Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 44, Pages 38134-38140Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b15585
Keywords
in situ formation; Pt single atoms; porous nanorods of CeO2; bimetallic PtCe sites; CO oxidation
Funding
- National Natural Science Foundation of China [21401148, 21473084, 21872109]
- Natural Science Foundation of Shandong Province [ZR2017BB035]
- DOE Office of Science [DE-SC0012704]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Cyrus Tang Foundation through the Tang Scholar program
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Identification of the chemical states of catalytic sites is critical for an atomic-level understanding of catalytic mechanisms. Herein, hydrogen thermal pretreatment of the Pt single atoms on porous nanorods of CeO2 (Pt-1/PN-CeO2) induced the formation of isolated bimetallic PtCe sites as a new type of active center for CO oxidation. The evolutions of Pt-1/PN-CeO2 catalysts during the hydrogen pretreatment and CO oxidation were examined by various in situ techniques including infrared, ambient-pressure X-ray photoelectron and X-ray absorption spectroscopy. The experimental results demonstrate that these bimetallic sites can be partially preserved or reoxidized into Pt-O-Ce with a low coordination number with oxygen under realistic conditions, leading to the appropriate CO adsorption and activating the efficient activity of Pt-1/PN-CeO2 for CO oxidation at low temperature.
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