NH3-SCR performance and the resistance to SO2 for Nb doped vanadium based catalyst at low temperatures

查看全文 作　　者：Lin [1]Zhu;Zhaoping [1]Zhong;Jianming [2]Xue;Yueyang [2]Xu;Chunhua [3]Wang;Lixia [1]Wang

机构地区：[1]Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;[2]Guodian Science and Technology Research Institute, Nanjing 210031, China;[3]College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

出　　处：《Journal of Environmental Sciences》索引2018年第30卷第3期,共11页

基　　金：supported by the Policy-induced Project of Jiangsu Province for the Industry-University-Research Cooperation (No. BY2015070-21);the project was also supported by National Science and Technology Ministry (No. 2015BAA05B01);the Natural Science Fund Program of Jiangsu Province (No. BK20150749) 摘　　要：Niobium oxide as the promoter was doped in the V/WTi catalyst for the selective catalytic reduction(SCR)of NO.The results showed that the addition of Nb_2O_5could improve the SCR activity at low temperatures and the 6 wt.%additive was an appropriate dosage.The enhanced reaction activity of adsorbed ammonia species and the improved dispersion of vanadium oxide might be the reasons for the elevation of SCR activity at low temperatures.The resistances to SO_2of 3V6Nb/WTi catalyst at different temperatures were investigated.FTIR spectrum and TG-FTIR result indicated that the deposition of ammonium sulfate species was the main deactivation reason at low temperatures,which still exhibited the reactivity with NO above 200°C on the catalyst surface.There was a synergistic effect among NH_3,H_2O and SO_2that NH_3and H_2O both accelerated the catalyst deactivation in the presence of SO_2at 175°C.The thermal treatment at 400°C could regenerate the deactivated catalyst and get SCR activity recovered.The particle and monolith catalysts both kept stable NO_xconversion at 225°C with high concentration of H_2O and SO_2during the long time tests. 关键词：催化剂低温度 SO2 NB 性能钒 SCR 氧化物

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NH3-SCR performance and the resistance to SO2 for Nb doped vanadium based catalyst at low temperatures

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