Abstract
The effects of different oxygen species and vacancies on the adsorption and oxidation of formaldehyde over CeO 2(1 1 1) surface were systematically investigated by using density functional theory (DFT) method. On the stoichiometric CeO 2(1 1 1) surface, the C–H bond rupture barriers of chemisorbed formaldehyde are much higher than that of formaldehyde desorption. On the reduced CeO 2(1 1 1) surface, the energy barriers of C–H bond ruptures are less than those on the stoichiometric CeO 2(1 1 1) surface. If the C–H bond rupture occurs, CO and H 2 form quickly with low energy barriers. When O 2 adsorbs on the reduced (1 1 1) surface (O 2/O v species), the C–H bond rupture barriers of formaldehyde are greatly reduced in comparison with those on the stoichiometric CeO 2(1 1 1) surface. If O 2 adsorbs on oxygen vacancy at sub-layer surface, its oxidative roles on formaldehyde are much similar to that of O 2/O v species.
Published Version
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