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

Vaneet Sharma; Peter Crozier; Renu Sharma; James Adams

doi:10.1016/j.cattod.2011.09.009

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

Vaneet Sharma, Peter Crozier, Renu Sharma, James Adams

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

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 H ₂ 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.

Original language	English (US)
Pages (from-to)	2-8
Number of pages	7
Journal	Catalysis Today
Volume	180
Issue number	1
DOIs	https://doi.org/10.1016/j.cattod.2011.09.009
State	Published - Jan 17 2012

Keywords

Hydrogen-spillover
In situ
Pr-doped ceria
Reduction zone
TEM

ASJC Scopus subject areas

Catalysis
General Chemistry

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10.1016/j.cattod.2011.09.009

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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 H 2 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.",

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AU - Sharma, Vaneet

AU - Crozier, Peter

AU - Sharma, Renu

AU - Adams, James

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N2 - 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 H 2 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.

AB - 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 H 2 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.

KW - Hydrogen-spillover

KW - In situ

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KW - Reduction zone

KW - TEM

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

Abstract

Keywords

ASJC Scopus subject areas

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