Effect of Gold Dispersion on the Photocatalytic Activity of Mesoporous Titania for the Vapor-Phase Oxidation of Acetone
Joint Authors
Gupta, N. M.
Awate, S. V.
Bhagwat, S. V.
Belhekar, A. A.
Kumar, R.
Source
International Journal of Photoenergy
Issue
Vol. 2008, Issue 2008 (31 Dec. 2008), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2007-12-31
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Abstract EN
Mesostructured titanium dioxide photocatalyst, having uniform crystallite size (6–12 nm) and average pore diameter of ∼4.2 nm, was synthesized by using a low-temperature nonsurfactant hydrothermal route, employing tartaric acid as a templating agent.
Gold additions from 0.5 to 2 wt% were incorporated, either during the hydrothermal process or by postsynthesis wet impregnation.
Compared to the impregnation-prepared samples, the samples synthesized hydrothermally contained smaller-size (≤1 nm) gold clusters occluded in the pores of the host matrix.
Whereas CO2 and H2O were the main reaction products in UV-assisted vapor-phase oxidation of acetone using these catalysts, C2H6 and HCO2CH3 were also produced for higher acetone concentrations in air.
The conversion of acetone was found to increase with decrease in the size of both TiO2 and gold particles.
In situ IR spectroscopy revealed that titania and gold particles serve as independent adsorption and reaction sites for acetone and oxygen molecules.
Acetone molecules adsorb exclusively at TiO2 surface, giving rise to a strongly adsorbed (condensed) state as well as to the formation of formate- and methyl formate-type surface species.
Hydroxyl groups at titania surface participate directly in these adsorption steps.
Nanosize gold particles, on the other hand, were primarily responsible for the adsorption and activation of oxygen molecules.
Mechanistic aspects of the photochemical processes are discussed on the basis of these observations.
American Psychological Association (APA)
Awate, S. V.& Belhekar, A. A.& Bhagwat, S. V.& Kumar, R.& Gupta, N. M.. 2007. Effect of Gold Dispersion on the Photocatalytic Activity of Mesoporous Titania for the Vapor-Phase Oxidation of Acetone. International Journal of Photoenergy،Vol. 2008, no. 2008, pp.1-13.
https://search.emarefa.net/detail/BIM-987947
Modern Language Association (MLA)
Awate, S. V.…[et al.]. Effect of Gold Dispersion on the Photocatalytic Activity of Mesoporous Titania for the Vapor-Phase Oxidation of Acetone. International Journal of Photoenergy No. 2008 (2008), pp.1-13.
https://search.emarefa.net/detail/BIM-987947
American Medical Association (AMA)
Awate, S. V.& Belhekar, A. A.& Bhagwat, S. V.& Kumar, R.& Gupta, N. M.. Effect of Gold Dispersion on the Photocatalytic Activity of Mesoporous Titania for the Vapor-Phase Oxidation of Acetone. International Journal of Photoenergy. 2007. Vol. 2008, no. 2008, pp.1-13.
https://search.emarefa.net/detail/BIM-987947
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-987947