In-situ IR spectroscopy as a probe of oxidation/reduction of Ce in nanostructured CeO 2

Weiqiang Wu, Louisa Marie Savereide, Justin Notestein, Eric Weitz*

*Corresponding author for this work

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

5 Scopus citations

Abstract

The redox properties of CeO 2 are crucial in its applications in a wide range of catalytic processes. In the present research, in-situ IR spectroscopy is shown to be a viable and convenient method for the characterization of the oxidation state of Ce by monitoring the spin-orbit transition in Ce 3+ ( 2 F 5/2 → 2 F 7/2 ) at ∼2147 cm −1 . By monitoring this transition in CeO 2 nanorods, the apparent activation energy for the production of oxygen vacancies that accompany the formation of Ce 3+ has been determined and is shown to be lower for reduction with cyclohexene than with hydrogen. The bi-exponential kinetics for the formation of oxygen vacancies in CeO 2 nanorods is discussed. An application of this method to real time monitoring of the oxidation state of Ce in the oxidation of cyclohexene on vanadia supported on ceria is presented as an example of how this method can be used as an operando probe of reaction mechanisms.

Original languageEnglish (US)
Pages (from-to)548-554
Number of pages7
JournalApplied Surface Science
Volume445
DOIs
StatePublished - Jul 1 2018

Keywords

  • Ce
  • IR spectroscopy
  • Kinetics
  • Nanostructured CeO
  • Oxygen vacancies

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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