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Complex interplay of structural and surface properties of ceria on platinum supported catalyst under water gas shift reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
45499 46413 2016 13 PDF Available
Title
Complex interplay of structural and surface properties of ceria on platinum supported catalyst under water gas shift reaction
Abstract

•Ceria-promoted Pt/Al2O3 catalysts were produced from Pt nanoparticles.•The effect of structural properties of CeO2 was evaluated.•12 and 20% Ce loadings and preparation method lead to different CeOx species.•Presence of cerium in PtAl catalysts increases up to seven times the reaction rates.•The creation of PtOCe interfacial sites seems to be the limiting fator.

Catalysts using platinum pre-formed nanoparticles were prepared as a strategy to evaluate the impact of structural and electronic properties of ceria-alumina-supports in the water gas shift reaction, minimizing variations of the metallic phase among samples. Promoted cerium Pt/Al2O3 catalysts, with 12 or 20 wt% of CeO2, were prepared by adding cerium precursor during the sol-gel synthesis of Al2O3 (GEL samples) or by impregnating it on the Al2O3 support (IMP samples). The presence of cerium in PtAl catalysts increases up to seven times the reaction rates and although the results showed significant impact of the preparation method on the structural and surface properties of ceria, the main dependence of the catalytic activity seems to be with the cerium loading. The results suggest the participation of interfacial PtOCe sites as the crucial contribution to the significant increases of specific reaction rate.

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Keywords
Platinum supported catalysts; Ceria; Water-gas shift reaction; Structural properties
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Complex interplay of structural and surface properties of ceria on platinum supported catalyst under water gas shift reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 197, 15 November 2016, Pages 73–85
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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