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《Environmental Science & Technology》 2017-01
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Influence of WO_3 Doping on Properties of V_2O_5/TiO_2-ZrO_2 Catalysts for Selective Catalytic Reduction of NO_x by NH_3

XU Haitao;ZHU Yiwen;ZHANG Yaping;WANG Longfei;ZHAO Yingjie;JIN Baosheng;Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University;  
TiO_2-ZrO_2 solid solution was prepared by a co-precipitation method and V_2O_5-(x%)WO_3/TiO_2-ZrO_2 catalysts were prepared using the impregnation method.The physicochemical properties were investigated by X-ray diffraction(XRD),BET specific surface area,NH_3 temperature-programmed desorption(NH_3-TPD),in situ diffuse reflectance infrared Fourier transform spectroscopy(in situ DRIFTS) and high-resolution transmission electron microscopy(HRTEM).Their catalytic performance for the selective catalytic reduction of NO_x was tested,as well as the effect of SO_2 and H_2O on SCR catalytic activity for the preferred catalysts.It was found that the strength of Lewis acid sites and the stability of the pore structure are increased with the load of WO_3.The results of catalytic activity indicated that the catalyst with 9%WO_3 content exhibits 92%NO conversion within the wide temperature range of 300 ℃ to 400 ℃ due to the most stable pore structure,the most active species-NH_2 on the surface and the biggest absorbing capacity of NH_3.When SO_2 and H_2O get into the flue gas,the SCR catalytic activity sharply decreases and it is an irreversible process.
【Fund】: 国家自然科学基金项目(51306034);; 江苏省重点研发计划项目(BE2015677);; 国家重点基础研究发展计划项目(2013CB228505)
【CateGory Index】: X773
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