Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 278, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119304
Keywords
Single-atom catalyst; Metal-support interaction; Electronic structure; Interface distortion; VOC oxidation; Intrinsic mechanism
Funding
- National Natural Science Foundation of China [21876139, 21922606, 21677114]
- Key R&D Program of Shaanxi Province [2019SF-244, 2019ZDLSF05-05-02]
- Shaanxi Natural Science Fundamental Shaanxi Coal Chemical Joint Fund [2019JLM-14]
- Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of China [51888103]
- K.C. Wong Education Foundation
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Exploring thermally robust single atom catalysts (SACs) is of great significance. Here, we develop a universal strategy for stabilizing Pt atoms on the mono-oxygen vacancies of CeO2 with diverse exposed facets. The stabilization mechanism was proposed that the formed Pt-O-Ce interface will be taken into distortion spontaneously to keep thermodynamics stable through strong metal-support interactions. The highest degree of Pt-O-Ce distortion is achieved over Pt1-CeO2{100} material, which exhibits exceptional efficiency and thermal stability for oxygenated hydrocarbon removal. The enhanced adsorption capacity of O-2 and methanol confirmed in the distortion interface is seen as another crucial reason for improving the stability of SACs. Methanol oxidation on Pt1-CeO2{100} obeys the L-H mechanism under relatively low temperature and then goes through to the MVK mechanism with temperature increasing. We believe that these results would bring new opportunities in the fabrication of SACs and applications of them in thermal reactions.
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