Recent Progress in Novel Zeolite Catalysts for Selective Catalytic Reduction of Nitrogen Oxides
Recent Progress in Novel Zeolite Catalysts for Selective Catalytic Reduction of Nitrogen Oxides
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DOI：
10.1016/j.cattod.2023.114212
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发表时间：
2023-05
期刊：
影响因子：
5.3
通讯作者：
Anqi Guo;Huibin Liu;Yating Li;Yuehan Luo;D. Ye;Jiuxing Jiang;Peirong Chen
中科院分区：
文献类型：
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作者：
Anqi Guo;Huibin Liu;Yating Li;Yuehan Luo;D. Ye;Jiuxing Jiang;Peirong Chen
沸石催化剂选择性催化还原（SCR）是稀燃重型汽车氮氧化物（NOx）减排的关键技术。随着排放法规的日益严格，研究人员正在致力于提高沸石催化剂的效率和耐久性。本文综述了近年来新型分子筛SCR催化剂的研究进展。具体而言，我们首先提供了一个详细的概述的合成，结构与性能的关系，和潜在的应用具有不同的拓扑结构的小孔沸石（CHA，AEI，LTA，AFX，SFW，KFI，ERI/EAB，LEV和RHO）作为催化剂在SCR与NH3作为还原剂。综述了合成后改性的NH3-SCR催化剂的研究进展，并介绍了无铜的NH3-SCR催化剂。我们还总结了最近的NH3-SCR化学在小孔沸石催化剂，主要是在Cu-SSZ-13，使用situoroperandoscopics的机制的理解。沸石作为催化剂在使用烃（例如，CH_4、CH_3OH）或H_2作还原剂的情况也作了简要讨论。最后，我们讨论了几种新型的小孔沸石，如Cu-SSZ-39，在NH3-SCR中的真实的应用和新的SCR系统的开发，最大限度地减少副产物的形成，如温室气体N2 O和有毒的HCN的潜力。
Selective catalytic reduction (SCR) using zeolite catalysts is a key technology for the abatement of nitrogen oxides (NOx) from lean-burn heavy-duty vehicles. With the increasing stringency of emission regulations, researchers are now devoting more efforts to enhancing the efficiency and durability of zeolite catalysts. This paper intends to summarize the very recent (mainly in the last five years) advancements in the development and application of novel zeolites as SCR catalysts. Specifically, we first provide a detailed overview of the synthesis, structure-performance relationship, and potential application of small-pore zeolites with different topologies (CHA, AEI, LTA, AFX, SFW, KFI, ERI/EAB, LEV and RHO) as catalysts in SCR with NH3as the reductant. Then, advances in the post-synthetic modifications of small-pore zeolites for NH3-SCR are reviewed, followed by an introduction of Cu-free small-pore zeolites as NH3-SCR catalysts. We also summarize the recent mechanistic understandings of NH3-SCR chemistry over small-pore zeolite catalysts, mainly over Cu-SSZ-13, usingin situoroperandospectroscopy. The application of zeolites as catalysts in SCR with hydrocarbons (e.g.,CH4, CH3OH) or H2as the reductant is also briefly discussed. Finally, we discuss the potential of several novel small-pore zeolites, such as Cu-SSZ-39, for real application in NH3-SCR and the development of new SCR systems with minimized formation of byproducts, such as the greenhouse gas N2O and the toxic HCN.