Zeolites, as efficient and stable catalysts, are widely used in the environmental catalysis field. Typically, Cu-SSZ-13 with small-pore structure shows excellent catalytic activity for selective catalytic reduction of NOx with ammonia (NH3-SCR) as well as high hydrothermal stability. This review summarizes major advances in Cu-SSZ-13 applied to the NH3-SCR reaction, including the state of copper species, standard and fast SCR reaction mechanism, hydrothermal deactivation mechanism, poisoning resistance and synthetic methodology. The review gives a valuable summary of new insights into the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts, highlighting the significant opportunity presented by zeolite-based catalysts. Principles for designing zeolites with excellent NH3-SCR performance and hydrothermal stability are proposed. On the basis of these principles, more hydrothermally stable Cu-AEI and Cu-LTA zeolites are elaborated as well as other alternative zeolites applied to NH3-SCR. Finally, we call attention to the challenges facing Cu-based small-pore zeolites that still need to be addressed.

中文翻译：

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NH3选择性催化还原NOx：铜基小孔沸石的机遇与挑战

沸石作为高效稳定的催化剂，广泛应用于环境催化领域。通常，具有小孔结构的 Cu-SSZ-13 具有优异的氨选择性催化还原 NOx (NH3-SCR) 的催化活性以及高的水热稳定性。本综述总结了Cu-SSZ-13应用于NH3-SCR反应的主要进展，包括铜物种状态、标准和快速SCR反应机理、水热失活机理、抗毒性和合成方法学。该综述对 SCR 催化剂设计原理与 Cu2+ 交换沸石催化剂特性之间的匹配新见解进行了有价值的总结，突出了沸石基催化剂带来的重大机遇。提出了设计具有优异 NH3-SCR 性能和水热稳定性的沸石的原则。在这些原理的基础上，阐述了水热稳定性更高的 Cu-AEI 和 Cu-LTA 沸石以及应用于 NH3-SCR 的其他替代沸石。最后，我们提请注意铜基小孔沸石面临的仍需解决的挑战。