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Analysis of oxide and vanadate supports for catalytic hydrogen combustion: Kinetic and mechanistic investigations

Deshpande, Parag A and Polisetti, Sneha and Madras, Giridhar (2012) Analysis of oxide and vanadate supports for catalytic hydrogen combustion: Kinetic and mechanistic investigations. In: AIChE Journal, 58 (3). pp. 932-945.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/aic.126...

Abstract

Combustion synthesized oxide and vanadate compounds (CeO2, Fe2O3, CeVO4, and FeVO4) were tested for catalytic hydrogen combustion. The compounds were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. All the four compounds showed good activity and stability for catalytic hydrogen combustion and more than 95% conversion was observed over all the compounds within 500 degrees C. The mechanisms for the reaction over the different classes of compounds (cerium-based and iron-based compounds) were proposed on the basis of spectroscopic observations. The main difference in the mechanisms was in the nature of adsorption of H2 over the sites. The elementary processes for the reaction were proposed, corresponding rate expressions were derived, and the rate parameters for the reaction were estimated using nonlinear regression. Langmuir-Hinshelwood and Eley-Rideal mechanisms were also tested for the reaction and the proposed mechanism was compared with these mechanisms. (c) 2011 American Institute of Chemical Engineers AIChE J, 2012

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: catalytic hydrogen combustion;mechanism;kinetic models; parameter estimation;catalyst activity;stability
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 10 Apr 2012 09:57
Last Modified: 10 Apr 2012 09:57
URI: http://eprints.iisc.ernet.in/id/eprint/44161

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