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Nanosized gold catalysts supported on ceria and ceria-alumina for WGS reaction: Influence of the preparation method

Paper ID Volume ID Publish Year Pages File Format Full-Text
43893 45994 2007 8 PDF Available
Title
Nanosized gold catalysts supported on ceria and ceria-alumina for WGS reaction: Influence of the preparation method
Abstract

Gold supported catalysts on ceria-alumina, prepared by different methods have been studied in the WGS reaction. For the synthesis of the mixed ceria-alumina support two methods were applied—a new method of mechanochemical activation and well known ceria washcoating on alumina. Gold catalysts on ceria-alumina, prepared by mechanochemical activation show a high and stable WGS activity. A correlation between redox activity of the catalysts, estimated by TPR and the catalytic activity of the samples was observed. The introducing of alumina to ceria by mechanochemical activation causes formation of oxygen vacancies, located mainly on the catalyst surface. In the freshly prepared catalysts an optimum between a part of positively charged nano-gold particles, Ce3+ and oxygen vacancies should be the crucial factor for the good performance of WGS catalysts. In the course of redox reaction the active complex is being changed because of the electron transfer between gold and ceria through oxygen vacancies. A positive effect of alumina on the catalysts stability with respect to avoiding gold and ceria particles agglomeration was confirmed, as well.

Graphical abstractGold supported catalysts on ceria-alumina, prepared by different methods have been studied in the WGS reaction. Gold catalysts on ceria-alumina, prepared by mechanochemical activation show a high and stable WGS activity. A correlation between redox and catalytic activity was observed. The introducing of alumina to ceria by mechanochemical activation causes formation of oxygen vacancies, located mainly on the catalyst surface. A positive effect of alumina on the catalysts stability was established.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Nanosized gold and ceria; Ceria-alumina; Mechanochemical activation; WGS
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Nanosized gold catalysts supported on ceria and ceria-alumina for WGS reaction: Influence of the preparation method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 333, Issue 2, 15 December 2007, Pages 153–160
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