Catalytic oxidation of CO on mesoporous codoped ceria catalysts:Insights into correlation of physicochemical property and catalytic activity
来源期刊：Journal of Rare Earths2019年第9期
论文作者：Hongjian Zhu Yingying Chen Yibo Gao Wenxu Liu Zhongpeng Wang Chenchen Cui Wei Liu Liguo Wang
文章页码：961 - 969
摘 要：Codoping approach is an appealing strategy to further improve the catalytic activity of Ce-based catalysts. In the present study,Mn and/or Cu doped ceria solid solutions MnxCuyCe1-x-yO2,CuxCe1-xO2,MnxCe1-xO2 and pure CeO2 were prepared by CTAB-assisted hydrothermal method for CO oxidation.XRD, SEM, EDS, BET, Raman, H2-TPR, XPS and in situ DRIFTS techniques were carried out to study the physicochemical properties and to correlate them to the activity. The doped samples maintain the cubic fluorite structure of CeO2 with high crystallinity and small crystallite size, forming Ce-based solid solutions. The obtained catalysts have large mesoporous structure with average pore size of 10-14 nm. The doped transition metal enhances the oxygen vacancies and improves reducibility of the solids. The synergistic interaction of Mn and Cu codoping induces mo re oxygen vacancies, pro moting the increase of surface adsorbed oxygen and the transfer of bulk oxygen of catalyst, thereby enhancing the catalytic activity for CO oxidation. Besides, the decomposition rate of the carbonate species which is derived from in situ DRIFTS for each catalyst can provide a measure to evaluate its catalytic activity of CO oxidation.
Hongjian Zhu，Yingying Chen，Yibo Gao，Wenxu Liu，Zhongpeng Wang，Chenchen Cui，Wei Liu，Liguo Wang
Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong,School of Water Conservation and Environment,University of JinanSchool of Environmental Science and Engineering,Shandong University
摘 要：Codoping approach is an appealing strategy to further improve the catalytic activity of Ce-based catalysts. In the present study,Mn and/or Cu doped ceria solid solutions MnxCuyCe1-x-yO2,CuxCe1-xO2,MnxCe1-xO2 and pure CeO2 were prepared by CTAB-assisted hydrothermal method for CO oxidation.XRD, SEM, EDS, BET, Raman, H2-TPR, XPS and in situ DRIFTS techniques were carried out to study the physicochemical properties and to correlate them to the activity. The doped samples maintain the cubic fluorite structure of CeO2 with high crystallinity and small crystallite size, forming Ce-based solid solutions. The obtained catalysts have large mesoporous structure with average pore size of 10-14 nm. The doped transition metal enhances the oxygen vacancies and improves reducibility of the solids. The synergistic interaction of Mn and Cu codoping induces mo re oxygen vacancies, pro moting the increase of surface adsorbed oxygen and the transfer of bulk oxygen of catalyst, thereby enhancing the catalytic activity for CO oxidation. Besides, the decomposition rate of the carbonate species which is derived from in situ DRIFTS for each catalyst can provide a measure to evaluate its catalytic activity of CO oxidation.
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