Storage-Reduction of NO_x over Combined Catalysts of Pt/Ba/Al_2O_3-Mn/Ba/Al_2O_3: Carbon Monoxide as Reductant

摘要

Storage-reduction of NO_x by carbon monoxide was investigated over combined catalysts of Mn/Ba/Al_2O_3-Pt/Ba/Al_2O_3. Combination of Mn/Ba/Al_2O_3 and Pt/Ba/Al_2O_3 catalysts in different ways showed excellent NO_x storage-reduction performance and the content of Pt could be reduced by 50%. Not only the addition of 5Mn/15Ba/Al_2O_3 to 1Pt/15Ba/Al_2O_3 could improve its storage ability, but also enhance the NO_x conversion consequently. NO_x conversion over the combined catalysts (the combined catalysts Ⅰ and Ⅱ) was increased under dynamic lean-rich burn conditions, the maximum NO_x conversion increased from 69.4% to respectively 78.8% and 75.7% over two combined catalysts.