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Selective catalytic reduction: Adding an ammonia slip catalyst mitigates dosing errors
The Canadian Journal of Chemical Engineering ( IF 2.1 ) Pub Date : 2021-08-27 , DOI: 10.1002/cjce.24293
Michelle Bendrich 1, 2 , Bastian Opitz 2, 3 , Alexander Scheuer 2 , Robert E. Hayes 1 , Martin Votsmeier 2, 3
Affiliation  

This paper uses computational simulation to compare the performance of two catalytic systems designed for the removal of oxides of nitrogen from automotive engine exhaust using selective catalytic reduction (SCR). The first system is comprised of an SCR catalyst alone, whilst the second system adds an ammonia slip catalyst (ASC) to the end of an SCR catalyst. Both systems had the same total length. Comparisons of the NOx removal efficiency and the degree of ammonia slip are made using driving cycles and an optimized ammonia dosing strategy. Comparisons are also made for the case where a constant error in the ammonia dosing occurs. The addition of the ASC reduces ammonia slip during over-dosing scenarios and gives a greater NOx conversion during under-dosing cases. This work concludes that the ASC is a positive addition to the SCR in meeting the exhaust emission regulations. Although it does not necessarily allow for a higher NOx conversion, its ability to cope with under- and over-dosing situations can be beneficial in catalyst aging and unpredictable driving conditions.

中文翻译:

选择性催化还原:添加氨泄漏催化剂可减轻剂量错误

本文使用计算模拟来比较两种催化系统的性能,该系统设计用于使用选择性催化还原 (SCR) 从汽车发动机尾气中去除氮氧化物。第一个系统仅由 SCR 催化剂组成,而第二个系统在 SCR 催化剂的末端添加了氨泄漏催化剂 (ASC)。两个系统的总长度相同。使用驱动循环和优化的氨剂量策略对 NO x去除效率和氨泄漏程度进行了比较。还对氨计量中出现恒定误差的情况进行了比较。添加 ASC 可减少过量投加情况下的氨泄漏并产生更大的 NO x在剂量不足的情况下转换。这项工作得出的结论是,ASC 是 SCR 在满足废气排放法规方面的积极补充。虽然它不一定允许更高的 NO x转化率,但它应对剂量不足和过量情况的能力在催化剂老化和不可预测的驾驶条件下可能是有益的。
更新日期:2021-08-27
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