Abstract
A series of ceria-supported iron and cobalt oxide catalysts were synthesized with incremental metal loadings to determine within a narrow range the monolayer surface coverage. Onset of monolayer formation was monitored utilizing X-ray diffraction and Raman spectroscopy to identify the presence of microcrystalline Fe–oxide and Co–oxide phases. Formation of Fe2O3 and Co3O4 microcrystalline phases was found on the 5.40 Fe/nm2 FeOx/CeO2 and 2.58 Co/nm2 CoOx/CeO2 catalysts, respectively, and thus those surface densities approximate the monolayer coverage. The surface sensitivity of this approach was confirmed by corroborating the results with surface characterization by X-ray photoelectron spectroscopy. Catalytic activity testing was performed to illustrate the importance of establishing the monolayer coverage of each independent ceria-supported oxide system, that is, maximizing the number of metal–oxygen–support interfacial bonds. Steady-state activities for reduction of NO by CO in the presence of a stoichio...
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