rich. The overall activity of the bimetallic catalysts suggests a dilution of the active component (Pt) in the range 373-523 K. The addition of Ru results in a general improvement of the N-2 selectivity and significant modifications in the product distribution are observed as a function of the catalyst composition. A bimetallic particle model is proposed in which various types of surfaces are exposed including those with pure Pt atoms and/or Pt-Ru mixture. This model allows to explain the overall activity and selectivity in the whole series of catalysts.
引用
收藏
页码:63 / 72
页数:10
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