Titre :

Brønsted acid sites based on penta-coordinated aluminum species

Auteur(s) :

Wang, Zichun [Auteur]
Jiang, Yijiao [Auteur]
Lafon, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Trebosc, Julien [Auteur]
Duk Kim, Kyung [Auteur]
Stampfl, Catherine [Auteur]
Baiker, Alfons [Auteur]
Amoureux, Jean-Paul [Auteur]
Huang, Jun [Auteur]

Titre de la revue :

Nature communications

Numéro :

7

Pagination :

13820

Date de publication :

2016-12-15

Discipline(s) HAL :

Chimie/Chimie inorganique

Résumé en anglais : [en]

Zeolites and amorphous silica-alumina (ASA), which both provide Brønsted acid sites (BASs), are the most extensively used solid acid catalysts in the chemical industry. It is widely believed that BASs consist only of ...
Lire la suite >Zeolites and amorphous silica-alumina (ASA), which both provide Brønsted acid sites (BASs), are the most extensively used solid acid catalysts in the chemical industry. It is widely believed that BASs consist only of tetra-coordinated aluminum sites (AlIV) with bridging OH groups in zeolites or nearby silanols on ASA surfaces. Here we report the direct observation in ASA of a new type of BAS based on penta-coordinated aluminum species (AlV) by 27Al-{1H} dipolar-mediated correlation two-dimensional NMR experiments at high magnetic field under magic-angle spinning. Both BAS-AlIV and -AlV show a similar acidity to protonate probe molecular ammonia. The quantitative evaluation of 1H and 27Al sites demonstrates that BAS-AlV co-exists with BAS-AlIV rather than replaces it, which opens new avenues for strongly enhancing the acidity of these popular solid acids.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

ENSCL
CNRS
Centrale Lille
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 :

2019-09-25T14:06:16Z