Title :

Brønsted acid sites based on penta-coordinated aluminum species

Author(s) :

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

Journal title :

Nature communications

Volume number :

7

Pages :

13820

Publication date :

2016-12-15

HAL domain(s) :

Chimie/Chimie inorganique

English abstract : [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 ...
Show more >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.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille

Collections :

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

Research team(s) :

RMN et matériaux inorganiques (RM2I)

Submission date :

2019-09-25T14:06:16Z