Title :

Engineering the Distinct Structure Interface of Subnano-alumina Domains on Silica for Acidic Amorphous Silica–Alumina toward Biorefining

Author(s) :

Wang, Zichun [Auteur]
Buechel, Robert [Auteur]
Jiang, Yijiao [Auteur]
Wang, Lizhuo [Auteur]
Xu, Haimei [Auteur]
Castignolles, Patrice [Auteur]
Gaborieau, Marianne [Auteur]
Lafon, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Institut universitaire de France [IUF]
Amoureux, Jean-Paul [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Bruker BioSpin MRI GmbH [Ettlingen, Germany]
Hunger, Michael [Auteur]
Baiker, Alfons [Auteur]
Huang, Jun [Auteur]

Journal title :

JACS Au

Volume number :

1

Pages :

262-271

Publisher :

ACS Publications

Publication date :

2021-03-22

ISSN :

2691-3704

English keyword(s) :

Amorphous silica−alumina
Brønsted and Lewis acidities
double-flame-spray pyrolysis
glucose conversion
cyclohexanol dehydration
solid-state NMR

HAL domain(s) :

Chimie/Chimie inorganique
Chimie/Matériaux
Chimie/Catalyse

English abstract : [en]

Amorphous silica–aluminas (ASAs) are important solid catalysts and supports for many industrially essential and sustainable processes, such as hydrocarbon transformation and biorefining. However, the wide distribution of ...
Show more >Amorphous silica–aluminas (ASAs) are important solid catalysts and supports for many industrially essential and sustainable processes, such as hydrocarbon transformation and biorefining. However, the wide distribution of acid strength on ASAs often results in undesired side reactions, lowering the product selectivity. Here we developed a strategy for the synthesis of a unique class of ASAs with unvarying strength of Brønsted acid sites (BAS) and Lewis acid sites (LAS) using double-flame-spray pyrolysis. Structural characterization using high-resolution transmission electron microscopy (TEM) and solid-state nuclear magnetic resonance (NMR) spectroscopy showed that the uniform acidity is due to a distinct nanostructure, characterized by a uniform interface of silica–alumina and homogeneously dispersed alumina domains. The BAS population density of as-prepared ASAs is up to 6 times higher than that obtained by classical methods. The BAS/LAS ratio, as well as the population densities of BAS and LAS of these ASAs, could be tuned in a broad range. In cyclohexanol dehydration, the uniform Brønsted acid strength provides a high selectivity to cyclohexene and a nearly linear correlation between acid site densities and cyclohexanol conversion. Moreover, the concerted action of these BAS and LAS leads to an excellent bifunctional Brønsted–Lewis acid catalyst for glucose dehydration, affording a superior 5-hydroxymethylfurfural yield.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
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 :

2022-03-24T09:03:06Z
2023-05-04T17:02:40Z