Raman spectroscopy as a powerful tool to characterize ceria-based catalysts

[Display omitted] •Review on advanced Raman characterization of ceria based catalysts.•Spectral modifications induced by nanocrystallinity, defects, doping and reduction.•Identification of supported molecular species, isolated atoms, nanoclusters.•Characterization of surface modes, of peroxo, supero...

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Bibliographic Details
Published in:Catalysis today 2021-08, Vol.373, p.98-111
Main Author: Loridant, Stéphane
Format: Article
Language:English
Subjects:
Catalysis
Ceria
Chemical Sciences
Heterogeneous catalyst
In situoperando
Nanomaterials
Raman spectroscopy
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Summary:[Display omitted] •Review on advanced Raman characterization of ceria based catalysts.•Spectral modifications induced by nanocrystallinity, defects, doping and reduction.•Identification of supported molecular species, isolated atoms, nanoclusters.•Characterization of surface modes, of peroxo, superoxo species and hydroxyl groups.•In situ and operando studies for environmental catalysis. A review. CeO2 is widely used and investigated as an oxide catalyst or support due to its unique redox property of oxygen storage and release. In this paper, the different opportunities offered by Raman spectroscopy for advanced characterization of ceria-based catalysts are reviewed: spectral modifications induced by nanocrystallinity, defects, doping and reduction, identification of supported molecular species, isolated atoms and nanoclusters, characterization of surface modes, hydroxyl groups, reaction intermediates such as peroxo and superoxo species. Finally, in situ/operando studies for environmental catalysis are summarized illustrating Raman spectroscopy as a powerful tool to characterize ceria-based catalysts.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2020.03.044