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《Journal of Fuel Chemistry and Technology》 2010-01
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Alkali deactivation and regeneration of nano V_2O_5-WO_3/TiO_2 catalysts

SHEN Bo-xiong,XIONG Li-xian,LIU Ting,WANG Jing,TIAN Xiao-juan(College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China)  
The nano TiO2/ceramic supported V2O5-WO3 catalysts(V2O5-WO3/TiO2(C)) were prepared.Their poisoning by alkali metal(K,Na) impregnated and regeneration were investigated.The catalysts were characterized by XRD,FT-IR,H2-TPR,XPS measurements.The results indicated that the catalytic activity is decreased by adding alkali metals;potassium is more poisonous than sodium.FT-IR results suggested that Lewis acid sites in the catalysts are active in the de-NOx reaction.H2-TPR and XPS analysis revealed that potassium leads to a decrease of the surface redox ability,which may reduce the oxygen adsorption and the SCR activity of the catalyst.Washing with water can not get back the catalyst activity,suggesting that potassium is not physically deposited on the catalyst surface.The activity of the poisoned catalysts can be well regenerated by washing with sulfuric acid at high temperature.
【Fund】: 国家自然科学基金(50976050);; 新世纪优秀人才计划(NCET-07-0457);; 天津科技支撑计划(09ZCKFSH01900)
【CateGory Index】: X703.5
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