Role of the Support Oxidation State on the Catalytic Activity of Two-Dimensional Pt/TiOx Catalysts

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The interaction between metal and support is known to substantially enhance catalytic activity. Herein, we investigate the effect of the support's oxidation state on the metal-support interaction (MSI) with twodimensional Pt/TiOx catalysts. Using titanium oxide supports with five different oxidation states and Pt nanoparticles deposited on the supports via arc plasma deposition, we accurately performed the CO oxidation reaction in a batch reactor. We confirmed that the catalyst whose support has the highest oxidation state exhibits the best catalytic activity. The catalysts' turnover frequency value varied sequentially from 4.0 to 19.4 at 513 K, and the activation energy also varied sequentially from 23.90 to 19.13 kcal/mol depending on the oxidation states of the supports. Kinetic studies have shown that the additional reaction pathway following the Mars-van Krevelen mechanism formed at the metal-oxide interface, which was affected by the oxidation states of the supports. The compositional effects of the support were confirmed by X-ray photoelectron spectroscopy analysis: the MSI effect was maintained even after the surface of the titanium oxides completely oxidized.
Publisher
AMER CHEMICAL SOC
Issue Date
2023-03
Language
English
Article Type
Article
Citation

JOURNAL OF PHYSICAL CHEMISTRY C, v.127, no.8, pp.4096 - 4103

ISSN
1932-7447
DOI
10.1021/acs.jpcc.2c08935
URI
http://hdl.handle.net/10203/305724
Appears in Collection
CH-Journal Papers(저널논문)
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