化工进展 ›› 2018, Vol. 37 ›› Issue (10): 3858-3866.DOI: 10.16085/j.issn.1000-6613.2017-2281

• 工业催化 • 上一篇    下一篇

铜系低温选择性催化还原脱硝催化剂的研究进展

张巍1,2,3, 卢程1,2,3, 董鹏飞1,2,3, 尹艳山1,2,3, 方毅伟1,2,3, 邹济遥1,2,3, 胡章茂1,2,3, 阮敏1,2,3, 徐慧芳1,2,3   

  1. 1 长沙理工大学能源与动力工程学院, 湖南 长沙 410114;
    2 可再生能源电力技术湖南省重点实验室, 湖南 长沙 410114;
    3 清洁能源与智能电网湖南省 2011 协同创新中心, 湖南 长沙 410114
  • 收稿日期:2017-11-06 修回日期:2018-03-21 出版日期:2018-10-05 发布日期:2018-10-05
  • 通讯作者: 张巍(1974-),男,讲师,硕士生导师,研究方向为燃烧过程与污染物控制。
  • 作者简介:张巍(1974-),男,讲师,硕士生导师,研究方向为燃烧过程与污染物控制。E-mail:weizhang@csust.edu.cn。
  • 基金资助:
    湖南省自然科学基金(13JJ6045)、湖南省教育厅科学研究项目(13C1014)及污染控制与资源化研究国家重点实验室开放基金项目(PCRRF14018)。

Research progress of copper based low temperature SCR denitration catalysts

ZHANG Wei1,2,3, LU Cheng1,2,3, DONG Pengfei1,2,3, YIN Yanshan1,2,3, FANG Yiwei1,2,3, ZOU Jiyao1,2,3, HU Zhangmao1,2,3, RUAN Min1,2,3, XU Huifang1,2,3   

  1. 1 School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China;
    2 Key Laboratory of Renewable Energy and Electric Power Technology of Hunan Province, Changsha 410114, Hunan, China;
    3 Hunan Province 2011 Collarative Innovation Center of Clean Energy and Smart Grid, Changsha 410114, Hunan, China
  • Received:2017-11-06 Revised:2018-03-21 Online:2018-10-05 Published:2018-10-05

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NOx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

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 NOx (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

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn