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Direct observation of hydrogen spillover in Ni-loaded Pr-doped ceria ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
55582 47058 2012 7 PDF Available
Title
Direct observation of hydrogen spillover in Ni-loaded Pr-doped ceria ☆
Abstract

In situ studies on reduction processes in praseodymium-doped ceria and nickel-loaded doped ceria nanoparticles have been investigated using environmental transmission electron microscopy. The presence of pit-like defects on the oxide nanoparticles resulted in amorphization during reduction. Hydrogen-spillover in nickel-loaded praseodymium-doped ceria (PDC) was directly observed. Localized reduction of ceria in a H2 atmosphere was observed and attributed to gas–nickel–ceria interactions at the three-phase boundary. The spatial extent of the localized reduction zones was experimentally determined. The spillover mechanism is discussed in terms of surface diffusion properties of atomic hydrogen and oxygen species.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (407 K)Download as PowerPoint slideHighlights► Reduction processes in Pr-doped ceria and Ni-loaded doped ceria nanoparticles. ► Pit-like defects give amorphization during reduction. ► Hydrogen-spillover in Ni-loaded Pr-doped ceria (PDC) was directly observed. ► The spatial extent of the localized reduction zones was experimentally determined.

Keywords
In situ; Pr-doped ceria; Reduction zone; Hydrogen-spillover; TEM
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Direct observation of hydrogen spillover in Ni-loaded Pr-doped ceria ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 180, Issue 1, 17 January 2012, Pages 2–8
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