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Influence of cobalt precursor and fuels on the performance of combustion synthesized Co3O4/γ-Al2O3 catalysts for total oxidation of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
43626 45979 2007 8 PDF Available
Title
Influence of cobalt precursor and fuels on the performance of combustion synthesized Co3O4/γ-Al2O3 catalysts for total oxidation of methane
Abstract

A series of nanosized Co3O4/γ-Al2O3 catalysts have been prepared using a combination of wetness impregnation and subsequent combustion synthesis (CS) in self-propagating mode. Alumina impregnated with various cobalt precursors and fuels, and respective as-burnt combustion-synthesized catalysts were characterised by TGA-DTA, IR-spectroscopy, N2 adsorption–desorption, XRD, SEM/EDX and TEM, and tested in the total oxidation of methane. The observed influence of the initial precursors cobalt acetate, mixtures of cobalt acetate/cobalt nitrate, and mixtures of cobalt nitrate wit fuels such as urea, citric acid, glycine, and glycerine on the catalytic performance correlates well with their combustion behaviour. Catalysts obtained with the combustion method at the highest velocities and the lowest temperatures during the synthesis were found to have the highest activity (complete conversion of methane at 400–425 °C). After two days of catalytic performance in the reaction, no considerable deactivation of combustion-synthesized catalysts was observed and their particle size remained about twice less in comparison with the sample prepared by cobalt nitrate thermal decomposition.

Graphical abstractCombination of wetness impregnation and combustion method in self-propagating mode was used for synthesis of nanosized Co3O4/γ-Al2O3 catalysts with high activity in total oxidation of methane. Catalytic performance of obtained catalysts correlates well with combustion behaviour of Co precursor and fuels. Complete conversion of methane with the Co3O4/Al2O3 catalysts synthesized from mixtures Co acetate/Co nitrate and Co nitrate/glycine was achieved at 400–425 °C. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Combustion synthesis; Nanosized supported catalyst; Co3O4/Al2O3; Methane oxidation
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Influence of cobalt precursor and fuels on the performance of combustion synthesized Co3O4/γ-Al2O3 catalysts for total oxidation of methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 323, 30 April 2007, Pages 226–233
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us