富氧条件下金属催化CO还原NO的研究进展

doi:10.16085/j.issn.1000-6613.2018-0080

摘要/Abstract

摘要： CO广泛存在于燃煤烟气及汽车尾气中，利用未完全燃烧的CO催化还原NO可同时脱除NO和CO，过程中催化剂起着决定性作用。本文对近年来含氧条件下CO催化还原NO的研究成果进行了系统梳理，重点关注了Pd系、Ir系、Cu系、其他贵金属及金属氧化物催化剂的研究进展，分析了催化剂制备方法、掺杂改性及反应条件对催化性能的影响，同时考察了O₂浓度、H₂O以及SO₂对催化反应的影响，总结并对比了不同体系催化剂的活性位点及其催化机理，指明了O₂在催化还原过程中的抑制机理，得出了几种体系催化剂催化CO还原NO的活性顺序。最后，针对富氧条件下CO催化还原NO所存在的问题和难点，提出深入研究O₂抑制机理、降低贵金属用量、添加活性助剂是今后的研究方向。

关键词: 一氧化碳, 富氧条件, 烟道气, 一氧化氮催化还原, 催化剂

Abstract: Carbon monoxide is widely present in coal-fired flue gas and automobile exhaust. The catalytic reduction of NO by incompletely-burned CO can simultaneously remove NO and CO. The catalyst plays a decisive role in the process. In this paper, the recent research results of CO catalytic reduction of NO under oxygen are reviewed systematically. The catalyst preparation method, doping modification and reaction conditions of Pd based, Ir based, Cu based, other precious metals and metal oxide catalysts are analyzed. The effects of O₂ concentration, H₂O and SO₂ on the catalytic reaction are also investigated. The active sites and catalytic mechanism of different catalysts are summarized and compared. The inhibition mechanism of O₂ in the catalytic reduction process was proposed, and the catalytic activity sequence of these kinds of catalysts was obtained. Finally, the research directions of further study are given as the inhibition mechanism of O₂, reducing the use of precious metals, and adding active additives.

Key words: carbon monoxide, oxygen enrichment, flue gas, nitric oxide catalytic reduction, catalyst

中图分类号:

张国祥, 陈晓晖. 富氧条件下金属催化CO还原NO的研究进展[J]. 化工进展, 2018, 37(12): 4654-4661.

ZHANG Guoxiang, CHEN Xiaohui. Research progress in metal catalysts for catalytic reduction of NO by CO with excess oxygen[J]. Chemical Industry and Engineering Progress, 2018, 37(12): 4654-4661.

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