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^*

Source：CHINESE CHEMICAL LETTERS, 2021, 32(6): 2057-2060.

DOI：10.1016/j.cclet.2020.11.062

• Bimetallic alloys
• PtAg NPs
• MnO2
• Quasi in-situ XPS
• CO oxidation

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.

• Institution
  桂林理工大学; 中国科学院