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《Chinese Journal of Catalysis》 2001-02
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Structure and Properties of Co/SiO_2 Catalysts Prepared from Different Cobalt Salt Precursors for Methane Reforming with Carbon Dioxide

HUANG Chuanjing 1,2 , ZHENG Xiaoming 1* , FEI Jinhua 1 (1 Institute of Catalysis, Zhejiang University, Hangzhou 310028, China; 2 Department of Chemistry, Huaibei Coal Teachers College, Huaibei 235000, Anhui, China)  
Co/SiO 2 catalysts are prepared by impregnation method from different cobalt salt precursors, such as Co(NO 3) 2, Co(CH 3COO) 2, CoSO 4 and CoCl 2, respectively. The effects of cobalt salts, especially Co(NO 3) 2 and Co(CH 3COO) 2, on catalyst structure and performance in CO 2/CH 4 reforming are studied using activity evaluation as well as XRD, TPR, SEM and H 2 TPD techniques. Among the catalysts investigated, Co/SiO 2 starting from Co(CH 3COO) 2 exhibits the highest activity and stability. It maintains its high activity during 10 h of reaction at 973 or 1?073 K, while the catalyst from Co(NO 3) 2 shows notable deactivation after reaction at the same temperatures for only 6 h. The higher the cobalt loading or the lower the temperature, the greater the activity difference between the two catalysts. The results of characterization show that Co/SiO 2 catalysts prepared from Co(CH 3COO) 2 and Co(NO 3) 2 are greatly different in many ways, such as existence of Co species, metal support interaction, Co 0 particle size and resistance to sintering and coking. Combining the results of the reaction with the characterization of catalysts, it is established that CO 2/CH 4 reforming over Co/SiO 2 catalyst is of structure sensitivity, and the activity and stability of the catalyst are close related to the degree of dispersion of metallic cobalt and resistance to sintering and coking, respectively.
【Fund】: 浙江省自然科学基金! (ZD990 3 );; 安徽省重点科研项目! ( 0 0 0 2 10 88)
【CateGory Index】: O643
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