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Methane decomposition over ceria modified iron catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
50625 46805 2010 5 PDF Available
Title
Methane decomposition over ceria modified iron catalysts
Abstract

The catalytic behaviour of ceria supported iron catalysts (Fe–CeO2) was investigated for methane decomposition. The Fe–CeO2 catalysts were found to be more active than catalysts based on iron alone. A catalyst composed of 60 wt.% Fe2O3 and 40 wt.% CeO2 gave optimal catalytic activity, and the highest iron metal surface area. The well-dispersed Fe state helped to maintain the active surface area for the reaction. Methane conversion increased when the reaction temperature was increased from 600 to 650 °C. Continuous formation of trace amounts of carbon monoxide was observed during the reaction due to the oxidation of carbonaceous species by high mobility lattice oxygen in the solid solution formed within the catalyst. This could minimise catalyst deactivation caused by carbon deposits and maintain catalyst activity over a longer period of time. The catalyst also produced filamentous carbon that helped to extend the catalyst life.

Graphical abstractThe catalytic behaviour of ceria supported iron catalysts (Fe–CeO2) was investigated for methane decomposition. The Fe–CeO2 catalysts were found to be more active than catalysts based on iron alone. A catalyst composed of 60 wt.% Fe2O3 and 40 wt.% CeO2 gave optimal catalytic activity, and the highest iron metal surface area.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights►Ceria supported iron particles (Fe–CeO2) were active catalysts for methane decomposition. The Fe–CeO2 catalysts were found to be more active than catalysts based on iron alone. ►At a composition of 60 wt.% Fe2O3 and 40 wt.% CeO2, the active iron phase displayed the highest iron metal surface area. The well-dispersed iron state helped to maintain the active surface area for the reaction. ►The continuous formation of trace amounts of carbon monoxide was observed during the reaction due to the oxidation of carbonaceous species by high mobility lattice oxygen in the solid solution formed within the catalyst. This could minimise catalyst deactivation caused by carbon deposits and maintain catalyst activity over a longer period of time. ►The catalyst also produced filamentous carbon that helped to extend the catalyst life.

Keywords
Methane decomposition; Ceria; Supported iron catalysts
First Page Preview
Methane decomposition over ceria modified iron catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 11, Issue 15, 25 September 2010, Pages 1215–1219
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis