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《Chinese Journal of Catalysis》 2014-09
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Effect of sulfur poisoning on Co_3O_4 CeO_2 composite oxide catalyst for soot combustion

Xiaoyan Shi;Yunbo Yu;Li Xue;Hong He;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences;School of Chemical Engineering,Shandong University of Technology;  
CeO2, Co3O4, and a series of Co3O4/CeO2 composite oxides prepared by co‐precipitation were ex‐posed to SO2 under an oxidizing environment at 400 °C. These fresh and SO2‐poisoned samples were characterized by in situ diffuse reflectance infrared Fourier transform spectroscopy, X‐ray diffraction, temperature‐programmed desorption, and X‐ray photoelectron spectroscopy. Sulfates were formed on the oxides, with more sulfates on CeO2 than on Co3O4. On the Co3O4/CeO2 composite oxides, both cobalt sulphate and ceria sulfate were formed. Fresh and sulfated samples were tested for soot combustion in a NO/O2 gas flow. The Co3O4/CeO2 composite oxides showed better SO2 tol‐erance and higher activity than CeO2 but were more easily poisoned by SO2 than Co3O4.
【Fund】: supported by the National Basic Research Program of China (973 Program 2010CB732304);; the State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex (SCAPC201302)~~
【CateGory Index】: O643.362
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