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Theoretical study on the mechanism of alcohol photooxidation on Nb2O5 surface.
Wang, Wei-Wei; Tanaka, Tsunehiro; Ehara, Masahiro.
Afiliação
  • Wang WW; Shaanxi Key Laboratory of High-Orbits Electron Materials and Protection Technology for Aerospace, School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, China.
  • Tanaka T; Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan.
  • Ehara M; Research Center for Computational Science, Institute for Molecular Science, Okazaki, Japan.
J Comput Chem ; 45(25): 2128-2135, 2024 Sep 30.
Article em En | MEDLINE | ID: mdl-38760960
ABSTRACT
Theoretical modeling of the solid-state photocatalysis is one of the important issues as various useful photocatalysts have been developed to date. In this work, we investigated the mechanism of the alcohol photooxidation on niobium oxide (Nb2O5) which was experimentally developed, using the density functional theory (DFT)/time-dependent (TD)DFT calculations based on the cluster model. The alcohol adsorption and the first hydrogen transfer from hydroxy group to surface occur in the ground state, while the second hydrogen transfer from CH proceeds in the excited states during the photoirradiation of UV or visible light. The spin crossing was identified and the low-lying triplet states were solved for the reaction pathway. The photoabsorption in the visible light region was characterized as the charge transfer transition from O 2p of alcohol to Nb 4d of the Nb2O5 surface. The spin density and the natural population analysis indicated the generation of spin density in the moiety of carbonyl compound and its dissipation to the interface of the surface, which partly explains the electron paramagnetic resonance measurement. It was confirmed that the rate determining step is the desorption of carbonyl compound and water molecule in agreement with the experimental rate equation analysis. The present findings with the theoretical modeling will provide useful information for the further studies of the solid-state photocatalysis.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article