用于HC-SCR还原NO x 的Cu基分子筛催化剂研究进展

doi:10.16085/j.issn.1000-6613.2022-0931

摘要/Abstract

摘要：

烃类化合物选择性催化还原（HC-SCR）是一种有效的脱硝技术，但是在较低温度下Cu基分子筛催化剂用于HC-SCR催化还原NO _x 存在催化活性较低、活性温度窗口较窄的问题。本文针对铜/分子筛催化剂选择催化还原NO _x 的研究进展，系统介绍了负载型Cu基分子筛催化剂在HC-SCR应用中的反应机理以及载体、负载Cu含量、制备工艺、还原剂、H₂O和SO₂对催化活性的影响。发现掺杂与铜产生协同作用的金属助剂有助于提高低温催化活性。最后提出了制备具有优异低温催化活性的HC-SCR铜基分子筛催化剂的策略和今后开发高效性能催化剂的研究方向，例如适当增加Cu负载量、控制Si/Al比以及进一步提高金属活性组分的分散性。

关键词: 烃类化合物, 选择催化还原, 分子筛, 催化剂, 低温, 优化

Abstract:

Selective catalytic reduction of hydrocarbons (HC-SCR) is an effective denitrification technology, but the Cu-based molecular sieve catalysts used for catalytic reduction of NO _x by HC-SCR have problems of low catalytic activity and narrow active temperature windows at low temperatures. This work reviews the progress of selective catalytic reduction of NO _x by Cu/zeolite catalysts. In addition, the reaction mechanism of supported Cu-based zeolite catalysts in the application of HC-SCR and the effects of support, supported Cu content, preparation process, reducing agent, H₂O, and SO₂ on the catalytic activity are systematically presented. It is found that doping metal additives that worked synergistically with copper could improve the low-temperature catalytic activity. Finally, the preparation strategy of Cu-based zeolite catalysts with excellent low-temperature catalytic activity and future research directions for developing high-efficiency catalysts, such as appropriately increasing the Cu loading, controlling the Si/Al ratio, and further improving the dispersion of active metal components, are proposed, which could provide a theoretical basis and guide for the optimization and development of novel Cu-based zeolite catalysts with high efficiency at low temperature.

Key words: hydrocarbons, selective catalytic reduction, molecular sieves, catalysts, low temperature, optimization

中图分类号:

O643.36

宁淑英, 苏亚欣, 杨洪海, 温妮妮. 用于HC-SCR还原NO _x 的Cu基分子筛催化剂研究进展[J]. 化工进展, 2023, 42(3): 1308-1320.

NING Shuying, SU Yaxin, YANG Honghai, WEN Nini. Research progress on supported Cu-based zeolite catalysts for the selective catalytic reduction of NO _x with hydrocarbons[J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1308-1320.

图/表 10

图1 Cu-SAPO-34表征图[34]

图2 Cu-TNU-9和Cu-Y分子筛在298K时的NMR谱图[28]

图3 380℃下Cu-SSZ-13催化剂上C3H6-SCR的DRIFTS谱图[47]

(17)

图4 Cu-SSZ-13的结构和H2-TPR图

图5 催化剂的NO解吸和NO转化率

图6 Cu-SAPO‐34的SEM图像[72]

图7 H2O对C3H8-SCR-NO在不同Cu基催化剂上反应的影响[31]

图8 不同SAPO沸石催化剂负载Cu的SCR活性[19]

图9 2%Ag/Al2O3和5%Cu/ZSM-5催化剂上的NO x 转化率随时间的变化[101]

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