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Materials 2017, 10(7), 756; https://doi.org/10.3390/ma10070756

Parametric Studies of Titania-Supported Gold-Catalyzed Oxidation of Carbon Monoxide

1
Department of Chemical and Environmental Engineering, University of Nottingham Malaysia, Jalan Broga, 43500 Selangor, Malaysia
2
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1 Zhongxiao East Road, Section 3, Da’an District, Taipei City 106, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Sofoklis Makridis
Received: 7 March 2017 / Revised: 21 June 2017 / Accepted: 28 June 2017 / Published: 5 July 2017
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

This paper remarks the general correlations of the shape and crystallinity of titanium dioxide (TiO2) support on gold deposition and carbon monoxide (CO) oxidation. It was found that due to the larger rutile TiO2 particles and thus the pore volume, the deposited gold particles tended to agglomerate, resulting in smaller catalyst surface area and limited gold loading, whilst anatase TiO2 enabled better gold deposition. Those properties directly related to gold particle size and thus the number of low coordinated atoms play dominant roles in enhancing CO oxidation activity. Gold deposited on anatase spheroidal TiO2 at photo-deposition wavelength of 410 nm for 5 min resulted in the highest CO oxidation activity of 0.0617 mmol CO/s.gAu (89.5% conversion) due to the comparatively highest catalyst surface area (114.4 m2/g), smallest gold particle size (2.8 nm), highest gold loading (7.2%), and highest Au0 content (68 mg/g catalyst). CO oxidation activity was also found to be directly proportional to the Au0 content. Based on diffuse reflectance infrared Fourier transform spectroscopy, we postulate that anatase TiO2-supported Au undergoes rapid direct oxidation whilst CO oxidation on rutile TiO2-supported Au could be inhibited by co-adsorption of oxygen. View Full-Text
Keywords: gold; catalyst; TiO2; photodeposition; carbon monoxide gold; catalyst; TiO2; photodeposition; carbon monoxide
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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 (CC BY 4.0).
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Chong, S.; Yang, T.-K. Parametric Studies of Titania-Supported Gold-Catalyzed Oxidation of Carbon Monoxide. Materials 2017, 10, 756.

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