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《Chinese Journal of Catalysis》 2006-02
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Preparation and Characterization of Mesoporous Mixed Oxide Catalyst La-Co-Zr-O

ZOU Zhiqiang~1,MENG Ming~(1*),ZHA Yuqing~1,XIE Yaning~2,HU Tiandou~2, LIU Tao~2(1 Department of Catalysis Science and Technology,School of Chemical Engineering, Tianjin University,Tianjin 300072,China;2 Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 100049,China)  
The mixed/complex oxide catalysts prepared by the normal co-precipitation method possess low surface area,poor component dispersion,and wide pore size distribution.In this work,the method for the Si-Al zeolite synthesis was used for reference to prepare the La-Co-Zr-O((La+Co)/(La+Co+Zr) atomic ratio was 0.5) mixed oxide catalysts with large surface area and narrow pore size distribution.Cetyl trimethyl ammonium bromide(CTAB),p-octyl polyethylene glycol phenyl ether(OP),and their mixture were used as the templates,respectively.N_2 adsorption,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),(extended) X-ray absorption fine structure(EXAFS) spectroscopy,and temperature-programmed reduction((H_2-TPR)) were employed to characterize the catalysts.The N_2 adsorption results show that the obtained samples possess large specific surface area(96.6~117.6 m~2/g) and uniform pore diameter(3.5~4.3 nm).The results of XRD,XPS,and Co K-edge EXAFS indicate that the highly dispersed Co_3O_4 crystallite(23~33 nm) is the main active phase for CO oxidation.Compared with the catalyst prepared by co-precipitation method,the samples prepared by citric acid complexation-organic template decomposition method have much higher component dispersion and catalytic activity.The H_2-TPR results reveal that the Co_3O_4 phase in the sample prepared using mixed templates of CTAB and OP is easier to be reduced,which is relevant to the catalyst activity for CO(oxidation.)
【Fund】: 天津市自然科学基金(05YFJMJC09700);; 天津大学985教育振兴行动计划资助项目
【CateGory Index】: O643.36
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