Visible light-induced partial oxidation of cyclohexane on WO3 loaded with Pt nanoparticles

Yasuhiro Shiraishi; Yoshitsune Sugano; Satoshi Ichikawa; Takayuki Hirai

doi:10.1039/C1CY00331C

Visible light-induced partial oxidation of cyclohexane on WO₃ loaded with Ptnanoparticles

Yasuhiro Shiraishi,*^a Yoshitsune Sugano,^a Satoshi Ichikawa^b and Takayuki Hirai^a

* Corresponding authors

^a Research Center for Solar Energy Chemistry, and Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Japan
E-mail: shiraish@cheng.es.osaka-u.ac.jp
Fax: +81-6-6850-6273
Tel: +81-6-6850-6271

^b Institute for NanoScience Design, Osaka University, Toyonaka, Japan

Abstract

Photocatalytic oxidation of cyclohexane (CHA) with molecular oxygen (O₂) was carried out using WO₃ loaded with Pt nanoparticles (Pt/WO₃) under irradiation of visible light (λ > 420 nm). The Pt/WO₃ catalysts promote oxidation of CHA and give rise to partial oxidation products such as cyclohexanol (CHA-ol) and cyclohexanone (CHA-one) with ca. 93% selectivity. Among the catalysts, Pt/WO₃ with 0.2 wt% Pt shows the highest activity. The high selectivity for partial oxidation on Pt/WO₃ is because subsequent photocatalytic decomposition of partial oxidation products is suppressed. In the Pt/WO₃ system, the photoformed electrons on the conduction band of WO₃ are consumed by a multi-electron reduction of O₂ on the Pt particles (formation of H₂O and H₂O₂), where a single-electron reduction of O₂ is unfavored. This suppresses the formation of a superoxide anion (O₂˙⁻) that promotes decomposition of CHA-ol and CHA-one and, hence, results in selective formation of partial oxidation products.

Article information

https://doi.org/10.1039/C1CY00331C

Article type

Paper

Submitted

20 Aug 2011

Accepted

04 Nov 2011

First published

22 Nov 2011

Download Citation

Catal. Sci. Technol., 2012,2, 400-405

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Visible light-induced partial oxidation of cyclohexane on WO₃ loaded with Pt nanoparticles

Y. Shiraishi, Y. Sugano, S. Ichikawa and T. Hirai, Catal. Sci. Technol., 2012, 2, 400 DOI: 10.1039/C1CY00331C

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Catalysis Science & Technology