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Enhancing the Carbon Monoxide Oxidation Performance through Surface Defect Enrichment of Ceria-Based Supports for Platinum Catalyst

Journal Article · · Environmental Science and Technology
 [1];  [2];  [1];  [3];  [4];  [5];  [1];  [1];  [1];  [5];  [5];  [6];  [6];  [7];  [2];  [8];  [9]
  1. Univ. of Central Florida, Orlando, FL (United States)
  2. Beijing University of Technology (China)
  3. Univ. of Central Florida, Orlando, FL (United States); Nanjing Univ. (China)
  4. Tufts Univ., Medford, MA (United States); Aramco Boston Research Center, Cambridge, MA (United States)
  5. Chinese Academy of Sciences (CAS), Xiamen (China). Institute of Urban Environment
  6. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  7. Columbia Univ., New York, NY (United States)
  8. Tufts Univ., Medford, MA (United States)
  9. Univ. of California, Riverside, CA (United States); Univ. of Central Florida, Orlando, FL (United States)
Effective synthesis and application of single-atom catalysts on supports lacking enough defects remain a significant challenge in environmental catalysis. Herein, we present a universal defect-enrichment strategy to increase the surface defects of CeO2-based supports through H2 reduction pretreatment. The Pt catalysts supported by defective CeO2-based supports, including CeO2, CeZrOx, and CeO2/Al2O3 (CA), exhibit much higher Pt dispersion and CO oxidation activity upon reduction activation compared to their counterpart catalysts without defect enrichment. Specifically, Pt is present as embedded single atoms on the CA support with enriched surface defects (CA-HD) based on which the highly active catalyst showing embedded Pt clusters (PtC) with the bottom layer of Pt atoms substituting the Ce cations in the CeO2 surface lattice can be obtained through reduction activation. Embedded PtC can better facilitate CO adsorption and promote O2 activation at PtC–CeO2 interfaces, thereby contributing to the superior low-temperature CO oxidation activity of the Pt/CA-HD catalyst after activation.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
2432555
Report Number(s):
BNL--225931-2024-JAAM
Journal Information:
Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 28 Vol. 58; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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