PTFE supported gold nanoparticles as ...
Document type :
Compte-rendu et recension critique d'ouvrage
DOI :
Title :
PTFE supported gold nanoparticles as photocatalysts for oxidative esterification of aldehydes
Author(s) :
Penhoat, Maël [Auteur correspondant]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Vanbésien, T. [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Cocud, A. [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Addad, A. [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Rolando, C. [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]

Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Vanbésien, T. [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Cocud, A. [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Addad, A. [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Vezin, Herve [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Rolando, C. [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Journal title :
New Journal of Chemistry
Pages :
9460 - 9470
Publisher :
Royal Society of Chemistry [1987-....]
Publication date :
2016
ISSN :
1144-0546
HAL domain(s) :
Chimie/Chimie théorique et/ou physique
English abstract : [en]
Homogeneous, small gold nanoparticles (d = 1.87 nm) have been prepared by photochemical reduction of HAuCl<sub>4</sub> in the presence of Irgacure® 2959 under high power UV irradiation at 365 nm produced by a LED source. ...
Show more >Homogeneous, small gold nanoparticles (d = 1.87 nm) have been prepared by photochemical reduction of HAuCl<sub>4</sub> in the presence of Irgacure® 2959 under high power UV irradiation at 365 nm produced by a LED source. These particles have been deposited on PTFE microbeads (d = 200 μm) and evaluated for the catalysis of the oxidative esterification of aldehydes in the presence of H<sub>2</sub>O<sub>2</sub>. Under green light (λ ≈ 530 nm) and repeated addition of H<sub>2</sub>O<sub>2</sub>, the catalytic system is accelerated and achieves complete conversions in minutes. Furthermore the catalyst can be recycled ten times consecutively without any activity loss by adding a step for AuNP recycling. The mechanism of the reaction follows a zero rate order, and Hammett free energy relationships for substituted benzaldehydes afforded a positive ρ value (ρ = 2.35) demonstrating that the initial hemiacetalisation equilibrium (ρ = 2.31) is the rate determining step. Kinetics data are in agreement with an Eley-Rideal type mechanism and permits proposing a reaction mechanism.Show less >
Show more >Homogeneous, small gold nanoparticles (d = 1.87 nm) have been prepared by photochemical reduction of HAuCl<sub>4</sub> in the presence of Irgacure® 2959 under high power UV irradiation at 365 nm produced by a LED source. These particles have been deposited on PTFE microbeads (d = 200 μm) and evaluated for the catalysis of the oxidative esterification of aldehydes in the presence of H<sub>2</sub>O<sub>2</sub>. Under green light (λ ≈ 530 nm) and repeated addition of H<sub>2</sub>O<sub>2</sub>, the catalytic system is accelerated and achieves complete conversions in minutes. Furthermore the catalyst can be recycled ten times consecutively without any activity loss by adding a step for AuNP recycling. The mechanism of the reaction follows a zero rate order, and Hammett free energy relationships for substituted benzaldehydes afforded a positive ρ value (ρ = 2.35) demonstrating that the initial hemiacetalisation equilibrium (ρ = 2.31) is the rate determining step. Kinetics data are in agreement with an Eley-Rideal type mechanism and permits proposing a reaction mechanism.Show less >
Language :
Anglais
Popular science :
Non
Source :