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Spatial near-infrared imaging of hydroxyl band coverage on ceria-based catalysts

Aiouache, Farid and Oyama, Hiro and Kitagawa, Kuniyuki (2006) Spatial near-infrared imaging of hydroxyl band coverage on ceria-based catalysts. AIChE Journal, 52 (4). pp. 1516-1521. ISSN 0001-1541

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Abstract

High-throughput near-infrared imaging was used to distinguish catalyst activity for low-temperature methane steam-reforming. Geminal hydroxyls of reduced ceria were depicted during methane reforming at 673 K. The changes in absorbance maps under various water partial pressures showed evidence of formate intermediate formations without redox exchanges. Higher resolution was observed in absorbance change images than that of thermal images obtained from catalyst surface self-emissions. The experimental results illustrated higher activity of pure rhodium catalyst than that of bimetallic ones, likely because of the high dispersion of rhodium on the catalyst support. Moreover, the reaction was accelerated when high surface area silica was added because more reduced sites were exposed. Our filter bandwidths limited our interest in band-shift distribution of geminal hydroxyl band during the reduction process. (c) 2005 American Institute of Chemical Engineers.

Item Type: Article
Journal or Publication Title: AIChE Journal
Uncontrolled Keywords: near-infrared imaging ; methane reforming ; ceria ; redox ; combinatorial ; high throughput
Subjects:
Departments: Faculty of Science and Technology > Engineering
ID Code: 60664
Deposited By: ep_importer_pure
Deposited On: 03 Jan 2013 11:09
Refereed?: Yes
Published?: Published
Last Modified: 21 Sep 2017 05:21
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/60664

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