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An FTIR study of the dispersed Ni species on Ni-YSZ catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43091 45954 2009 7 PDF Available
Title
An FTIR study of the dispersed Ni species on Ni-YSZ catalysts
Abstract

IR spectroscopy of low temperature adsorbed CO and CO + NO has been used to characterize the surface species on a 5% Ni-YSZ catalyst. Dispersed surface Ni species are present on the fresh catalyst, essentially formed by Ni2+, although it is evident that these species are very easily reduced in very mild conditions to zerovalent atomic nickel. Reduction in stronger conditions gives rise to small Ni metal particles, which are however easily reoxidized to bivalent nickel. This work has demonstrated how elastic is the redox state of this catalyst. This is supposed to be a key properties explaining the behaviour of this catalyst in converting ethanol in the presence of water.

Graphical abstractIR spectroscopy of low temperature adsorbed CO and CO + NO has been used to characterize the surface of 5% Ni-YSZ catalyst. Dispersed surface Ni2+ species are present on the fresh catalyst, which are very easily reduced to zerovalent atomic nickel. Reduction in stronger conditions gives rise to small Ni metal particles, which are very easily reoxidized to bivalent nickel.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ni catalysts; Zirconia support; Yttria-stabilized zirconia; IR spectroscopy; CO adsorption; NO adsorption; Ethanol steam reforming; Steam reforming; Reduction; Reducibility
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An FTIR study of the dispersed Ni species on Ni-YSZ catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 353, Issue 1, 31 January 2009, Pages 137–143
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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