Inspired by the report that oxides, and in particular ceria may be used as hydrogenation catalysts, depending on the degree of reduction, we have started surface science studies on well-defined CeO<sub>2</sub>(111) films grown on a Ru(0001) single crystal metal surface and studied the interaction of a fully oxidized ceria surface in comparison with a partially reduced surface with respect to its interaction with hydrogen from the gas phase. A number of different surface science analytical techniques are applied, including X-ray photoelectron spectroscopy, temperature programmed desorption, electron energy loss spectroscopy and infrared reflection absorption spectroscopy. We will show that a hydride is formed in the sub-surface region in the case of reduced ceria leading to a re-oxidation of the ceria sublattice. Also, the interaction with propyne, both, regular and isotopically labelled with the ceria surface has been studied. The consequences for hydrogenation reactions will be discussed.

Hydrogen on and in ceria and hydrogenation of unsaturated hydrocarbons

ACS Fall 2020 Virtual Meeting

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