Role of gold nanoclusters supported on TiO2(110) model catalyst in CO oxidation reaction

Anton Visikovskiy, Kei Mitsuhara, Yoshiaki Kido

研究成果: ジャーナルへの寄稿学術誌査読

12 被引用数 (Scopus)

抄録

It was reported previously that O adatoms adsorbed dissociatively on the five-fold Ti rows of rutile TiO2(110) made the surface O-rich and reacted with CO molecules to form CO2. An electronic charge transfer taking place from gold nanoclusters to the O-rich TiO2(110) support played a crucial role to enhance the catalytic activity [Mitsuhara, J. Chem. Phys. 136, 124303 (2012)]. In this study, the authors have further accumulated experimental data for the CO oxidation reaction enhanced by gold nanoclusters on the TiO2(110) surface. Based on the results obtained here and previously, the authors propose an "interface dipole model," which explains the strong activity of Au nanoclusters supported on O-rich TiO 2(110) in CO oxidation reaction. Simultaneously, the authors also discuss the cationic cluster model proposed by Wang and Hammer [Phys. Rev. Lett. 97, 136107 (2006)] and the d-band model predicted by Hammer and Nørskov [Adv. Catal. 45, 71 (2000)]. The latter is, in particular, widely accepted to explain the activities of heterogeneous catalysts. Contrary to the d-band model, our ab initio calculations demonstrate that the d-band center for Au nanoclusters moves apart from the Fermi level with decreasing the cluster size and this is due to contraction of the Au-Au bond length.

本文言語英語
論文番号061404
ジャーナルJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
31
6
DOI
出版ステータス出版済み - 11月 2013

!!!All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜

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