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Influence of the preparation method and dopants nature on the WGS activity of gold catalysts supported on doped by transition metals ceria

Paper ID Volume ID Publish Year Pages File Format Full-Text
46312 46437 2013 11 PDF Available
Title
Influence of the preparation method and dopants nature on the WGS activity of gold catalysts supported on doped by transition metals ceria
Abstract

Gold catalysts supported on ceria doped by different metal oxides (Me = Fe, Mn, Sn) were synthesized by two different methods: coprecipitation (CP) and mechanochemical activation (MA). Samples were characterized by means of XRD, HRTEM, TPR and XPS. Both XRD and HRTEM analyses reveal differences in the average size of the gold and ceria particles. As shown by TPR data, ceria doping improves oxygen mobility, i.e. a higher oxygen capacity was observed while compared with gold catalyst on undoped ceria. The method of preparation and the nature of dopant applied influence the catalytic performance in the water–gas shift (WGS) reaction. The differences in WGS activity between the MA and CP samples were significant. The MA catalysts, doped by Fe and Mn, manifested higher WGS activity than the undoped Au/ceria sample and the sample doped by Sn. A high concentration of Ce3+ ions in the highly active catalysts containing Fe or Mn was registered by XPS and found consistent with an earlier proposed model of the active sites for the WGS reaction.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Au catalysts on ceria doped by Fe, Mn or Sn ions were prepared by different methods. ► A higher WGS activity exhibited the catalysts prepared by mechanical mixing. ► High and stable activity of doped by Fe or Mn ceria-based catalysts was established. ► The different activity is due to the preparation method and to the nature of dopant.

Keywords
Gold catalysts; WGSR; Ceria doped by Fe, Mn and Sn oxides
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Influence of the preparation method and dopants nature on the WGS activity of gold catalysts supported on doped by transition metals ceria
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 136–137, 5 June 2013, Pages 70–80
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
100% Money Back Guarantee
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