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Storage-reduction of NOx by carbon monoxide was investigated over combined catalysts of Mn/Ba/Al2O3-Pt/Ba/Al2O3. Combination of Mn/Ba/Al2O3 and Pt/Ba/Al2O3 catalysts in different ways showed excellent NOx storage-reduction performance and the content of Pt could be reduced by 50%. Not only the addition of 5Mn/15Ba/Al2O3 to lPt/15Ba/Al2O3 could improve its storage ability, but also enhance the NOx conversion consequently. NOx conversion over the combined catalysts (the combined catalysts I and II) was increased under dynamic lean-rich burn conditions, the maximum NOx conversion increased from 69.4% to respectively 78.8% and 75.7% over two combined catalysts.
Storage-reduction of NOx by carbon monoxide was investigated over combined catalysts of Mn / Ba / Al2O3-Pt / Ba / Al2O3. Combination of Mn / Ba / Al2O3 and Pt / Ba / and the content of Pt could be reduced by 50%. Not only the addition of 5Mn / 15Ba / Al2O3 to lPt / 15Ba / Al2O3 could improve its storage ability, but also enhance the NOx conversion filter. NOx conversion over the combined catalysts (the combined catalysts I and II) was increased under dynamic lean-rich burn conditions, the maximum NOx conversion increased from 69.4% to 78.8% and 75.7% over two combined catalysts.