Cu对Fe基催化剂NH_(3)-SCR性能助力作用研究  

Promotion effect study of Cu on NH_(3)-SCR performance of Fe-based catalysts

作　　者：龚蕾 董世城 胡容赫 曲振平[1] 王辉 GONG Lei;DONG Shicheng;HU Ronghe;QU Zhenping;WANG Hui(School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学环境学院,辽宁大连116024

出　　处：《大连理工大学学报》2024年第5期447-454,共8页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(21806017,21876019).

摘　　要：Fe基催化剂在中温范围有着良好的催化活性,而Cu基催化剂有着低温优势,因此将两者相结合,采用表面活性剂辅助法制备了Fe-Cu复合氧化物.引入Cu后,Fe-Cu催化剂的NO x转化率达90%,起燃温度下降至150℃.Fe_(2)O_(3)和CuO之间的相互作用使得催化剂的比表面积增大约1/4,且增强了Fe^(3+)的亲电性,促进NO_(2)等电负性物质的吸附.同时提高了催化剂的氧化还原能力与表面吸附氧Oα比例,NO更易向NO_(2)转变,快速SCR(选择性催化还原)进程更易发生.此外,Fe_(2)O_(3)和CuO的相互作用让催化剂拥有较多的酸性位点,有利于催化活性的提升.最终使得Fe-Cu催化剂不仅继承了Cu基催化剂的低温优势,还保持了优良的N_(2)选择性.Fe-based catalysts exhibit good catalytic activity in the medium temperature range,while Cu-based catalysts have an advantage at low temperatures.Therefore,both elements are combined,and a surfactant-assisted method is used to prepare Fe-Cu composite oxide.After the introduction of Cu,the NO x conversion rate by Fe-Cu catalyst reaches 90%,and the ignition temperature drops to 150℃.The interaction between Fe_(2)O_(3)and CuO expands the specific surface area of the catalyst by approximately 1/4 and enhances the electrophilicity of Fe^(3+),promoting the adsorption of electronegative substances such as NO_(2).Simultaneously,it improves the redox ability of the catalyst and increases the proportion of surface adsorbed oxygen Oα,facilitating the conversion of NO to NO_(2),and thus the occurrence of the fast SCR(selective catalytic reduction)process.Additionally,the interaction between Fe_(2)O_(3)and CuO endows the catalyst with more acidic sites,which is beneficial for enhancing catalytic activity.Ultimately,the Fe-Cu catalyst not only inherits the low-temperature advantages of Cu-based catalyst but also maintains excellent N_(2)selectivity.

关 键 词：Fe-Cu复合氧化物 NH_(3)-SCR 相互作用 催化剂 

分 类 号：X51[环境科学与工程—环境工程]