Redox-mediated C-C bond scission in alcohols adsorbed on CeO2-xthin films

Lykhach Y, Johánek V, Neitzel A, Skála T, Tsud N, Beranová K, Mysliveček J, Brummel O, Libuda J (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 34

Journal Issue: 19

DOI: 10.1088/1361-648X/ac5138

Abstract

The decomposition mechanisms of ethanol and ethylene glycol on well-ordered stoichiometric CeO2(111) and partially reduced CeO2-x(111) films were investigated by means of synchrotron radiation photoelectron spectroscopy, resonant photoemission spectroscopy, and temperature programmed desorption. Both alcohols partially deprotonate upon adsorption at 150 K and subsequent annealing yielding stable ethoxy and ethylenedioxy species. The C-C bond scission in both ethoxy and ethylenedioxy species on stoichiometric CeO2(111) involves formation of acetaldehyde-like intermediates and yields CO and CO2accompanied by desorption of acetaldehyde, H2O, and H2. This decomposition pathway leads to the formation of oxygen vacancies. In the presence of oxygen vacancies, C-O bond scission in ethoxy species yields C2H4. In contrast, C-C bond scission in ethylenedioxy species on the partially reduced CeO2-x(111) is favored with respect to C-O bond scission and yields methanol, formaldehyde, and CO accompanied by the desorption of H2O and H2. Still, scission of C-O bonds on both sides of the ethylenedioxy species yields minor amounts of accompanying C2H4and C2H2. C-O bond scission is coupled with a partial recovery of the lattice oxygen in competition with its removal in the form of water.

Authors with CRIS profile

Involved external institutions

Univerzita Karlova v Praze / Charles University in Prague Czech Republic (CZ)

How to cite

APA:

Lykhach, Y., Johánek, V., Neitzel, A., Skála, T., Tsud, N., Beranová, K.,... Libuda, J. (2022). Redox-mediated C-C bond scission in alcohols adsorbed on CeO2-xthin films. Journal of Physics: Condensed Matter, 34(19). https://dx.doi.org/10.1088/1361-648X/ac5138

MLA:

Lykhach, Yaroslava, et al. "Redox-mediated C-C bond scission in alcohols adsorbed on CeO2-xthin films." Journal of Physics: Condensed Matter 34.19 (2022).

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