Phosphorus deposition on a three-way catalyst under accelerated ageing conditions

Author:

Benjamin S F1,Brogan M2,Collin T3,Disdale W1,Roberts C A1,Wei J4

Affiliation:

1. Automotive Engineering Applied Research Group, Coventry University, Coventry, UK

2. Ford Motor Company, Dunton Technical Centre, Laindon, Essex, UK

3. BASF Catalysts, Hannover, Germany

4. BASF Catalysts, Iselin, New Jersey, USA

Abstract

Degradation of catalyst performance with time is described as ageing. There are two significant ageing mechanisms: poisoning and sintering. Experimental data on ageing have been obtained on an engine test bed using a specially designed catalyst core holder; the catalyst samples were subjected to different accelerated ageing regimes and durations. The ageing regimes were as follows: low temperature dosed (mainly poisoning); high temperature not dosed (mainly sintering); high temperature dosed (both sintering and poisoning). The experiments provided a series of samples from which the spatial and time dependences of the poisoning have been found. Portions of the samples were subjected to X-ray fluorescence analysis after ageing. A combined model of poisoning and sintering was developed and incorporated into a computational fluid dynamics model. This combined model can predict the level of deactivation as a function of length along the catalyst and as a function of time. Agreement between measured poison accumulation and predictions was achieved by tuning the sintering parameter.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Aerospace Engineering

Reference10 articles.

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