Abstract
Ptbamnce/Al as a High-Efficiency Catalyst for Nox Storage and Reduction as a Function of Cycling Conditions
Highlights
Lower CO2 emissions from automotive sources are necessary and lead to the development of diesel and lean-burn engines
The major drawback of this system is the deactivation of the catalyst, mainly due to sulfur poisoning [2,3], and ammonia emission can be formed during the short excursion under rich conditions, especially when hydrogen is used as reducer [ -6]
At 400 oC with 3% H2 in the rich pulses, the hydrogen conversion reaches 100% with PtBaMnCe/Al catalyst situ at 450 oC under 3% H2, 10% H2O, 10% CO2 and N2 for 15min
Summary
Lower CO2 emissions from automotive sources are necessary and lead to the development of diesel and lean-burn engines. The catalyst is regenerated: the stored NOx NO2) are reduced in N2 during a short excursion in rich condition. In our previous study [5], ammonia intermediate pathway was clearly demonstrated for the reduction of the stored NOx with H2. It appears that, when hydrogen is missing in the rich pulses, that are fully converted, the ammonia selectivity tends to be nil because the produced NH3 can react with the remaining stored NOx. In opposition, if some hydrogen remains, the ammonia selectivity increases with the amount of excessive hydrogen. This is a fundamental result for our step: catalyst modification for a better NOx conversion to N2
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