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Low temperature selective catalytic reduction of NO by ammonia over V_2O_5-CeO_2/TiO_2

HUANG Yan1,TONG Zhi-quan1,WU Bing2,ZHANG Jun-feng1(1.Department of Environmental Engineering,Xiangtan University,Xiangtan 411105,China;2.Department of Chemical Engineering,Panzhihua University,Panzhihua 617003,China)  
Low temperature selective catalytic reduction of NO by NH3 over V2O5-CeO2/TiO2 was investigated with or without H2O and SO2.Results show that 5V30Ce/TiO2 prepared at 400℃ has high reaction activity,and its NO conversion is 99.2% under the conditions of 10000h-1 and 165℃.When the calcination temperature is below 500℃,Ce does not interact with V and CeO2 is the major existence form at the catalyst surface,which can increase the catalyst surface area and V2O5 dispersion to enhance the catalytic activity.Above 500℃,CeVO4 can be formed and it can decrease the activity.The performance of V2O5-CeO2/TiO2 is superior to resist water poisoning,and the deactivation degree under SO2 is more serious than that under SO2 and H2O.
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