Controlled selectivity for ethanol steam reforming reaction over doped CeO2 surfaces: The role of gallium

Vecchietti J, Lustemberg P, Fornero EL, Calatayud M, Collins SE, Mohr S, Ganduglia-Pirovano MV, Libuda J, Bonivardi AL (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Applied Catalysis B-Environmental Elsevier

Book Volume: 277

Article Number: 119103

DOI: 10.1016/j.apcatb.2020.119103

Abstract

The ethanol steam reforming reaction, together with the adsorption and decomposition of ethanol was studied on CeO2 and gallium-doped ceria (CeGaOx) by a combined experimental and theoretical approach using infrared spectroscopy (IR), mass spectrometry (MS) and density functional theory (DFT) calculations. At 100 °C, different types of monodentate ethoxy species were identified as standing-up (SU) on Ce4+ and lying-down (LD) on Ce4+ and Ga3+, with the alkyl chain more perpendicular or parallel to the surface, respectively. It is suggested that the incorporation of Ga into the ceria lattice changes the decomposition pathway of LD species, which converts to acetate instead of ethylene, attributed to the increased lattice oxygen lability in the Ce[sbnd]O[sbnd]Ga interface upon doping and the propensity to form Ga[sbnd]H surface species. Under ethanol steam reforming conditions, Ga doping of ceria-based materials has a drastic effect by improving the H2:CO2 ratio, changing the product distribution and reducing coke formation.

Authors with CRIS profile

Susanne Mohr Lehrstuhl für Katalytische Grenzflächenforschung Jörg Libuda Lehrstuhl für Katalytische Grenzflächenforschung

Involved external institutions

National University of the Littoral / Universidad Nacional del Litoral (UNL) AR Argentina (AR) Instituto de Física Rosario AR Argentina (AR) Sorbonne Université FR France (FR) Instituto de Catálisis y Petroleoquímica (ICP) ES Spain (ES)

How to cite

APA:

Vecchietti, J., Lustemberg, P., Fornero, E.L., Calatayud, M., Collins, S.E., Mohr, S.,... Bonivardi, A.L. (2020). Controlled selectivity for ethanol steam reforming reaction over doped CeO2 surfaces: The role of gallium. Applied Catalysis B-Environmental, 277. https://dx.doi.org/10.1016/j.apcatb.2020.119103

MLA:

Vecchietti, Julia, et al. "Controlled selectivity for ethanol steam reforming reaction over doped CeO2 surfaces: The role of gallium." Applied Catalysis B-Environmental 277 (2020).

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