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Detailed mechanism and kinetic study of CO oxidation on cobalt oxide surfaces

Singh, Satyapaul A and Madras, Giridhar (2015) Detailed mechanism and kinetic study of CO oxidation on cobalt oxide surfaces. In: APPLIED CATALYSIS A-GENERAL, 504 (SI). pp. 463-475.

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Official URL: http://dx.doi.org/10.1016/j.apcata.2014.10.024

Abstract

Co3O4 catalysts were prepared by combustion synthesis using different fuels glycine (G), ODH (O) and urea (U). Morphological changes of the materials were observed by using different fuels. The prepared catalysts were characterized by XRD, XPS, SEM, TEM, BET and DRIFTS analysis. All compounds showed 100% conversion of CO below 175C. The prepared catalysts exhibited very high stability and conversions did not decrease even after 50 h of continuous operation. The oxygen storage capacity (OSC) of materials was measured by H-2-TPR analysis. Co3O4-O is having high OSC among the synthesized catalysts. The activation energies of these catalysts were found to be in the range of 42.3-64.8 kJ mol(-1). With DRIFTS analysis, the surface carbonates, superoxide anions, adsorbed CO, O-2 species on the catalyst surface were found and this information was used to develop a detailed reaction pathway. A kinetic model was developed with the help of proposed mechanism and used to fit the data. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords: Co3O4; DRIFTS analysis; Kinetic model; Reaction mechanism; CO oxidation
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 05 Nov 2015 07:24
Last Modified: 05 Nov 2015 07:24
URI: http://eprints.iisc.ac.in/id/eprint/52689

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