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Low temperature complete combustion of methane over cobalt chromium oxides catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55091 47040 2013 7 PDF Available
Title
Low temperature complete combustion of methane over cobalt chromium oxides catalysts
Abstract

Cobalt chromium oxides with different Co/Cr ratios were prepared via co-precipitation method and their catalytic performances on methane combustion were evaluated from 300 °C to 650 °C at a space velocity of 36,000 h−1. A significant improvement of activity was observed over the Co1Cr2 catalyst with a Co/Cr molar ratio of 1:2, and the methane conversion reached 90% at 464 °C. The Co1Cr2 catalyst also showed excellent resistance to water vapor poisoning. In addition, the catalytic activity was inhibited in the presence of water vapor at the entire temperature range, while catalytic activity decreased only at low temperature in the presence of sulfur dioxide. Based on BET, TPR, XRD and XPS results, the superior performance of Co1Cr2 would origin from the higher valence and coordination number of the metal ions. Both Cr3+ and Cr6+ species were observed on the surface of cobalt chromites, and Cr6+ causes disorders in the spinel structure of cobalt chromites, which would enhance the adsorption of chemisorbed oxygen species and thus improve the catalytic performance, especially at low temperature.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (144 K)Download as PowerPoint slideHighlights► A significant improvement of activity was observed over the Co1Cr2 catalyst with a Co/Cr molar ratio of 1:2. ► The superior performance of Co1Cr2 would origin from the higher valence and coordination number of the metal ions. ► Cr6+ causes the disorders in the spinel structure of cobalt chromites and enhances the adsorption of chemisorbed oxygen species at low temperature.

Keywords
Methane combustion; Spinel; Cobalt; Chromium; Promotional effect
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Low temperature complete combustion of methane over cobalt chromium oxides catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 12–18
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