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Preparing Alumina-Supported Gold Nanowires for Alcohol Oxidation

[Image: see text] The development of shape-controlled noble metal nanocrystals such as nanowires (NWs) is progressing steadily owing to their potentially novel catalytic properties and the ease with which they can be prepared by reducing the metal ions in a particular solution as capping agents. Rec...

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Autores principales: Imura, Yoshiro, Maniwa, Motoki, Iida, Kazuki, Saito, Haruna, Morita-Imura, Clara, Kawai, Takeshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8223421/
https://www.ncbi.nlm.nih.gov/pubmed/34179649
http://dx.doi.org/10.1021/acsomega.1c01895
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author Imura, Yoshiro
Maniwa, Motoki
Iida, Kazuki
Saito, Haruna
Morita-Imura, Clara
Kawai, Takeshi
author_facet Imura, Yoshiro
Maniwa, Motoki
Iida, Kazuki
Saito, Haruna
Morita-Imura, Clara
Kawai, Takeshi
author_sort Imura, Yoshiro
collection PubMed
description [Image: see text] The development of shape-controlled noble metal nanocrystals such as nanowires (NWs) is progressing steadily owing to their potentially novel catalytic properties and the ease with which they can be prepared by reducing the metal ions in a particular solution as capping agents. Recently, many reports have been presented on the preparation of shape-controlled Au nanocrystals, such as nanostars and nanoflowers, by a one-pot method using 2-[4-(2-hydroxyethyl)-1-piperazinyl] ethanesulfonic acid (HEPES) as capping and reducing agents. The catalytic activity is depressed due to the adsorption of the capping agent onto a Au surface. Since HEPES has low binding affinities on the Au surface, shape-controlled nanocrystals obtained using HEPES are effective for application as nanocatalysts because HEPES was easily removed from the Au surface. In this study, we report the preparation of AuNWs, with an average diameter of 7.7 nm and lengths of a few hundred nanometers, in an aqueous solution containing HEPES and sodium borohydride. A γ-Al(2)O(3)-supported AuNW (AuNW/γ-Al(2)O(3)) catalyst was obtained using catalytic supporters and a water extraction method that removed HEPES from the Au surface without morphological changes. AuNW/γ-Al(2)O(3) was then utilized to catalyze the oxidation of 1-phenylethyl alcohol to acetophenone. The formation rate of acetophenone over AuNW/γ-Al(2)O(3) was 3.2 times that over γ-Al(2)O(3)-supported spherical Au nanoparticles (AuNP/γ-Al(2)O(3)) with almost the same diameter.
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spelling pubmed-82234212021-06-25 Preparing Alumina-Supported Gold Nanowires for Alcohol Oxidation Imura, Yoshiro Maniwa, Motoki Iida, Kazuki Saito, Haruna Morita-Imura, Clara Kawai, Takeshi ACS Omega [Image: see text] The development of shape-controlled noble metal nanocrystals such as nanowires (NWs) is progressing steadily owing to their potentially novel catalytic properties and the ease with which they can be prepared by reducing the metal ions in a particular solution as capping agents. Recently, many reports have been presented on the preparation of shape-controlled Au nanocrystals, such as nanostars and nanoflowers, by a one-pot method using 2-[4-(2-hydroxyethyl)-1-piperazinyl] ethanesulfonic acid (HEPES) as capping and reducing agents. The catalytic activity is depressed due to the adsorption of the capping agent onto a Au surface. Since HEPES has low binding affinities on the Au surface, shape-controlled nanocrystals obtained using HEPES are effective for application as nanocatalysts because HEPES was easily removed from the Au surface. In this study, we report the preparation of AuNWs, with an average diameter of 7.7 nm and lengths of a few hundred nanometers, in an aqueous solution containing HEPES and sodium borohydride. A γ-Al(2)O(3)-supported AuNW (AuNW/γ-Al(2)O(3)) catalyst was obtained using catalytic supporters and a water extraction method that removed HEPES from the Au surface without morphological changes. AuNW/γ-Al(2)O(3) was then utilized to catalyze the oxidation of 1-phenylethyl alcohol to acetophenone. The formation rate of acetophenone over AuNW/γ-Al(2)O(3) was 3.2 times that over γ-Al(2)O(3)-supported spherical Au nanoparticles (AuNP/γ-Al(2)O(3)) with almost the same diameter. American Chemical Society 2021-06-13 /pmc/articles/PMC8223421/ /pubmed/34179649 http://dx.doi.org/10.1021/acsomega.1c01895 Text en © 2021 The Authors. Published by American Chemical Society Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Imura, Yoshiro
Maniwa, Motoki
Iida, Kazuki
Saito, Haruna
Morita-Imura, Clara
Kawai, Takeshi
Preparing Alumina-Supported Gold Nanowires for Alcohol Oxidation
title Preparing Alumina-Supported Gold Nanowires for Alcohol Oxidation
title_full Preparing Alumina-Supported Gold Nanowires for Alcohol Oxidation
title_fullStr Preparing Alumina-Supported Gold Nanowires for Alcohol Oxidation
title_full_unstemmed Preparing Alumina-Supported Gold Nanowires for Alcohol Oxidation
title_short Preparing Alumina-Supported Gold Nanowires for Alcohol Oxidation
title_sort preparing alumina-supported gold nanowires for alcohol oxidation
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8223421/
https://www.ncbi.nlm.nih.gov/pubmed/34179649
http://dx.doi.org/10.1021/acsomega.1c01895
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