Periodic Control for Improved Low-Temperature Catalytic Activity

被引：0
|
作者：
Per-Anders Carlsson
Peter Thormählen
Magnus Skoglundh
Hans Persson
Erik Fridell
Edward Jobson
Bengt Andersson
机构：
[1] Chalmers University of Technology,Competence Centre for Catalysis and Departments of Chemical Reaction Engineering and Applied Physics
[2] Chalmers University of Technology,Competence Centre for Catalysis and Department of Applied Surface Chemistry
[3] Chalmers University of Technology,Competence Centre for Catalysis and Department of Applied Physics
[4] Chalmers University of Technology,Competence Centre for Catalysis
[5] Volvo Technological Development,Competence Centre for Catalysis and Department of Chemical Reaction Engineering
[6] Chalmers University of Technology,undefined
来源：
Topics in Catalysis | 2001年 / 16-17卷
关键词：
platinum; carbon monoxide; catalytic oxidation; low temperature activity; self-poisoning; cold start emissions; periodic pulsing; transient changes;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The influence of transient changes in the gas composition on the low-temperature activity of a commercial three-way catalyst and a Pt/Al2O3 model catalyst has been studied. By introducing well-controlled periodic O2 pulses to simple gas mixtures of CO or C3H6 (in N2), a substantial improvement of the low temperature oxidation activity was observed for both catalysts. The reason for low activity at low temperatures is normally attributed to self-poisoning by CO or hydrocarbons. The improved catalytic performance observed here is suggested to origin from the transients causing a surface reactant composition that is favourable for the reaction rate.
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页码：343 / 347
页数：4
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