Abstract
The interaction of CO with ceria under conditions typically used to measure the oxygen storage capacity (OSC) of automotive three way catalysts (TWC) has been investigated by in situ Raman spectroscopy. During exposure of the ceria to CO at 623 K vibrational bands at 1582–1600 and 1331–1340 cm−1 appeared; these bands increased with increasing time of exposure to CO. The band positions are consistent with phonon modes of carbon; however, assignment to carboxylate species or carbonate species cannot be excluded. Subsequent exposure to O2 at room temperature resulted in a decrease in the intensities of the 1582–1600 and 1331–1340 cm−1 bands by more than 90%. As well, exposure to O2 at room temperature also resulted in the appearance of Raman modes characteristic of formate and peroxide surface species. The mechanism by which formate forms upon room temperature O2 exposure is discussed in the context of the assignment of the 1582–1600 and 1331–1340 cm−1 bands to carbon phonon modes which result from the disproportionation of CO on reduced ceria.
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Acknowledgments
Support from the Petroleum Research Fund (grant No PRF 39801 AC5S) of the American Chemical Society and the Coordinating Research Council (Grant No E-7a-3) is gratefully acknowledged. Additionally, J. L. d’Itri would like to thank Dr. Thomas H. Vanderspurt of United Technology Research Center for many helpful scientific discussions.
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Swanson, M., Pushkarev, V.V., Kovalchuk, V.I. et al. The dynamic surface chemistry during the interaction of CO with ceria captured by Raman spectroscopy. Catal Lett 116, 41–45 (2007). https://doi.org/10.1007/s10562-007-9087-8
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DOI: https://doi.org/10.1007/s10562-007-9087-8