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Issue 23, 2013
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Mechanism of NO2 storage in ceria studied using combined in situ Raman/FT-IR spectroscopy

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Abstract

In situ Raman spectroscopy combined with quantitative FT-IR gas phase analysis was used to elucidate the mechanism of NO2 storage in ceria. At room temperature, NO2 exposure induces an immediate increase in the degree of ceria reduction accompanying nitrate formation. Two parallel reaction pathways for nitrate formation are identified. The presence of steam strongly influences the storage behavior by favoring the formation of free nitrates over bidentate/bridging nitrates. At 200°, faster free nitrate formation and gas phase NO formation is observed, while the NOx storage capacity of ceria is reduced from 0.27 to 0.16 mmol g−1 CeO2.

Graphical abstract: Mechanism of NO2 storage in ceria studied using combined in situ Raman/FT-IR spectroscopy

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Publication details

The article was received on 05 Apr 2013, accepted on 26 Apr 2013 and first published on 26 Apr 2013


Article type: Communication
DOI: 10.1039/C3CP51441B
Citation: Phys. Chem. Chem. Phys., 2013,15, 9066-9069
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    Mechanism of NO2 storage in ceria studied using combined in situ Raman/FT-IR spectroscopy

    A. Filtschew, D. Stranz and C. Hess, Phys. Chem. Chem. Phys., 2013, 15, 9066
    DOI: 10.1039/C3CP51441B

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