Improvement of NOx Storage-Reduction Catalyst

Ichiro Hachisuka; Takeru Yoshida; Hideaki Ueno; Naoki Takahashi; Akihiko Suda; Masahiro Sugiura

doi:10.4271/2002-01-0732

2002-03-04

Improvement of NOx Storage-Reduction Catalyst 2002-01-0732

In order to further improve the performance of NO_x storage-reduction catalysts (NSR catalysts), focus was placed on their high temperature performance deterioration via sulfur poisoning and heat deterioration. The reactions between the basicity or acidity of supports and the storage element, potassium, were analyzed. It was determined that the high temperature performance of NSR catalysts is enhanced by the interaction between potassium and zirconia, which is a basic metal oxide. Also, a new zirconia-titania complex metal oxides was developed to improve high temperature performance and to promote the desorption of sulfur from the supports after aging.

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Improvement of NOx Storage-Reduction Catalyst 2002-01-0732

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