Gold-indium modified TiO                         2                          nanocatalysts for photocatalytic CO                         2                          reduction with H                         2                          as reductant in a monolith photoreactor

Beenish Tahir; Muhammad Tahir; Noraishah Saidina Amin

doi:10.1016/j.apsusc.2015.02.126

Gold-indium modified TiO ₂ nanocatalysts for photocatalytic CO ₂ reduction with H ₂ as reductant in a monolith photoreactor

Beenish Tahir
, Muhammad Tahir
, Noraishah Saidina Amin^*

^*Corresponding author for this work

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

95 Scopus citations

Abstract

In this study, CO ₂ photoreduction via reverse water gas shift (RWGS) reaction over gold (Au) and indium (In) modified TiO ₂ nanocatalysts in a monolith photoreactor has been investigated. Crystalline nanoparticles of anatase TiO ₂ were obtained in doped TiO ₂ samples with metals deposited over TiO ₂ as Au and In ³⁺ ions. The catalytic performance of metal-doped/TiO ₂ catalysts was found to be considerably higher when compared to pure TiO ₂ . The maximum production of CO as the main product was 8982 μmol g-catal ^-1 h ^-1 at selectivity 99% and CO ₂ conversion of 9.5% over 0.2 wt.% Au-3.5 wt.% In/TiO ₂ , and CO ₂ /H ₂ feed ratio 1.5. The CO production over co-metals (Au-In) doped TiO ₂ monolithic catalyst was 1.3 times higher than Au/TiO ₂ , 4.39 times higher than In/TiO ₂ and 76 times higher than un-doped TiO ₂ catalysts. Significantly higher photoactivity of metal-doped TiO ₂ was obviously due to fast electron transfer with hindered recombination rates and larger illuminated surface area in monolith channels. The quantum efficiency of CO production through RWGS reaction using Au-In/TiO ₂ catalyst was considerably improved (0.79%) than Au/TiO ₂ (0.53%) and In/TiO ₂ (0.14%) monolithic catalysts. The stability of the reused catalysts for CO production sustained at cyclic runs. This development confirmed higher performance of metals-doped TiO ₂ nanocatalysts supported over monolith channels for CO ₂ photoreduction via RWGS reaction.

Original language	English
Pages (from-to)	1-14
Number of pages	14
Journal	Applied Surface Science
Volume	338
DOIs	https://doi.org/10.1016/j.apsusc.2015.02.126
State	Published - 30 May 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 13 Climate Action

Keywords

CO photoreduction
Gold-indium-TiO
H reductant
Monolith photoreactor
RWGS reaction

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

Access to Document

10.1016/j.apsusc.2015.02.126

Cite this

Tahir, B., Tahir, M., & Amin, N. S. (2015). Gold-indium modified TiO ₂ nanocatalysts for photocatalytic CO ₂ reduction with H ₂ as reductant in a monolith photoreactor Applied Surface Science, 338, 1-14. https://doi.org/10.1016/j.apsusc.2015.02.126

Tahir, Beenish ; Tahir, Muhammad ; Amin, Noraishah Saidina. / Gold-indium modified TiO ₂ nanocatalysts for photocatalytic CO ₂ reduction with H ₂ as reductant in a monolith photoreactor In: Applied Surface Science. 2015 ; Vol. 338. pp. 1-14.

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title = " Gold-indium modified TiO 2 nanocatalysts for photocatalytic CO 2 reduction with H 2 as reductant in a monolith photoreactor ",

abstract = " In this study, CO 2 photoreduction via reverse water gas shift (RWGS) reaction over gold (Au) and indium (In) modified TiO 2 nanocatalysts in a monolith photoreactor has been investigated. Crystalline nanoparticles of anatase TiO 2 were obtained in doped TiO 2 samples with metals deposited over TiO 2 as Au and In 3+ ions. The catalytic performance of metal-doped/TiO 2 catalysts was found to be considerably higher when compared to pure TiO 2 . The maximum production of CO as the main product was 8982 μmol g-catal -1 h -1 at selectivity 99\% and CO 2 conversion of 9.5\% over 0.2 wt.\% Au-3.5 wt.\% In/TiO 2 , and CO 2 /H 2 feed ratio 1.5. The CO production over co-metals (Au-In) doped TiO 2 monolithic catalyst was 1.3 times higher than Au/TiO 2 , 4.39 times higher than In/TiO 2 and 76 times higher than un-doped TiO 2 catalysts. Significantly higher photoactivity of metal-doped TiO 2 was obviously due to fast electron transfer with hindered recombination rates and larger illuminated surface area in monolith channels. The quantum efficiency of CO production through RWGS reaction using Au-In/TiO 2 catalyst was considerably improved (0.79\%) than Au/TiO 2 (0.53\%) and In/TiO 2 (0.14\%) monolithic catalysts. The stability of the reused catalysts for CO production sustained at cyclic runs. This development confirmed higher performance of metals-doped TiO 2 nanocatalysts supported over monolith channels for CO 2 photoreduction via RWGS reaction.",

keywords = "CO photoreduction, Gold-indium-TiO, H reductant, Monolith photoreactor, RWGS reaction",

author = "Beenish Tahir and Muhammad Tahir and Amin, \{Noraishah Saidina\}",

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doi = "10.1016/j.apsusc.2015.02.126",

