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Immobilizing ultrafine bimetallic PtAg alloy onto uniform MnO2 microsphere as a highly active catalyst for CO oxidation

Authors
  • Mo, Shengpeng
  • Peng, Peng
  • Pei, Yinchang
  • Shen, Taiming
  • Xie, Qinglin
  • Fu, Mingli
  • Chen, Yunfa
  • Ye, Daiqi
Publication Date
Jun 01, 2021
Source
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
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Abstract

Herein, a facile glycol reduction route is successful employed to synthesize bimetallic PtAg alloys with homogeneous distribution of sizes and elements. Experimental studies reveal that the ultrafine PtAg 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. (C) 2021 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.

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