独居石负载钼氧化物催化材料制备及其NH3-SCR脱硝性能研究  

Study on Preparation and NH3-SCR Denitration Performance of Molybdenum Oxide-Loaded Monazite Catalytic Materials

作　　者：王莹 赵然 张凯[1] 武文斐[1] WANG Ying;ZHAO Ran;ZHANG Kai;WU Wen-fei(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Materials and Metallurgy,Inner Mongolia University ofScience and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《稀有金属与硬质合金》2023年第1期40-46,共7页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金项目(51964039,22068029);稀土资源国家重点实验室项目(RERU2021010);内蒙古自然科学基金项目(2021LHMS02003,2019MS02005,2019MS05050)。

摘　　要：使用浸渍法制备独居石负载钼氧化物的催化剂,并对其进行表征和NH_(3)-SCR脱硝性能测试。结果表明,当脱硝反应温度为400℃时,Mo/Ce物质的量之比为0.3的复合催化剂的NO转化率达到75%。独居石增大了催化剂的比表面积;负载金属氧化物均匀分散在独居石表面,形成了Ce^(3+)/Ce^(4+)、Mo^(5+)/Mo^(6+)共存的状态,能促进电子转移,生成氧空位和不饱和化学键,有利于独居石表面活性位点的增多。相对于纯独居石,复合催化剂的氧化还原能力和NH_(3)的脱附活化能力均有所提升,但主要集中在高温范围内,低温段脱硝效率提升相对较小。The catalyst of molybdenum oxide-loaded monazite was prepared by impregnation method,and tests for its characterization and NH_(3)-SCR denitration performance were carried out.The results show that the NO conversion rate of the composite catalyst with Mo/Ce molar ratio of 0.3 reaches 75%at the denitration reaction temperature of 400℃.Monazite increases the specific surface area of the catalyst.The loaded metal oxides are uniformly dispersed on the monazite surface,resulting in the coexistence of Ce^(3+)/Ce^(4+)and Mo^(5+)/Mo^(6+)and promoting electron transfer to generate oxygen vacancy and unsaturated chemical bonds,which is in favor of the increase of the active site on the monazite surface.Compared with pure monazite,the redox property and the adsorption and activation capacity of NH_(3)of the composite catalyst have been improved mainly in the high temperature range,with a relatively small improvement in the denitration efficiency in the low temperature section.

关 键 词：复合催化剂 独居石 钼氧化物 脱硝性能 Mo^(5+)/Mo^(6+)共存 Ce^(3+)/Ce^(4+)共存 

分 类 号：TD983[矿业工程—选矿]