Titre :

Acidity enhancement through synergy of penta- and tetra-coordinated aluminum species in amorphous silica networks

Auteur(s) :

Wang, Zichun [Auteur]
The University of Sydney
Li, Tong [Auteur]
Ruhr University Bochum = Ruhr-Universität Bochum [RUB]
Jiang, Yijiao [Auteur]
Macquarie University [Sydney]
Lafon, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Liu, Zongwen [Auteur]
The University of Sydney
Trebosc, Julien [Auteur]
Centrale Lille
Baiker, Alfons [Auteur]
Institute for Chemical and Bioengineering [ETH Zürich] [ICB]
Amoureux, Jean-Paul [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Huang, Jun [Auteur]
The University of Sydney
Trebosc, Julien [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Titre de la revue :

Nature Communications

Nom court de la revue :

Nat Commun

Numéro :

11

Pagination :

225

Date de publication :

2020-01-13

ISSN :

2041-1723

Discipline(s) HAL :

Chimie/Catalyse

Résumé en anglais : [en]

Amorphous silica-aluminas (ASAs) are widely used in acid-catalyzed C-H activation reactions and biomass conversions in large scale, which can be promoted by increasing the strength of surface Brønsted acid sites (BAS). ...
Lire la suite >Amorphous silica-aluminas (ASAs) are widely used in acid-catalyzed C-H activation reactions and biomass conversions in large scale, which can be promoted by increasing the strength of surface Brønsted acid sites (BAS). Here, we demonstrate the first observation on a synergistic effect caused by two neighboring Al centers interacting with the same silanol group in flame-made ASAs with high Al content. The two close Al centers decrease the electron density on the silanol oxygen and thereby enhance its acidity, which is comparable to that of dealuminated zeolites, while ASAs with small or moderate Al contents provide mainly moderate acidity, much lower than that of zeolites. The ASAs with enhanced acidity exhibit outstanding performances in C-H bond activation of benzene and glucose dehydration to 5-hydroxymethylfurfural, simultaneously with an excellent calcination stability and resistance to leaching, and they offer an interesting potential for a wide range of acid and multifunctional catalysis.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Équipe(s) de recherche :

RMN et matériaux inorganiques (RM2I)

Date de dépôt :

2022-03-02T07:13:11Z
2023-11-20T13:47:58Z