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The catalyst model which considers diffusion phenomena in the wash-coat layer has been developed and applied to NOx storage reduction (NSR) catalysts under sulphur poisoning condition. In this model, the effective reaction rate, which can be measured by experiments, is expressed as the harmonic mean of the diffusion rate from bulk gas phase to wash-coat surface in the channel, the diffusion rate in the wash-coat layer which has a large number of pores and reaction rate on the noble metal surface. Analysis of numerical results of NOx reduction phesomena of NSR catalysts by means of this model leads to following conclusions. Sulphur poisoning level doesn't affect NOx reduction reaction rate constants on the noble metal surface. The effective NOx reduction rate is dominated by the diffusion rate in the wash-coat layer at temperatures approximately over 600 K.

nihon kikai gakkai ronbunshū. b

Numerical Prediction of NOx Reduction Amount by NOx Storage-Reduction Catalysts under Sulphur Poisoning Condition (Application of Catalyst Model Considering Diffusion into Wash-Coat)