Abstract

Catalytic diesel particulate filter is an efficient equipment for particulate matters control downstream of a diesel engine. MnO_x–CeO₂ mixed oxides are a potential alternative of the high cost commercial platinum catalyst. However, the poor thermal stability and sulfur resistance are two issues challenging its application. Additionally, the mechanism of synergistic effect between manganese oxide and ceria still remained debatable. Here, the catalysis mechanisms in the presence/absence of NO_x were reviewed. The origins of synergistic effects were discussed based on whether the solid solutions formed or not. Meanwhile, different kinds of metal modifications were summarized and their promotion influences on the thermal stability and sulfur resistance were clarified in detail.

Graphical Abstract

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摘要

催化柴油机微粒过滤器是控制柴油机下游微粒物质的有效设备。MnO _x -CeO ₂混合氧化物是高成本商业铂催化剂的潜在替代品。然而，差的热稳定性和抗硫性是挑战其应用的两个问题。另外，氧化锰与二氧化铈之间的协同作用机理仍然存在争议。此处，存在/不存在NO _x的催化机理被审查。基于是否形成固溶体来讨论协同作用的起源。同时，总结了各种金属改性剂，并详细阐明了它们对热稳定性和耐硫性的促进作用。

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