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

A series of ultrafine bimetallic PtAg alloys were immobilized onto MnO2 microspheres, which remarkably enhanced the catalytic activity for CO oxidation. [Display omitted] Herein, a facile glycol reduction route is successful employed to synthesize bimetallic PtAg alloys with homogeneous distribution...

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Bibliographic Details
Published in:Chinese chemical letters 2021-06, Vol.32 (6), p.2057-2060
Main Authors: Mo, Shengpeng, Peng, Peng, Pei, Yinchang, Shen, Taiming, Xie, Qinglin, Fu, Mingli, Chen, Yunfa, Ye, Daiqi
Format: Article
Language:English
Subjects:
Bimetallic alloys
CO oxidation
MnO2
PtAg NPs
Quasi in-situ XPS
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Summary:A series of ultrafine bimetallic PtAg alloys were immobilized onto MnO2 microspheres, which remarkably enhanced the catalytic activity for CO oxidation. [Display omitted] 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 MnO2 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 O2 molecules, and the oxygen vacancy sites could be replenished and excited by gas-phase O2.
ISSN:1001-8417
1878-5964
DOI:10.1016/j.cclet.2020.11.062