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 languageEnglish (US)
Pages (from-to)2-8
Number of pages7
JournalCatalysis Today
Volume180
Issue number1
DOIs
StatePublished - Jan 17 2012

Fingerprint

Cerium compounds
Hydrogen
Praseodymium
Nickel
Nanoparticles
Surface diffusion
Amorphization
Phase boundaries
Oxides
Gases
Oxygen
Transmission electron microscopy
Defects

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Direct observation of hydrogen spillover in Ni-loaded Pr-doped ceria. / Sharma, Vaneet; Crozier, Peter; Sharma, Renu; Adams, James.

In: Catalysis Today, Vol. 180, No. 1, 17.01.2012, p. 2-8.

Research output: Contribution to journalArticle

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