NH_(3)选择性催化还原NO_(x)的铜基小孔分子筛耐硫性能及再生研究  

Performance of Resistance to Sulfur Oxide and Regeneration over Copper-Based Small-Pore Zeolites Catalysts for the Selective Catalytic Reduction of NO_(x)with NH_(3)

作　　者：李帅 朱娜 程扬健[1] 陈缔 Shuai Li;Na Zhu;Yangjian Cheng;Di Chen(School of Advanced Manufacturing,Fuzhou University,Jinjiang 362251,China;Foshan(Southern China)Institute for New Materials,Foshan 528247,China)

机构地区：[1]福州大学先进制造学院,晋江362251 [2]佛山(华南)新材料研究院,佛山528247

出　　处：《化学进展》2023年第5期771-779,共9页Progress in Chemistry

基　　金：福建省自然科学基金青创项目(No.2021J05138);佛山(华南)新材料研究院开放青年基金项目(No.2021AYF25001)资助。

摘　　要：铜基小孔分子筛催化剂因其具有优异的氨气选择性催化还原氮氧化物(NH_(3)-SCR)活性、水热稳定性、氮气选择性和较宽的温度窗口等特点,成为当前国六标准柴油车的首选催化剂。但是,柴油车尾气中的硫氧化物对铜基小孔分子筛催化剂的催化活性影响很大,甚至导致催化剂发生不可逆失活。本文以铜基小孔分子筛催化剂的硫中毒机理为主线,简要介绍了铜基小孔分子筛催化剂的结构及活性位点研究现状,进一步对催化剂耐硫性能的改进及硫中毒催化剂再生机理的研究进展进行综述。基于铜基小孔分子筛催化剂硫中毒机理研究开展耐硫性能改进及再生工艺研究,以及多种中毒因子的协同影响及失活机制研究是未来铜基小孔分子筛实际应用于柴油车尾气氮氧化物超低排放的重要研究方向。Copper-based small-pore zeolites catalysts are the promising candidate catalysts for NO,abatement in current diesel vehicles with Chinese VI standards,due to the excellent NH,-SCR catalytic performance,hydrothermal stability,nitrogen selectivity and wide temperature window.However,the catalytic activity of copper-based small-pore zeolites is still significantly affected by sulfur oxides emitted from diesel vehicles,and even the irreversible deactivation occurs.The SO_(2)-poisoning of Cu-based small-zeolites is mainly due to the accumulation of surface ammonium sulfate and sulfation of Cu active site sites.In this review,the research status of the structure and active sites of copper-based small-pore zeolites catalysts is summarized,and the sulfur poisoning mechanism of copper-based small-pore zeolites catalysts is discussed.Moreover,the research advance in the improvement of sulfur resistance of catalysts and the regeneration of sulfur-poisoned catalysts is also illustrated.The systematic understanding of mechanism of sulfur poisoning and regeneration is important for the design of novel,efficient catalyst.It is pointed out that the study on sulfur poisoning mechanism and regeneration mechanism of copper-based small-pore zeolites catalysts,as well as the synergistic effect of various poisoning factors and corresponding deactivation mechanism,are the main research directions for copper-based zeolites to be practically applied to ultra-low emission of nitrogen oxides in diesel vehicle exhaust in the future.

关 键 词：氮氧化物 铜基小孔分子筛 选择性催化还原 硫中毒 再生 

分 类 号：O643.3[理学—物理化学]