协同脱除燃煤电厂烟气中NO和VOCs的SCR催化剂研究进展  

Research progress on SCR catalysts for the synergistic removal of NO andVOCs from coal-fired power plants flue gas:A review

作　　者：陈银 廖艳芬[1,2] 马晓茜[1,2] CHEN Yin;LIAO Yanfen;MA Xiaoqian(School of Electric Power,South China University of Technology,Guangzhou 510640,China;GuangdongProvince Key Laboratory of Efficient and Clean Energy Utilization,Guangzhou 510640,China)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]华南理工大学广东省能源高效清洁利用重点实验室,广东广州510640

出　　处：《能源环境保护》2023年第2期85-97,共13页Energy Environmental Protection

基　　金：国家重点研发计划资助项目(2018YFB0605200)。

摘　　要：燃煤电厂的NO_(x)和VOCs排放量占人为源排放量的近三成,是大气环境治理面临的严峻挑战。在燃煤电厂的SCR区域协同脱除烟气中NO和VOCs,可以有效降低处理成本,具有重要的科学价值和环境效益。本文概述了近年来协同脱除燃煤电厂烟气中NO和VOCs的SCR催化剂的研究进展。当前研究主要采用浸渍法、共沉淀法、水热法、溶胶-凝胶法、模板法等方法制备多功能催化剂,掺杂过渡金属/贵金属或选择合适的载体会明显提高催化剂表面酸性位点数量和表面活性氧浓度,使催化剂协同脱除能力大幅攀升。然而,实际烟气中多种污染物会在催化剂表面相互影响,多种反应物的相互作用机理以及反应条件对协同去除率的影响也被重点讨论。针对当前研究存在的问题和挑战,可利用原位技术和DFT两个有力的工具,探究催化剂协同催化反应路径和失活机理,从而指导设计结构稳定、氧化还原活性好、副产物少、抗毒性强、可再生的协同脱除NO和VOCs的SCR催化剂。当前协同脱除NO和VOCs的研究还停留在实验室规模,未来要完善多污染物协同控制理论,实现复杂烟气中NO_(x)和VOCs协同脱除的实际工程应用。NO_(x) and VOCs emissions from coal-fired power plants account for roughly 30%of anthropogenic emissions and provide a severe challenge to air quality protection.Synergistic NO and VOCs removal from coal-fired power plants flue gas in the SCR zone can efficiently cut treatment costs,which needs scientific investigation and is of environmental benefits.This review describes the latest research development of SCR catalysts for the synergistic removal of NO and VOCs from coal-fired power plant flue gas.Currently,the studies are mainly associated with impregnation method,co-precipitation method,hydrothermal method,sol-gel method,template method and other ways to prepare multifunctional catalysts.Doping with transition metals/nobel metals or selecting appropriate carriers will dramatically increase the amounts of acidic sites and reactive oxygen species on the surface,resulting in a rapid rise in synergistic removal capacity.However,multiple pollutants in the actual flue gas will interact on the catalyst surface.The interaction mechanism of multiple reactants and the effect of reaction conditions on the synergistic removal rate have also been focused on.To address the problems and challenges of current research,two powerful tools,in situ technology and DFT,can be applied to explore the synergistic catalytic reaction pathways and deactivation mechanisms,guiding the design of SCR catalysts with good redox activity,low by-products,high resistance to toxicity and regeneration.Current research on synergistic NO and VOCs elimination is mainly conducted in the laboratory.In the future,the theory of multi-pollutant synergistic control should be improved to realize the practical engineering applications for the synergistic removal of NO_(x) and VOCs from complex flue gases.

关 键 词：氮氧化物 挥发性有机物 协同脱除 SCR催化剂 

分 类 号：X701[环境科学与工程—环境工程]