Research progress of copper based low temperature SCR denitration catalysts

doi:10.16085/j.issn.1000-6613.2017-2281

Abstract

Abstract: Selective catalytic reduction (SCR) technology has been widely used for flue gas denitrification in coal-fired power plants and the development of catalyst system with high activity at low temperature and high resistance to poisoning has become the key. Cu based catalysts have gained a wide range of research and attention because of its good denitrification performance and hydrothermal stability. In this paper, the recent progress in the studies on Cu loading on supports such as TiO₂, Al₂O₃, carbon-based materials and molecular sieves is reviewed. The mechanism of low temperature SCR reaction with Cu based catalyst is analyzed emphatically. There are two processes in the SCR denitrification reaction:adsorption and reaction. The adsorption process includes the NH₃ adsorption and the NO_x (NO and NO₂ adsorption. The mechanisms of Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) are used for the denitration catalyst. The research status and reaction mechanism of Cu-based catalysts for water and sulfur resistance are briefly introduced. The effects of alkali metal poisoning, fly ash and catalyst sintering on catalyst deactivation are also introduced. Using the life cycle analysis(LCA) of SCR denitrification system, we also investigate the effect of ammonia and urea on NO emissions. Finally, the research direction for the copper based catalysts is prospected. The catalyst should be modified by new methods, and the reaction mechanism of the catalytic system, the optimization of the boiler and the catalyst design should be studied by using the characterization and simulation techniques to reduce the deactivation of the catalyst and to study highly selective catalysts for other reducing conditions.

Key words: selective catalytic reduction, catalyst support, adsorption, reaction, deactivation

摘要： 选择性催化还原（SCR）技术已广泛应用在燃煤电站烟气脱硝技术中，开发低温高活性、高抗中毒性能的催化剂体系已经成为国内外学者的研究重点。Cu系催化剂由于具有良好的脱硝性能及水热稳定性，得到了广泛的研究和关注。本文综述了近年来活性组分Cu负载在TiO₂、Al₂O₃、碳基材料和分子筛等材料上的研究进展；重点分析了Cu系催化剂低温SCR反应机理，主要包括Eley-Rideal （E-R）机理和Langmuir-Hinshelwood （L-H）机理，同时分析了SCR反应的两个必然过程：吸附（NH₃吸附和NO_x吸附）和反应；简要地介绍了Cu系催化剂的抗水抗硫中毒性能研究现状以及反应机理，同时介绍了碱金属中毒、飞灰和催化剂烧结对催化剂失活的影响，结合生命周期分析SCR脱硝系统还原剂氨和尿素对NO排放的影响。在此基础上展望了未来铜系催化剂的研究方向：采用新型方式对催化剂进行改性、进一步采用表征和模拟技术研究催化体系的反应机理、优化锅炉和催化剂设计减轻催化剂失活以及研究适用于其他还原剂条件的高选择性催化剂。

关键词: 选择性催化还原, 催化剂载体, 吸附, 反应, 失活

CLC Number:

X511
TQ-9

ZHANG Wei, LU Cheng, DONG Pengfei, YIN Yanshan, FANG Yiwei, ZOU Jiyao, HU Zhangmao, RUAN Min, XU Huifang. Research progress of copper based low temperature SCR denitration catalysts[J]. Chemical Industry and Engineering Progress, 2018, 37(10): 3858-3866.

张巍, 卢程, 董鹏飞, 尹艳山, 方毅伟, 邹济遥, 胡章茂, 阮敏, 徐慧芳. 铜系低温选择性催化还原脱硝催化剂的研究进展[J]. 化工进展, 2018, 37(10): 3858-3866.

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