Synergistic catalytic removals of NO,CO and HC over CeO_2 modified Mn-Mo-W-O_x/TiO_2-SiO_2 catalyst

查看全文 作　　者：Qijie [1]Jin;Yuesong [1]Shen;Guorong [1]Sui;Xingjun [1]Tao;Youchun [1]Pan;Shemin [1]Zhu

机构地区：[1]Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, College of Materials Science and Engineering, Nanjing Tech University

出　　处：《Journal of Rare Earths》索引2018年第36卷第2期,共8页

基　　金：Project supported by the National Key Research and Development Program of China(2016YFC0205500);National Natural Science Foundation of China(51772149);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD) 摘　　要：A series of Mn-Mo-W-O_x/TiO_2-SiO_2 catalysts was modified with CeO_2 using an extrusion molding method. The catalytic activities of the obtained catalysts were tested for the synergistic catalytic removals of CO, NO and C_3H_8. The ratio of catalyst composition on catalytic activities for NH_3-SCR was optimized, which reveals that the molar ratio of Ti/Si was 9:1 and the catalyst containing 1.5 wt% CeO_2 and 12 wt% Mn-Mo-W-O_x exhibits the best catalytic performances. These samples were characterized by XRD, N_2-BET, Py-IR, NH_3-TPD, SEM/element mapping, H_2-TPR and XPS, respectively. Results show that the optimal catalyst exhibits more than 99% NO conversion, 86% CO conversion and 100% C_3H_8 conversion under GHSV of 5000 h^(-1). In addition, the GHSV has little influence on removal of NO when it is less than 15,000 h^(-1). Furthermore, the addition of CeO_2 will enhance the surface acidity, increase Mn^(4+)concentration and inhibit the grain growth, which are favorable for the excellent catalytic performance.Anyway,the 1.5 wt% CeO_2-12 wt% Mn-Mo-W-O_x/TiO_2-SiO_2 possesses outstanding redox properties,abundant acid sites and high Mn^(4+) concentration, which provide a guarantee for synergistic catalytic removal of CO, NO and HC. 关键词：催化剂移动 CEO2 HC 修改氧化还原作用催化活动 XRD

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Synergistic catalytic removals of NO,CO and HC over CeO_2 modified Mn-Mo-W-O_x/TiO_2-SiO_2 catalyst

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