A comparative study in structure and reactivity of “FeO_x-on-Pt” and “NiO_x-on-Pt” catalysts  

作　　者：Rentao Mu Qiang Fu Xiaoguang Guo Xuejun Xu Dali Tan Xinhe Bao 

机构地区：[1]State Key Laboratory of Catalysis [2]Dalian Institute of Chemical Physics, the Chinese Academy of Sciences

出　　处：《Science China Chemistry》2015年第1期162-168,共7页中国科学（化学英文版）

基　　金：financially supported by the National Natural Science Foundation of China(21222305,11079005,20923001);the National Basic Research Program of China(2011CBA00503,2013CB933100)

摘　　要：Oxide nanostructures grown on noble metal surfaces are often highly active in many reactions,in which the oxide/metal interfaces play an important role.In the present work,we studied the surface structures of Fe Ox-on-Pt and Ni Ox-on-Pt catalysts and their activity to CO oxidation reactions using both model catalysts and supported nanocatalysts.Although the active Fe O1x structure is stabilized on the Pt surface in a reductive reaction atmosphere,it is prone to change to an Fe O2x structure in oxidative reaction gases and becomes deactivated.In contrast,a Ni O1x surface structure supported on Pt is stable in both reductive and oxidative CO oxidation atmospheres.Consequently,CO oxidation over the Ni O1x-on-Pt catalyst is further enhanced in the CO oxidation atmosphere with an excess of O2.The present results demonstrate that the stability of the active oxide surface phases depends on the stabilization effect of the substrate surface and is also related to whether the oxide exhibits a variable oxidation state.Oxide nanostructures grown on noble metal surfaces are often highly active in many reactions, in which the oxide/metal interfaces play an important role. In the present work, we studied the surface structures of FeOx-on-Pt and NiOx-on-Pt catalysts and their activity to CO oxidation reactions using both model catalysts and supported nanocatalysts. Although the active FeO1-x structure is stabilized on the Pt surface in a reductive reaction atmosphere, it is prone to change to an FeO2-x structure in oxidative reaction gases and becomes deactivated. In contrast, a NiO1-x surface structure supported on Pt is stable in both reductive and oxidative CO oxidation atmospheres. Consequently, CO oxidation over the NiO1-x-on-Pt catalyst is further enhanced in the CO oxidation atmosphere with an excess of O2. The present results demonstrate that the stability of the active oxide surface phases depends on the stabilization effect of the substrate surface and is also related to whether the oxide exhibits a variable oxidation state.

关 键 词：interface catalysis surface catalysis platinum CO oxidation oxide 

分 类 号：O643.36[理学—物理化学] TB383[理学—化学]