Identification of active sites for CO and CH₄ oxidation over PdO/Ce_{1鈭?span style='font-style: italic'>x}Pd_xO_{2鈭?span style='font-style: italic'>未} catalysts

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• 作者：Lian Meng^a ; Jian-Jun Lin^a ; Zhi-Ying Pu^b ; Liang-Feng Luo^c ; Ai-Ping Jia^a ; Wei-Xin Huang^c ; Meng-Fei Luo^a ; ^{mengfeiluo@zjnu.cn} ; Ji-Qing Lu^a ; ^{jiqinglu@zjnu.cn}
• 关键词：PdOx species ; Ce1&minus ; xPdxO2&minus ; 未 solid solution ; Active site ; Specific reaction rate ; Acid treatment
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：30 May, 2012
• 卷：119-120
• 期：Complete
• 页码：117-122
• 文件大小：839 K

摘要

A PdO/Ce_1鈭?em>xPd_xO_2鈭?em>未 catalyst containing surface PdO_x (x = 1-2) species and Ce_1鈭?em>xPd_xO_2鈭?em>未 solid solution was prepared by a solution combustion method. It was found that the surface PdO_x species could be removed by nitric acid treatment. Also, partial Pd⁴⁺ cations in the CeO₂ lattice migrated to the surface to form surface PdO_x species after high temperature calcination (500 掳C). The catalyst was tested for catalytic CO and CH₄ oxidation. For CO oxidation, the specific reaction rate of the surface PdO_x species () was 249 times as high as that of the Ce_1鈭?em>xPd_xO_2鈭?em>未 solid solution (), due to the fact that the surface PdO_x species provided CO chemisorption sites. While for CH₄ oxidation, the specific reaction rate of the Ce_1鈭?em>xPd_xO_2鈭?em>未 solid solution () was higher than that of the PdO/Ce_1鈭?em>xPd_xO_2鈭?em>未 catalyst (), due to the covered Ce_1鈭?em>xPd_xO_2鈭?em>未 surface by surface PdO_x species.