环境工程学报2025，Vol.19Issue(2)：491-499,9.DOI:10.12030/j.cjee.202411106
SCR气氛条件下Ce基催化剂汞氧化性能与机制
Mercury oxidation performance and mechanism of Ce-based catalyst under SCR flue gas
摘要
Abstract
Coal-fired power plants and industrial boilers are the largest sources of atmospheric mercury emission in China.Multi pollution synergistic control measures are adopted to reduce flue gas mercury emission in coal-fired industries.The key of synergistic control technology is to oxidizing Hg0 to Hg2+through synergistical denitrification and mercury removal catalyst(SCR catalyst),and be captured by the wet desulfurization technology.In view of the low mercury oxidation efficiency and poor sulfur resistance of Ce-based SCR catalysts,three Ce-based catalysts of Ce5Ti,Ce5W9Ti and Cu5Ce5W9Ti were prepared by the impregnation method with CeO2 as the active site,TiO2 as the carrier,and WO3 and CuO as the modifying agent.The mercury oxidation efficiency of various catalysts were investigated at different flue gas components.Ce5Ti and Ce5W9Ti catalysts showed higher mercury oxidation efficiency(58.4％～69.1％and 68.8％～81.3％,respectively)in the middle temperature range(250～400℃),but lower mercury oxidation efficiency(lower than 53.1％and 62.5％)in the low temperature range(100～200 ℃).CuO doping improved the mercury oxidation efficiency(76.3％～85.5％)of Cu5Ce5W9Ti catalyst in the low temperature range(100～200℃);WO3 doping increased the mercury efficiency of Ce5W9Ti catalyst to 62.4％under SCR flue gas component.The mercury oxidation efficiencies of Cu5Ce5W9Ti in SCR and SCR+SO2 flue gases increased to 81.3％and 78.8％,respectively.The introduction of CuO and WO3 to Cu5Ce5W9Ti catalyst led to form strong and weak alkaline multi-reactive zones on its surface,separate NH3,SO2 and Hg0 adsorption zones,reduce their competitive adsorption and improve the Hg0 oxidation capacity and sulfur resistance of catalysts.This study provides key technical theories for the mercury emission reduction of multi-pollution synergistic control measures.关键词
催化剂/CeO2/汞氧化/酸碱性/协同控制Key words
catalysts/CeO2/mercury oxidation/acid-base property/synergistic control分类
资源环境引用本文复制引用
张庚,陈兴,李昂,李国良,何川,吴迅,唐荣富,兰小洪,张丹平,赵丽娟,吴国勋,李乐田..SCR气氛条件下Ce基催化剂汞氧化性能与机制[J].环境工程学报,2025,19(2):491-499,9.基金项目
华能集团科技项目(HNKJ23-H39) （HNKJ23-H39）
国家自然科学青年基金资助项目(52200121) （52200121）
