Abstract

Abstract NOx storage-reduction catalysts (NSR catalysts) have developed for lean-burn and gasoline direct injection engines. One of the main causes of deterioration of NSR catalysts is sulfur poisoning. SO 2 is oxidized on the precious metal and reacts with the NOx storage compounds to form sulfates. The decomposition of formed sulfates is essential to improve the durability of the catalyst. The composition of NOx storage components and acidity of supports are optimized to minimize the growth of the size of sulfate particles. The enhancement of the dispersion of the precious metal also affects sulfate decomposition.

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