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The effect of thermodynamic properties of zirconia-supported Fe3O4 on water-gas shift activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
42552 45930 2009 6 PDF Available
Title
The effect of thermodynamic properties of zirconia-supported Fe3O4 on water-gas shift activity
Abstract

The thermodynamics of the oxidation and reduction of a series of zirconia- and alumina-supported iron-oxide catalysts were measured using coulometric titration and then compared to their activity for the water-gas shift (WGS) reaction. For the supported iron oxide catalysts with weight loadings of 5–30 wt%, the Gibbs free energy for the phase transition between Fe2O3 and Fe3O4 decreased by factor of two compared to that for bulk, unsupported iron oxide. This difference in thermodynamic properties was also found to affect the WGS reaction rates, with the rates on the supported catalysts being an order of magnitude lower than that for bulk iron oxide. We propose that the differences in the thermodynamic properties of the supported and unsupported catalysts are due to lattice strain in the supported iron oxide resulting from interactions at the FeOx-support interface.

Graphical abstractThe thermodynamics of the oxidation and reduction of a series of zirconia- and alumina-supported iron-oxide catalysts were measured using coulometric titration and then compared to their activity for the water-gas shift (WGS) reaction. For the supported iron oxide catalysts with weight loadings of 5–30 wt%, the Gibbs free energy for the phase transition between Fe2O3 and Fe3O4 decreased by factor of two compared to that for bulk, unsupported iron oxide. This difference in thermodynamic properties was also found to affect the WGS reaction rates, with the rates on the supported catalysts being an order of magnitude lower than that for bulk iron oxide. We propose that the differences in the thermodynamic properties of the supported and unsupported catalysts are due to lattice strain in the supported iron oxide resulting from interactions at the FeOx-support interface.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Iron oxide; Water-gas shift; Thermodynamic properties
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The effect of thermodynamic properties of zirconia-supported Fe3O4 on water-gas shift activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 356, Issue 2, 15 March 2009, Pages 225–230
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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