Immobilizing ultrafine bimetallic PtAg alloy onto uniform MnO_2 microsphere as a highly active catalyst for CO oxidation |
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| Authors: | Shengpeng Mo Peng Peng Yinchang Pei Taiming Shen Qinglin Xie Mingli Fu Yunfa Chen Daiqi Ye |
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| Institution: | 1. College of Environment Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. School of Environment and Energy, South China University of Technology, Guangzhou 510006, China;3. Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin University of Technology, Guilin 541004, China;4. State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Herein, a facile glycol reduction route is successful employed to synthesize bimetallic Pt Ag alloys with homogeneous distribution of sizes and elements. Experimental studies reveal that the ultrafine Pt Ag alloys with well-defined sizes from around 3.3 nm to 5.8 nm are immobilized onto MnO_2 microsphere,which remarkably enhances the catalytic performances for CO oxidation. Importantly, quasi in-situ X-ray photoelectron spectroscopy(XPS) result reveals that both Mn and Pt ions on the surface of catalysts would realize alternating reduction-oxidation by CO and O_2 molecules, and the oxygen vacancy sites could be replenished and excited by gas-phase O_2. |
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| Keywords: | Bimetallic alloys PtAg NPs Quasi in-situ XPS CO oxidation |
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