Manuscript - accpeted article.pdf (1.4 MB)
Homocoupling of phenylboronic acid using atomically dispersed gold on carbon catalysts: Catalyst evolution before reaction
journal contribution
posted on 2018-04-04, 12:05 authored by Tanja E. Parmentier, Simon R. Dawson, Grazia Malta, Li Lu, Thomas E. Davies, Simon KondratSimon Kondrat, Simon J. Freakley, Christopher J. Kiely, Graham J. HutchingsCoupling reactions to form new C-C bonds are extensively used in industrial synthetic processes. Gold has been shown to be an active catalyst for such reactions; however, conflicting reports exist as to whether cationic Au or metallic Au acts as the active species. We prepared a heterogeneous catalyst consisting of atomically dispersed Au-Cl x supported on carbon and showed this to be active in the homocoupling of phenylboronic acid to biphenyl. However; characterisation of the catalyst materials, even after just a short exposure time to the reactants, revealed rapid reduction and sintering of the Au species into larger metallic nanoparticles, which we propose to be the true active species in this instance. This study suggests that if cationic Au is an active catalyst, it must be stabilised against reduction and agglomeration by either forming complexes which are more stable than common chlorides or by strongly anchoring them firmly onto alternative support materials; as in this case the carbon supported Au-Cl species were easily reduced.
Funding
MaxNet Energy
History
School
- Science
Department
- Chemistry
Published in
ChemCatChemCitation
PARMENTIER, T.E. ... et al, 2018. Homocoupling of phenylboronic acid using atomically dispersed gold on carbon catalysts: Catalyst evolution before reaction. ChemCatChem, 10(8), pp. 1853-1859.Publisher
© WileyVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2018Notes
This is the peer reviewed version of the following article: PARMENTIER, T.E. ... et al, 2018. Homocoupling of phenylboronic acid using atomically dispersed gold on carbon catalysts: Catalyst evolution before reaction. ChemCatChem, 10(8), pp. 1853-1859, which has been published in final form at https://doi.org/10.1002/cctc.201701840. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.ISSN
1867-3880eISSN
1867-3899Publisher version
Language
- en