The high global warming potential of nitrous oxide (N₂O) led to its recent inclusion in the list of regulated pollutants under the emerging greenhouse gas regulations. While N₂O can be present in small quantities among the combustion products, it can also be generated as a minor byproduct in various types of aftertreatment systems. In this work, a systematic review of sources of N₂O is presented, along with the potential mechanisms of formation in a typical selective-catalytic-reduction-based diesel exhaust aftertreatment system. It is demonstrated that diesel oxidation catalysts (DOC), selective catalytic reduction (SCR) catalyst, and ammonia slip catalyst (ASC) can all potentially contribute to N₂O formation, depending on the catalyst material and exhaust gas conditions, as well as aftertreatment operation strategies. Furthermore, catalysts used in SCR aftertreatment system are also shown to decompose and/or reduce N₂O to N₂ under select conditions. However, the temperature windows of N₂O formation and decomposition/reduction do not overlap. This requires that N₂O control be focused on reducing its formation by means of optimizing catalyst formulation, system architecture, and operation strategies.
N2O Formation and Mitigation in Diesel Aftertreatment Systems
Sae Int. J. Engines
SAE 2012 World Congress & Exhibition ; 2012
Sae International Journal of Engines ; 5 , 2 ; 688-698
2012-04-16
11 pages
Conference paper
English
N~2O Formation and Mitigation in Diesel Aftertreatment Systems
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