Lykhach Y, Staudt T, Streber R, Lorenz MPA, Bayer A, Steinrück HP, Libuda J (2010)
Publication Type: Journal article
Publication year: 2010
Original Authors: Lykhach Y., Staudt T., Streber R., Lorenz M.P.A., Bayer A., Steinrück H.-P., Libuda J.
Publisher: EDP Sciences: EPJ
Book Volume: 75
Pages Range: 89-100
Journal Issue: 1
DOI: 10.1140/epjb/e2010-00110-x
Novel multifunctional ceria based materials may show an improved performance in catalytic processes involving CO activation and reforming of hydrocarbons. Towards a more detailed understanding of the underlying surface chemistry, we have investigated CO activation on single crystal based ceria and magnesia/ceria model catalysts. All model systems are prepared starting from well-ordered and fully stoichiometric CeO (111) films on a Cu(111) substrate. Samples with different structure, oxidation state and compositions are generated, including CeO /Cu(111) (reduced), MgO/CeO /Cu(111) (reduced), mixed MgO-CeO /Cu(111) (stoichiometric), and mixed MgO-CeO /Cu(111) (reduced). The morphology of the model surfaces is characterized by means of scanning tunneling microscopy (STM), whereas the electronic structure and reactivity is probed by X-ray photoelectron spectroscopy (XPS). The experimental approach allows us to compare the reactivity of samples containing different types of Ce , Ce , and Mg ions towards CO at a sample temperature of 300 K. Briefly, we detect the formation of two CO -derived species, namely carbonate (CO ) and carboxylate (CO ) groups, on the surfaces of all investigated samples after exposure to CO at 300 K. In parallel to formation of the carbonate species, slow partial reoxidation of reduced CeO /Cu(111) occurs at large doses of CO . The reoxidation of the reduced ceria is largely suppressed on MgO-containing samples. The tendency for reoxidation of Ce to Ce by CO decreases with increasing degree of intermixing between MgO and CeO . Additionally, we have studied the stability of the formed carbonate species as a function of annealing temperature. © 2010 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
APA:
Lykhach, Y., Staudt, T., Streber, R., Lorenz, M.P.A., Bayer, A., Steinrück, H.-P., & Libuda, J. (2010). CO2 activation on single crystal based ceria and magnesia/ceria model catalysts. European Physical Journal B, 75(1), 89-100. https://doi.org/10.1140/epjb/e2010-00110-x
MLA:
Lykhach, Yaroslava, et al. "CO2 activation on single crystal based ceria and magnesia/ceria model catalysts." European Physical Journal B 75.1 (2010): 89-100.
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