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International Journal of Chemical Engineering
Volume 2010, Article ID 309103, 9 pages
http://dx.doi.org/10.1155/2010/309103
Research Article

C O 2 Reforming Performance and Visible Light Responsibility of Cr-Doped T i O 2 Prepared by Sol-Gel and Dip-Coating Method

1Division of Mechanical Engineering, Graduate School of Engineering, Mie University, 1577 Kurimamachiya-Cho, Tsu 514-8507, Japan
2School of Mechanical Engineering, The University of Adelaide, SA 5005, Australia

Received 19 May 2010; Revised 26 June 2010; Accepted 26 June 2010

Academic Editor: Xijun Hu

Copyright © 2010 Akira Nishimura et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A Cr-doped T i O 2 film was prepared by sol-gel and dip-coating method and used as the photocatalyst for C O 2 reforming under the visible light. The ratio of amount of Cr added to amount of Ti in T i O 2 sol solution (R) varied from 0 to 100 wt%. The total layer number of Cr-doped T i O 2 film (N) coated was up to 7. The C O 2 reforming performance with the Cr-doped T i O 2 film was evaluated by illuminating under a Xe lamp with or without ultraviolet (UV) light. The concentration of CO which was a product from C O 2 reforming was maximized for 𝑅 = 7 0  wt% when N equals to 1. The visible light responsibility was also maximized for 𝑅 = 7 0  wt%. The amount of Cr within T i O 2 film coated on copper disc was increased with the increase in R up to 70 wt% and started to decrease when R is over 70 wt%. The C O 2 reforming performance of T i O 2 film with one layer Cr-doped was found better than that of T i O 2 film with multi Cr-doped layers under illuminating of UV light. Under the visible light, the performance was maximized at 𝑅 = 7 0  wt% and 𝑁 = 7 with one layer Cr-doped.