摘要
大气中氮氧化物(NO_(x))的浓度超过环境的自净能力会导致酸雨、光化学烟雾、臭氧层的破坏和富营养化等环境问题。且大气中的氮氧化物会参与空气污染物PM_(2.5)和O_(3)的形成,严重危害人类健康,破坏陆地生态系统和水生生态系统。氨选择性催化还原NO_(x)(NH_(3)-SCR)被认为是控制NO_(x)排放的最佳技术之一,该技术的关键是催化剂。介绍了大气污染物NO_(x)的来源、NH_(3)-SCR脱硝反应机理及催化剂的SO_(2)中毒机理,重点总结提高锰铈系催化剂抗硫性能的研究进展,旨在为设计新型抗硫中毒锰铈系低温NH_(3)-SCR催化剂提供科学依据。
When concentration of nitrogen oxides(NO_(x))in the atmosphere exceeds the self-purification capacity of the environment,it will lead to acid rain,photochemical smog,destruction of the ozone layer and eutrophication.In addition,nitrogen oxides in the atmosphere will participate in the formation of air pollutant PM_(2.5)and O_(3),seriously endanger human health and damage terrestrial and aquatic ecosystems.Ammonia selective catalytic reduction of NO_(x)(NH_(3)-SCR)is considered to be one of the best technologies to control NO_(x)emissions from fixed sources,and the key of this technology is catalyst.This paper introduces the sources of the main atmospheric pollutant NO_(x),the mechanism of NH_(3)-SCR denitration reaction and the mechanism of SO_(2)poisoning of the catalyst.It focuses on the research progress of improving the sulfur resistance of Mn-Ce catalyst,aiming to provide scientific basis for the design of a new type of sulfur resistant Mn-Ce catalyst for low-temperature NH_(3)-SCR.
作者
龙璐璐
田时泓
张潇潇
赵永昌
姚小江
Long Lulu;Tian Shihong;Zhang Xiaoxiao;Zhao Yongchang;Yao Xiaojiang(College of Environment and Resources,Chongqing Technology and Business University,Chongqing 400067,China;Research Center for Atmospheric Environment,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;College of Resources and Environment,Chongqing School,University of Chinese Academy of Sciences,Chongqing 400714,China)
出处
《工业催化》
CAS
2023年第8期1-9,共9页
Industrial Catalysis
基金
国家自然科学基金项目(22076180)
重庆市巴渝学者计划(青年学者,YS2020048)。
