Low-temperature ammonia oxidation over Pt/γ-alumina:: the influence of the alumina support

被引：49
作者：
Sobczyk, DP
Hensen, EJM
de Jong, AM
van Santen, RA
机构：
[1] Eindhoven Univ Technol, Schuit Inst Catalysis, Inorgan Chem & Catalysis Lab, NL-5600 MB Eindhoven, Netherlands
[2] Eindhoven Univ Technol, Dept Appl Phys, Ctr Plasma & Radiat Phys, NL-5600 MB Eindhoven, Netherlands
来源：
TOPICS IN CATALYSIS | 2003年 / 23卷 / 1-4期
关键词：
(NH3)-N-13; N-13]NH3,O-15(2),[O-15]O-2; ammonia oxidation; deactivation; platinum; Pt/gamma-alumina; positron-emission profiling;
D O I：
10.1023/A:1024876421421
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Deactivation of a Pt/gamma-alumina catalyst used for low-temperature ammonia oxidation was studied using positron-emission pro. ling (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.
引用
收藏
页码：109 / 117
页数：9
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