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Periodic Control for Improved Low-Temperature Catalytic Activity |
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| Authors: | Carlsson Per-Anders Thormählen Peter Skoglundh Magnus Persson Hans Fridell Erik Jobson Edward Andersson Bengt |
| Affiliation: | (1) Competence Centre for Catalysis and Departments of Chemical Reaction Engineering and Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden;(2) Competence Centre for Catalysis and Department of Applied Surface Chemistry, Chalmers University of Technology, Göteborg, Sweden;(3) Competence Centre for Catalysis and Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden;(4) Competence Centre for Catalysis, Chalmers University of Technology, Göteborg, Sweden;(5) Volvo Technological Development, SE-405 08 Göteborg, Sweden;(6) Competence Centre for Catalysis and Department of Chemical Reaction Engineering, Chalmers University of Technology, Göteborg, Sweden |
| Abstract: | 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. |
| Keywords: | platinum carbon monoxide catalytic oxidation low temperature activity self-poisoning cold start emissions periodic pulsing transient changes |
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