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

C. Marchal; C. Mary; L. Hammoud; Q.Y. Xi; J. Toufaily; T. Hamieh; L. Suhadolnik; P. Fornasiero; C. Colbeau-Justin; V. Caps; T. Cottineau; V. Keller

doi:10.3390/catal12121623

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

C. Marchal^*, C. Mary, L. Hammoud, Q.Y. Xi, J. Toufaily, T. Hamieh, L. Suhadolnik, P. Fornasiero, C. Colbeau-Justin, V. Caps, T. Cottineau, V. Keller^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

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 degrees C exhibited the best performance, leading to a continuous mean CH4 production rate of 50 mu mol.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.

Original language	English
Article number	1623
Number of pages	17
Journal	Catalysts
Volume	12
Issue number	12
DOIs	https://doi.org/10.3390/catal12121623
Publication status	Published - 1 Dec 2022

Keywords

CH4 and H-2 production
CO2 photo-reduction
crystalline phases
titanium dioxide
OXYGEN VACANCY FORMATION
VISIBLE-LIGHT
GOLD CATALYSTS
DOPED TIO2
DIOXIDE
ANATASE
PHOTOREDUCTION
SELECTIVITY
POLYMORPHS
MECHANISM

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@article{fa56bfb4503d4e02b531bdebfd98c53a,

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

abstract = "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 degrees C exhibited the best performance, leading to a continuous mean CH4 production rate of 50 mu mol.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.",

keywords = "CH4 and H-2 production, CO2 photo-reduction, crystalline phases, titanium dioxide, OXYGEN VACANCY FORMATION, VISIBLE-LIGHT, GOLD CATALYSTS, DOPED TIO2, DIOXIDE, ANATASE, PHOTOREDUCTION, SELECTIVITY, POLYMORPHS, MECHANISM",

author = "C. Marchal and C. Mary and L. Hammoud and Q.Y. Xi and J. Toufaily and T. Hamieh and L. Suhadolnik and P. Fornasiero and C. Colbeau-Justin and V. Caps and T. Cottineau and V. Keller",

note = "Funding Information: This research was funded by the European Community, (projects H2020–LC–SC3-2019-NZE-RES-CC), grant agreement number 884444. Leila Hammoud wants to thank the « Centre Islamique d{\textquoteright}Orientation et de l{\textquoteright}Enseignement sup{\'e}rieur » (CIOES) for her PhD. fellowship. Qingyang Xi wants to thank the “China Scholarship Council” (CSC) for his PhD. fellowship (File N°: 201908410202). Publisher Copyright: {\textcopyright} 2022 by the authors.",

year = "2022",

month = dec,

day = "1",

doi = "10.3390/catal12121623",

language = "English",

volume = "12",

journal = "Catalysts",

issn = "2073-4344",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

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TY - JOUR

T1 - A Parametric Study of the Crystal Phases on Au/TiO2 Photocatalysts for CO2 Gas-Phase Reduction in the Presence of Water

AU - Marchal, C.

AU - Mary, C.

AU - Hammoud, L.

AU - Xi, Q.Y.

AU - Toufaily, J.

AU - Hamieh, T.

AU - Suhadolnik, L.

AU - Fornasiero, P.

AU - Colbeau-Justin, C.

AU - Caps, V.

AU - Cottineau, T.

AU - Keller, V.

N1 - Funding Information: This research was funded by the European Community, (projects H2020–LC–SC3-2019-NZE-RES-CC), grant agreement number 884444. Leila Hammoud wants to thank the « Centre Islamique d’Orientation et de l’Enseignement supérieur » (CIOES) for her PhD. fellowship. Qingyang Xi wants to thank the “China Scholarship Council” (CSC) for his PhD. fellowship (File N°: 201908410202). Publisher Copyright: © 2022 by the authors.

PY - 2022/12/1

Y1 - 2022/12/1

N2 - 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 degrees C exhibited the best performance, leading to a continuous mean CH4 production rate of 50 mu mol.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.

AB - 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 degrees C exhibited the best performance, leading to a continuous mean CH4 production rate of 50 mu mol.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.

KW - CH4 and H-2 production

KW - CO2 photo-reduction

KW - crystalline phases

KW - titanium dioxide

KW - OXYGEN VACANCY FORMATION

KW - VISIBLE-LIGHT

KW - GOLD CATALYSTS

KW - DOPED TIO2

KW - DIOXIDE

KW - ANATASE

KW - PHOTOREDUCTION

KW - SELECTIVITY

KW - POLYMORPHS

KW - MECHANISM

U2 - 10.3390/catal12121623

DO - 10.3390/catal12121623

M3 - Article

SN - 2073-4344

VL - 12

JO - Catalysts

JF - Catalysts

IS - 12

M1 - 1623

ER -