title: Anchoring and promotion effects of metal oxides on silica supported catalytic gold nanoparticles.
abstract: The understanding of the interactions between the different components of supported metal doped gold catalysts is of crucial importance for selecting and designing efficient gold catalysts for reactions such as CO oxidation. To progress in this direction, a unique supported nano gold catalyst Au/SS was prepared, and three doped samples (Au/SS@M) were elaborated. The samples before and after test were characterized by Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). It is found that the doping metal species prefer to be located on the surface of gold nanoparticles and that a small amount of additional reductive metal leads to more efficient reaction. During the catalytic test, the nano-structure of the metal species transforms depending on its chemical nature. This study allows one to identify and address the contribution of each metal on the CO reaction in regard to oxidative species of gold, silica and dopants. Metal doping leads to different exposure of interface sites between Au and metal oxide, which is one of the key factors for the change of the catalytic activity. The metal oxides help the activation of oxygen by two actions: mobility inside the metal bulk and transfer of water species onto of gold nanoparticles.
authors: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR 7515 CNRS - ECPM, Université de Strasbourg 25, rue Becquerel, 67087 Strasbourg, France; Department of Chemical Engineering, Sichuan University, Chengdu 610065, China.
authors: Jingjie
authors: J
authors: Luo
authors: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS - Université de Strasbourg 23, rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France.
authors: Ovidiu
authors: O
authors: Ersen
authors: Department of Chemical Engineering, Sichuan University, Chengdu 610065, China.
authors: Wei
authors: W
authors: Chu
authors: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR 7515 CNRS - ECPM, Université de Strasbourg 25, rue Becquerel, 67087 Strasbourg, France.
authors: Thierry
authors: T
authors: Dintzer
authors: Institut Charles Sadron, CNRS, 23 rue du Loess, BP 84047, F-67034 Strasbourg Cedex 2, France.
authors: Pierre
authors: P
authors: Petit
authors: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR 7515 CNRS - ECPM, Université de Strasbourg 25, rue Becquerel, 67087 Strasbourg, France. Electronic address: corinne.petit@unistra.fr.
authors: Corinne
authors: C
authors: Petit
keywords: CO oxidation; Colloidal Au nanoparticles; Gold catalysis; Metal copper doping; Stöber silica spheres