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Catalytic reduction of NO over Mn-V-Ce/TiO_2 catalysts at low reaction temperature

ZHENG Zu-hong1,TONG Hua2,TONG Zhi-quan1,HUANG Yan1,LUO Jing1(1.Department of Environmental Science and Engineering,Xiangtan University,Xiangtan 411105,China;2.Department of Environmental Engineering,Beijing University of Chemical Technology,Beijing 100029,China)  
A novel Mn-V-Ce/TiO2 catalyst for selective catalytic reduction(SCR) of nitric oxide was prepared by impregnation method.The effects of reaction temperature,NO and O2 concentrations,NH3/NO ratio and space velocity on Mn-V-Ce/TiO2 catalytic activity were studied.The SCR reaction mechanism on this catalyst was explored with transient response reaction of NO,O2,and NH3.The effect of H2O and SO2 on the catalyst activity was investigated using FT-IR and TG techniques.Experimental results showed that Mn-V-Ce/TiO2 catalyst has good SCR activity at low temperature.High NO conversion of over 99.2% were observed at 150 ℃ and space velocity 5 000 h-1.When both SO2 and H2O were added in feed gas,the NO conversion could be kept over 98% at 170 ℃ for 350 min.However,it was observed that the loss of catalytic activity was quick when SO2 was added in feed gas alone;while 8% H2O alone in feed gas had little negative effect on the catalytic activity,which was always over 98% at this situation.The catalyst is expected to be applied in the removal of NOx from exhaust gas without SO2 at low temperature,such as exhaust gas from nitric acid production process or boilers of natural gas.
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