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

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.

Emission Control in Catalytic Converter by using Natural Liquid

“…It is recommended to use diesel oxidation catalyst and cooled exhaust gas recirculation for reduced emission of HC, CO and particulate matter and NO X respectively. [11] revealed the deposition of phosphorous in accordance to the decline in the performance of the catalyst over a period of time. This paper also described a model that combined both poisoning and sintering techniques of ageing, which was later transformed into fluid dynamic model.…”