A bifunctional catalyst for the single-stage water–gas shift reaction in fuel cell applications. Part 2. Roles of the support and promoter on catalyst activity and stability

Azzam, K.G. and Babich, I.V. and Seshan, K. and Lefferts, L. (2007) A bifunctional catalyst for the single-stage water–gas shift reaction in fuel cell applications. Part 2. Roles of the support and promoter on catalyst activity and stability. Journal of Catalysis, 251 (1). pp. 163-171. ISSN 0021-9517

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Abstract:	The nature of oxide supports has a crucial effect on the performance of Pt-based catalysts in the water–gas shift reaction. Supports not only determine the activity of the catalyst, but also influence their stability (deactivation mechanism). Among the catalysts studied, Pt/TiO2 was the most active. Pt/CeO2 deactivated with time due to the formation of stable carbonate on the ceria surface. Sintering of Pt was found to be the cause of Pt/TiO2 deactivation. Using mixed oxides as catalyst supports did not improve the activity despite the better red–ox properties of mixed oxides compared with the single-oxide supports. Pt/TiO2 could be stabilized by adding a second metal (Re), which prevented Pt sintering. In addition, Pt–Re/TiO2 was more active than Pt/TiO2. Under WGS conditions, part of the Re was present in oxidizing form (ReOx); we speculate that this helped improve the catalyst activity.
Item Type:	Article
Copyright:	© 2007 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Catalytic Processes and Materials (CPM)
Link to this item:	http://purl.utwente.nl/publications/78815
Official URL:	http://dx.doi.org/10.1016/j.jcat.2007.07.011
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