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柴油车尾气中的氮氧化物日益危及人类健康和生态环境。Cu-SSZ-13分子筛脱硝催化剂因宽的温度窗口、优异的水热稳定性等性能而受到广泛关注。为了适应更为严格的氮氧化物排放标准,进一步提高Cu-SSZ-13分子筛催化剂的NH_3-SCR反应性能,深入研究Cu-SSZ-13分子筛催化剂物理化学性能及其对NH_3-SCR脱硝反应机理影响十分必要。介绍了近年来Cu-SSZ-13分子筛催化剂及其NH_3-SCR脱硝机理的研究进展。详细论述了Cu-SSZ-13分子筛催化剂在NH_3-SCR反应过程中的活性铜物种及其变化,并对不同Cu-SSZ-13分子筛催化剂的制备方法进行了比较。提出Cu-SSZ-13分子筛催化剂NH_3-SCR脱硝技术研究中SO_2气氛和理论与实验的结合需要进一步研究。
Nitrogen oxides in diesel exhaust are increasingly endangering human health and the environment. Cu-SSZ-13 molecular sieve denitration catalyst due to the wide temperature window, excellent hydrothermal stability and other properties have received widespread attention. In order to meet the more stringent nitrogen oxide emission standards, further improve the NH_3-SCR reaction performance of Cu-SSZ-13 zeolite catalyst, in-depth study of the physical and chemical properties of Cu-SSZ-13 zeolite catalyst and its impact on the NH_3-SCR denitration reaction mechanism Very necessary. The research progress of Cu-SSZ-13 molecular sieve catalyst and its NH3-SCR denitration mechanism are introduced in recent years. The active copper species and its variation during the reaction of NH_3-SCR with Cu-SSZ-13 zeolite catalyst were discussed in detail. The preparation methods of Cu-SSZ-13 zeolite catalysts were compared. It is proposed that the combination of theory and experiment needs to be further studied in the SO_2 atmosphere in the study of NH_3-SCR denitrification technology of Cu-SSZ-13 zeolite catalysts.