Promoting effect of Zr on the catalytic combustion of methane over Pd/γ-Al2O3 catalyst  

作　　者：Hongbo NA Tianle ZHU Zhiming LIU Yifei SUN 

机构地区：[1]School of Chemistry and Environment, Key Laboratory of Bio-Inspired Smart Interracial Science and Technology of Ministry of Education, Beihang University, Beijing 100191, China [2]State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

出　　处：《Frontiers of Environmental Science & Engineering》2014年第5期659-665,共7页环境科学与工程前沿（英文）

基　　金：Acknowledgements This research was supported by the National High Technology Research and Development Program of China （Nos. 2010AA064904 and 2012AA062702） and the National Natural Science Foundation of China （Grant No. 21177006）.

摘　　要：The effect of Zr on the catalytic performance of Pd/y-A1203 for the methane combustion was investigated. The results show that the addition of Zr can improve the activity and stability of Pd/γ-Al2O3 catalyst, which, based on the catalyst characterization （N2 adsorption, XRD, CO- Chemisorption, XPS, CHa-TPR and O2-TPO）, is ascribed to the interaction between Pd and Zr. The active phase of methane combustion over supported palladium catalyst is the Pd^0/Pd^2＋ mixture. Zr addition inhibits Pd aggregation and enhances the redox properties of active phase Pd^0/ Pd^2＋. H2 reduction could effectively reduce the oxidation degree of Pd species and regenerate the active sites （Pd^0/ pd^2＋）.The effect of Zr on the catalytic performance of Pd/y-A1203 for the methane combustion was investigated. The results show that the addition of Zr can improve the activity and stability of Pd/γ-Al2O3 catalyst, which, based on the catalyst characterization （N2 adsorption, XRD, CO- Chemisorption, XPS, CHa-TPR and O2-TPO）, is ascribed to the interaction between Pd and Zr. The active phase of methane combustion over supported palladium catalyst is the Pd^0/Pd^2＋ mixture. Zr addition inhibits Pd aggregation and enhances the redox properties of active phase Pd^0/ Pd^2＋. H2 reduction could effectively reduce the oxidation degree of Pd species and regenerate the active sites （Pd^0/ pd^2＋）.

关 键 词：Pd-Zr/Al2O3 METHANE catalytic combustion catalyst regeneration 

分 类 号：O643.21[理学—物理化学] TQ426.81[理学—化学]