A Parametric Study of the Crystal Phases on Au/TiO2 Photocatalysts for CO2 Gas-Phase Reduction in the Presence of Water

Clément Marchal; Caroline Mary; Leila Hammoud; Qingyang Xi; Joumana Toufaily; Tayssir Hamieh; Luka Suhadolnik; Paolo Fornasiero; Christophe Colbeau-Justin; Valérie Caps; Thomas Cottineau; Valérie Keller

doi:10.3390/catal12121623

Catalysts (Dec 2022)

A Parametric Study of the Crystal Phases on Au/TiO2 Photocatalysts for CO2 Gas-Phase Reduction in the Presence of Water

Clément Marchal,
Caroline Mary,
Leila Hammoud,
Qingyang Xi,
Joumana Toufaily,
Tayssir Hamieh,
Luka Suhadolnik,
Paolo Fornasiero,
Christophe Colbeau-Justin,
Valérie Caps,
Thomas Cottineau,
Valérie Keller

Affiliations

Clément Marchal: ICPEES—Institute of Chemistry and Processes for Energy, Environment and Health, UMR 7515, CNRS/University of Strasbourg, 25, Rue Becquerel, CEDEX 2, 67087 Strasbourg, France
Caroline Mary: ICPEES—Institute of Chemistry and Processes for Energy, Environment and Health, UMR 7515, CNRS/University of Strasbourg, 25, Rue Becquerel, CEDEX 2, 67087 Strasbourg, France
Leila Hammoud: ICPEES—Institute of Chemistry and Processes for Energy, Environment and Health, UMR 7515, CNRS/University of Strasbourg, 25, Rue Becquerel, CEDEX 2, 67087 Strasbourg, France
Qingyang Xi: ICPEES—Institute of Chemistry and Processes for Energy, Environment and Health, UMR 7515, CNRS/University of Strasbourg, 25, Rue Becquerel, CEDEX 2, 67087 Strasbourg, France
Joumana Toufaily: Laboratory of Materials, Catalysis, Environment and Analytical Methods Laboratory (MCEMA), Faculty of Sciences, Lebanese University, Hadath P.O. Box 11-2806, Lebanon
Tayssir Hamieh: Laboratory of Materials, Catalysis, Environment and Analytical Methods Laboratory (MCEMA), Faculty of Sciences, Lebanese University, Hadath P.O. Box 11-2806, Lebanon
Luka Suhadolnik: Department of Chemical and Pharmaceutical Sciences, INSTM and ICCOM-CNR Research Units, University of Trieste, via L. Giorgieri 1, 34127 Trieste, Italy
Paolo Fornasiero: Department of Chemical and Pharmaceutical Sciences, INSTM and ICCOM-CNR Research Units, University of Trieste, via L. Giorgieri 1, 34127 Trieste, Italy
Christophe Colbeau-Justin: ICP, Institut de Chimie Physique, CNRS UMR 8000, Université Paris-Saclay, Bâtiment 349, CEDEX, 91405 Orsay, France
Valérie Caps: ICPEES—Institute of Chemistry and Processes for Energy, Environment and Health, UMR 7515, CNRS/University of Strasbourg, 25, Rue Becquerel, CEDEX 2, 67087 Strasbourg, France
Thomas Cottineau: ICPEES—Institute of Chemistry and Processes for Energy, Environment and Health, UMR 7515, CNRS/University of Strasbourg, 25, Rue Becquerel, CEDEX 2, 67087 Strasbourg, France
Valérie Keller: ICPEES—Institute of Chemistry and Processes for Energy, Environment and Health, UMR 7515, CNRS/University of Strasbourg, 25, Rue Becquerel, CEDEX 2, 67087 Strasbourg, France

DOI: https://doi.org/10.3390/catal12121623
Journal volume & issue: Vol. 12, no. 12
p. 1623

Abstract

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Au/TiO2 photocatalysts were studied, characterized, and compared for CO2 photocatalytic gas-phase reduction. The impact of the nature of the TiO2 support was studied. It was shown that the surface area/porosity/TiO2 crystal phase/density of specific exposed facets and oxygen vacancies were the key factors determining CH4 productivity under solar-light activation. A 0.84 wt.% Au/TiO2 SG (Sol Gel) calcined at 400 °C exhibited the best performance, leading to a continuous mean CH4 production rate of 50 μmol.h−1.g−1 over 5 h, associated with an electronic selectivity of 85%. This high activity was mainly attributed to the large surface area and accessible microporous volume, high density of exposed TiO2 (101) anatase facets, and oxygen vacancies acting as reactive defects sites for CO2 adsorption/activation/dissociation and charge carrier transport.

Published in Catalysts

ISSN: 2073-4344 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Chemical technology; Science: Chemistry
Website: https://www.mdpi.com/journal/catalysts

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