Impurity and support effects on surface composition and CO plus NO reactions over Pt-Rh/CeO2 nanoparticles:: A comparative study

被引：2
|
作者：
Khanra, B [1 ]
De Sarkar, A [1 ]
机构：
[1] Saha Inst Nucl Phys, Condensed Matter Phys Grp, Kolkata 700064, W Bengal, India
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2003年 / 17卷 / 27期
关键词：
Monte Carlo simulation; nanoparticles; metal-support interaction; surface segregation;
D O I：
10.1142/S0217979203022817
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A Monte Carlo simulation technique has been used to investigate the effect of sulphur impurity and ceria support on the surface composition and catalytic activity of Pt-Rh/ceria nanocatalysts. For temperatures in the range of 400-1300 K the surface Pt concentration decreases with increase in sulphur coverage. The Pt concentration at the base of the nanocatalyst in contact with the support increases with metal-support interaction. However, for weak metal-support interaction (V-ms < -0.01 eV) the surface Pt concentration slightly increases with metal-support interaction. Overall, sulphur is found to influence the surface composition much more strongly than the metal-support interaction. The MC-simulated surface composition results have been used to study the energetics of the CO + NO reactions over Pt-Rh/CeO2 catalysts. It is found that the CO2 formation rate decreases with increase in sulphur coverage and marginally increases with metal-support interaction up to V-ms = -0.01 eV. All the results qualitatively agree with the experimental results.
引用
收藏
页码：4831 / 4839
页数：9
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