Low-Temperature Ammonia Oxidation Over Pt/γ-Alumina: The Influence of the Alumina Support

被引：0
|
作者：
D.P. Sobczyk
E.J.M. Hensen
A.M. de Jong
R.A. van Santen
机构：
[1] Schuit Institute of Catalysis,Laboratory of Inorganic Chemistry and Catalysis, Eindhoven University of Technology
[2] Eindhoven University of Technology,Department of Applied Physics, Centre of Plasma and Radiation Physics
来源：
Topics in Catalysis | 2003年 / 23卷
关键词：
NH; N]NH; O; [; O]O; ammonia oxidation; deactivation; platinum; Pt/γ-alumina; positron-emission profiling;
D O I：
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中图分类号：
学科分类号：
摘要：
Deactivation of a Pt/γ-alumina catalyst used for low-temperature ammonia oxidation was studied using positron-emission profiling (PEP). Evidence is presented that irreversibly adsorbed nitrogen and oxygen species deactivate the catalyst. This deactivation is further accelerated by preadsorption of oxygen on the catalyst. Ammonia strongly interacts with the alumina support. A steady state of the ammonia oxidation reaction is reached after the alumina sites are saturated with ammonia. PEP experiments show that spillover of oxygen to the support is not significant during the ammonia oxidation.
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页码：109 / 117
页数：8
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