过渡金属改性Ce-M-O_(x)(M=Cu,Co,Mn和Fe)催化剂在NH_(3)-SCR反应研究  

Study on Transition-Metal-Modified Ce-M-O_(x)(M=Cu,Co,Mn,and Fe)Catalysts in the NH_(3)-SCR Reaction

作　　者：刘春宇 宋忠贤 张学军 刘威 莫杜娟 刘泽鹏 李海洋 LIU Chun-yu;SONG Zhong-xian;ZHANG Xue-jun;LIU Wei;MO Du-juan;LIU Ze-peng;LI Hai-yang(School of Environmental and Safety Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;School of Municipal and Environmental Engineering,Henan University of Urban Construction,Pingdingshan 467036,China)

机构地区：[1]沈阳化工大学环境与安全工程学院,辽宁沈阳110142 [2]河南城建学院市政与环境工程学院,河南平顶山467036

出　　处：《化学试剂》2023年第3期53-60,共8页Chemical Reagents

基　　金：国家自然科学基金项目(21872096);河南省自然科学青年基金项目(202300410034);河南城建学院学术带头人项目(YCJXSJSDTR202204);平顶山市2021年重大科技专项项目(2021ZD03)。

摘　　要：采用共沉淀法制备了CeO_(2)上负载不同过渡金属元素Ce-M(M=Fe、Mn、Cu、Co)催化剂,研究了不同金属负载对CeO_(2)基催化剂脱硝活性影响。CeO_(2)催化剂中加入适量的过渡金属可降低催化剂结晶度,提高催化剂的氧化还原性和表面酸性,从而影响催化剂在NH_(3)-SCR中的催化性能。Ce-Fe、Ce-Mn催化剂中Fe^(3+)和Mn^(3+)的大量存在可提高催化剂的Lewis和Brφnsted酸性位点,提升催化剂对NH_(3)的吸附与活化性能,从而提升其催化性能。Ce-Mn催化剂具有优越的低温活性,Ce-Fe展现了较好的中高温活性,这与其催化剂的表面酸性密切相关。Catalysts loaded with different transition metals Ce-M(M=Fe,Mn,Cu and Co)on CeO_(2)were prepared by co-precipitation method.The effects of different metal loads on the denitrification activity of CeO_(2)based catalysts were studied.Adding proper amount of transition metal to CeO_(2)catalyst could reduce the crystallinity of the catalyst,improve the oxidation reducibility and surface acidity of the catalyst,and thus affected the catalytic performance of the catalyst in NH_(3)-SCR.The presence of Fe^(3+)and Mn^(3+)in Ce-Fe and Ce-Mn catalysts could improve the Lewis and Br nsted acid sites of the catalysts,improve the adsorption and activation properties of NH_(3),and thus improved the catalytic performance.Ce-Mn catalyst has superior activity at low temperature,and Ce-Fe exhibited better activity at middle and high temperature,which was closely related to the surface acidity of the catalyst.

关 键 词：氮氧化物 选择性催化还原 过渡金属元素 表面物种 表面酸度 

分 类 号：X511[环境科学与工程—环境工程]