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Tahir, B, Tahir, M & Amin, NS 2015, ' Gold-indium modified TiO ₂ nanocatalysts for photocatalytic CO ₂ reduction with H ₂ as reductant in a monolith photoreactor ', Applied Surface Science, vol. 338, pp. 1-14. https://doi.org/10.1016/j.apsusc.2015.02.126

Gold-indium modified TiO ₂ nanocatalysts for photocatalytic CO ₂ reduction with H ₂ as reductant in a monolith photoreactor . / Tahir, Beenish; Tahir, Muhammad; Amin, Noraishah Saidina.
In: Applied Surface Science, Vol. 338, 30.05.2015, p. 1-14.

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

TY - JOUR

T1 - Gold-indium modified TiO 2 nanocatalysts for photocatalytic CO 2 reduction with H 2 as reductant in a monolith photoreactor

AU - Tahir, Beenish

AU - Tahir, Muhammad

AU - Amin, Noraishah Saidina

PY - 2015/5/30

Y1 - 2015/5/30

N2 - In this study, CO 2 photoreduction via reverse water gas shift (RWGS) reaction over gold (Au) and indium (In) modified TiO 2 nanocatalysts in a monolith photoreactor has been investigated. Crystalline nanoparticles of anatase TiO 2 were obtained in doped TiO 2 samples with metals deposited over TiO 2 as Au and In 3+ ions. The catalytic performance of metal-doped/TiO 2 catalysts was found to be considerably higher when compared to pure TiO 2 . The maximum production of CO as the main product was 8982 μmol g-catal -1 h -1 at selectivity 99% and CO 2 conversion of 9.5% over 0.2 wt.% Au-3.5 wt.% In/TiO 2 , and CO 2 /H 2 feed ratio 1.5. The CO production over co-metals (Au-In) doped TiO 2 monolithic catalyst was 1.3 times higher than Au/TiO 2 , 4.39 times higher than In/TiO 2 and 76 times higher than un-doped TiO 2 catalysts. Significantly higher photoactivity of metal-doped TiO 2 was obviously due to fast electron transfer with hindered recombination rates and larger illuminated surface area in monolith channels. The quantum efficiency of CO production through RWGS reaction using Au-In/TiO 2 catalyst was considerably improved (0.79%) than Au/TiO 2 (0.53%) and In/TiO 2 (0.14%) monolithic catalysts. The stability of the reused catalysts for CO production sustained at cyclic runs. This development confirmed higher performance of metals-doped TiO 2 nanocatalysts supported over monolith channels for CO 2 photoreduction via RWGS reaction.

AB - In this study, CO 2 photoreduction via reverse water gas shift (RWGS) reaction over gold (Au) and indium (In) modified TiO 2 nanocatalysts in a monolith photoreactor has been investigated. Crystalline nanoparticles of anatase TiO 2 were obtained in doped TiO 2 samples with metals deposited over TiO 2 as Au and In 3+ ions. The catalytic performance of metal-doped/TiO 2 catalysts was found to be considerably higher when compared to pure TiO 2 . The maximum production of CO as the main product was 8982 μmol g-catal -1 h -1 at selectivity 99% and CO 2 conversion of 9.5% over 0.2 wt.% Au-3.5 wt.% In/TiO 2 , and CO 2 /H 2 feed ratio 1.5. The CO production over co-metals (Au-In) doped TiO 2 monolithic catalyst was 1.3 times higher than Au/TiO 2 , 4.39 times higher than In/TiO 2 and 76 times higher than un-doped TiO 2 catalysts. Significantly higher photoactivity of metal-doped TiO 2 was obviously due to fast electron transfer with hindered recombination rates and larger illuminated surface area in monolith channels. The quantum efficiency of CO production through RWGS reaction using Au-In/TiO 2 catalyst was considerably improved (0.79%) than Au/TiO 2 (0.53%) and In/TiO 2 (0.14%) monolithic catalysts. The stability of the reused catalysts for CO production sustained at cyclic runs. This development confirmed higher performance of metals-doped TiO 2 nanocatalysts supported over monolith channels for CO 2 photoreduction via RWGS reaction.

KW - CO photoreduction

KW - Gold-indium-TiO

KW - H reductant

KW - Monolith photoreactor

KW - RWGS reaction

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M3 - Article

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Tahir B, Tahir M, Amin NS. Gold-indium modified TiO ₂ nanocatalysts for photocatalytic CO ₂ reduction with H ₂ as reductant in a monolith photoreactor Applied Surface Science. 2015 May 30;338:1-14. doi: 10.1016/j.apsusc.2015.02.126

Gold-indium modified TiO 2 nanocatalysts for photocatalytic CO 2 reduction with H 2 as reductant in a monolith photoreactor