菱沸石在柴油车尾气NO_x催化净化中的应用

发布时间：2018-03-24 08:07

本文选题：NO_x控制　切入点：NH_选择性催化还原　出处：《化学进展》2016年12期

【摘要】：柴油车尾气NO_x控制是目前大气污染控制领域的重要研究内容,对改善城市大气污染现状有着极其重要的作用。NH_3选择性催化还原NO_x(NH_3-SCR)是应用于该领域的主流技术之一。近年来,以具有菱沸石(chabazite,CHA)结构的分子筛为载体负载Cu制备的Cu-CHA(Cu-SSZ-13和Cu-SAPO-34)系列催化剂,因其优秀的NH_3-SCR活性和良好的水热稳定性,成为学者们关注的热点。本文首先从制备方法及反应条件对Cu-CHA催化性能的影响和NH_3-SCR反应机理这几个方面系统阐述Cu基菱沸石在柴油车尾气NO_x催化净化领域的研究进展;然后总结了负载其他过渡金属和稀土金属制备的M-CHA分子筛催化剂在NH_3-SCR反应中的应用,指出双活性中心菱沸石催化剂在NH_3-SCR领域表现出的优势;在此基础上对菱沸石NH_3-SCR催化剂的进一步改良做出展望。
[Abstract]:The NO_x control of diesel exhaust gas is an important research content in the field of air pollution control at present. It plays an extremely important role in improving the present situation of urban air pollution. The selective catalytic reduction of no _ x and NH _ 3-SCR by NH _ S _ 3 is one of the mainstream technologies applied in this field in recent years. The Cu-CHA(Cu-SSZ-13 and Cu-SAPO-34 catalysts prepared by Cu supported on molecular sieves with rhombohedral chabazite chabaziteCha) structure have excellent NH_3-SCR activity and good hydrothermal stability. Firstly, the effect of preparation methods and reaction conditions on the catalytic performance of Cu-CHA and the mechanism of NH_3-SCR reaction are reviewed systematically in this paper. The research progress of Cu-based rhombohedral zeolite in the field of catalytic purification of diesel vehicle tail gas NO_x is systematically described in this paper. Then the application of M-CHA zeolite catalysts supported on other transition metals and rare earth metals in NH_3-SCR reaction was summarized, and the advantages of double active center rhombohedral catalysts in the field of NH_3-SCR were pointed out. On this basis, the further improvement of rhombohedral NH_3-SCR catalyst is prospected.
【作者单位】：江南大学环境与土木工程学院;江苏省厌氧生物技术重点实验室;中国科学院生态环境研究中心;中国科学院大学;
【基金】：国家自然科学基金项目(No.51508231,51278486) 中央高校基本科研业务费专项资金(JUSRP11524)资助~~
【分类号】：X734.2;O643.36

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