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《Chinese Journal of Catalysis》 2003-09
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Effect of SO_2 on NO Catalytic Oxidation Studied by TPD Method

LI Ping 1, LU Guanzhong 1* , ZHAO Xiuge 2, XIAO Wende 2(1 Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China; 2 Research Center of Chemical Reaction Engineering, East China University of Science and Technology, Shanghai 200237, China)  
Simultaneous removal of SO 2 and NO x from flue gas can be achieved with high efficiency using Al 2O 3 based sorbents through oxidative adsorption. The enhancement of NO adsorption and oxidation induced by SO 2 over active Al 2O 3 and supported transition metal oxide catalysts was observed in the experiments. The influence of reaction temperature on SO 2 promotion was investigated in a gas flow fixed bed reactor. Within the range of 50~250 ℃, NO could be oxidized largely over the active Al 2O 3 support as well as the supported catalysts into NO 2 in the presence of SO 2. The NO 2 production reduced rapidly beyond the temperature range. The TPD study was carried out for Al 2O 3 when it had preadsorbed reactive gases with different components or at different temperatures. The adsorption of SO 2 on the support surface favored the formation of NO 2, which could be desorbed at higher temperatures, from NO oxidative adsorption species. The effect of SO 2 on NO 2 adsorption over Co 3O 4/Al 2O 3 catalyst was also studied by TPD method. The pre adsorption of SO 2 or its co adsorption with NO 2 could prevent the NO 2 adsorption species from decomposition, meaning that the SO 2 on the surface of support or catalyst can interact with NO 2 and stabilize it. And the weakly bonded SO 2 species changed into strong adsorption species or surface sulfates after NO 2 desorption. Nevertheless, SO 2 in the gas phase competed for the sites that had been occupied by NO 2. One kind of multi molecular intermediate species formed by combining weakly adsorbed SO 2 and NO O 2 in an appropriate temperature range was suggested as active species for producing NO 2 in the presence of SO 2.
【Fund】: 国家自然科学基金资助项目 (2 963 3 0 3 0 )
【CateGory Index】: O643.3
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