Periodic control for improved low-temperature catalytic activity

被引：21

作者：

Carlsson, PA ^{[1
]}

Thormählen, P

Skoglundh, M

Persson, H

Fridell, E

Jobson, E

Andersson, B

机构：

[1] Chalmers Univ Technol, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Dept Chem React Engn, SE-41296 Gothenburg, Sweden

[3] Chalmers Univ Technol, Dept Appl Phys, SE-41296 Gothenburg, Sweden

[4] Chalmers Univ Technol, Dept Appl Surface Chem, SE-41296 Gothenburg, Sweden

[5] Volvo Technol Dev, SE-40508 Gothenburg, Sweden

来源：

TOPICS IN CATALYSIS | 2001年 / 16卷 / 1-4期

关键词：

platinum; carbon monoxide; catalytic oxidation; low temperature activity; self-poisoning; cold start emissions; periodic pulsing; transient changes;

D O I：

10.1023/A:1016665216581

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

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 O-2 pulses to simple gas mixtures of CO or C3H6 (in N-2), 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.

引用

页码：343 / 347

页数：5

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