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Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2

Atomically-precise gold clusters have gained attraction in catalysis due to high fraction of low-coordinated gold atoms, unique structural geometry and ligand effect. Phosphine-ligated gold clusters offer an advantage in the light of the labile gold-phosphorous bond for easy ligand removal. Here, he...

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Main Authors: Adnan, Rohul H., Golovko, Vladimir B.
Format: Article
Published: Springer New York LLC 2019
Subjects:
QD Chemistry
Online Access:http://eprints.utm.my/id/eprint/87644/
http://dx.doi.org/10.1007/s10562-018-2625-8
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spelling my.utm.876442020-11-30T09:06:33Z http://eprints.utm.my/id/eprint/87644/ Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2 Adnan, Rohul H. Golovko, Vladimir B. QD Chemistry Atomically-precise gold clusters have gained attraction in catalysis due to high fraction of low-coordinated gold atoms, unique structural geometry and ligand effect. Phosphine-ligated gold clusters offer an advantage in the light of the labile gold-phosphorous bond for easy ligand removal. Here, heterogeneous gold catalysts were prepared by depositing atomically-precise phosphine-ligated gold clusters, Au8(PPh3)8(NO3)2 onto anatase-phase TiO2 nanoparticles. The catalysts were then calcined under two different conditions: O2(Au8/TiO2:O2) and O2 followed by H2(Au8/TiO2:O2–H2) at 200°C, to dislodge phosphine ligands from the Au core. It was found that Au8/TiO2:O2–H2 catalyst showed a decent catalytic activity in benzyl alcohol oxidation while Au8/TiO2 and Au8/TiO2:O2 were completely inactive. Such results imply that small-size gold clusters (2–3nm) alone do not always contribute to high catalytic activity of gold catalysts. It is suggested that the presence of NO3− species defines the catalytic activity of supported gold clusters in benzyl alcohol oxidation in the case of these catalysts and reinforces our initial claim in the previous work. Springer New York LLC 2019-02-15 Article PeerReviewed Adnan, Rohul H. and Golovko, Vladimir B. (2019) Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2. Catalysis Letters, 149 (2). pp. 449-455. ISSN 1011-372X http://dx.doi.org/10.1007/s10562-018-2625-8 DOI:10.1007/s10562-018-2625-8
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic QD Chemistry
spellingShingle QD Chemistry
Adnan, Rohul H.
Golovko, Vladimir B.
Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2
description Atomically-precise gold clusters have gained attraction in catalysis due to high fraction of low-coordinated gold atoms, unique structural geometry and ligand effect. Phosphine-ligated gold clusters offer an advantage in the light of the labile gold-phosphorous bond for easy ligand removal. Here, heterogeneous gold catalysts were prepared by depositing atomically-precise phosphine-ligated gold clusters, Au8(PPh3)8(NO3)2 onto anatase-phase TiO2 nanoparticles. The catalysts were then calcined under two different conditions: O2(Au8/TiO2:O2) and O2 followed by H2(Au8/TiO2:O2–H2) at 200°C, to dislodge phosphine ligands from the Au core. It was found that Au8/TiO2:O2–H2 catalyst showed a decent catalytic activity in benzyl alcohol oxidation while Au8/TiO2 and Au8/TiO2:O2 were completely inactive. Such results imply that small-size gold clusters (2–3nm) alone do not always contribute to high catalytic activity of gold catalysts. It is suggested that the presence of NO3− species defines the catalytic activity of supported gold clusters in benzyl alcohol oxidation in the case of these catalysts and reinforces our initial claim in the previous work.
format Article
author Adnan, Rohul H.
Golovko, Vladimir B.
author_facet Adnan, Rohul H.
Golovko, Vladimir B.
author_sort Adnan, Rohul H.
title Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2
title_short Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2
title_full Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2
title_fullStr Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2
title_full_unstemmed Benzyl alcohol oxidation using gold catalysts derived from Au8 clusters on TiO2
title_sort benzyl alcohol oxidation using gold catalysts derived from au8 clusters on tio2
publisher Springer New York LLC
publishDate 2019
url http://eprints.utm.my/id/eprint/87644/
http://dx.doi.org/10.1007/s10562-018-2625-8
_version_ 1685578967618158592
score 13.211869

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