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Au-mixed lanthanum/cerium oxide catalysts for water gas shift

Paper ID Volume ID Publish Year Pages File Format Full-Text
47214 46464 2010 7 PDF Available
Title
Au-mixed lanthanum/cerium oxide catalysts for water gas shift
Abstract

We report on the synthesis of highly homogeneous mixed La/Ce-oxides via a microemulsion-templated approach, and their evaluation as active supports for Au in the water gas shift (WGS) reaction. Both structure and reducibility of the oxides could be tailored by adjusting the La content across the entire range of La:Ce-ratios. The reducibility of the Au-free oxides shows an optimum at ∼25% La content, which can be traced back to improved oxygen mobility due to formation of oxygen vacancies and to the formation of more strongly bound oxygen upon La addition.Deposition of Au onto these oxides gives rise to an additional, low-temperature reduction peak, presumably due to hydrogen spill-over from the noble metal onto the oxide support. The WGS activity of Au/LaxCe1−xO2−0.5x catalysts correlates closely with the reducibility of the oxide supports, and hence with La content, demonstrating that carefully controlled synthesis of nanostructured catalysts with uniform, tailored composition allows for fine control of reactive properties of these materials, and might ultimately open the way towards a more rational design of catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Carefully controlled nanostructured lanathana/ceria mixed oxides were prepared for water-gas-shift (WGS). ▶ Reducibility of mixed oxides is controlled by La content. ▶ Optimum La content is traced back to balance between oxygen mobility and availability of reducible oxygen. ▶ WGS activity after Au deposition is strongly correlated with this reducibility.

Keywords
Water gas shift; Gold; Mixed La/Ce-oxide; Activity; Reducibility
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Au-mixed lanthanum/cerium oxide catalysts for water gas shift
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 99, Issues 1–2, 31 August 2010, Pages 89–95
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