Title :

Robust Ruthenium Catalysts Supported on Mesoporous Cyclodextrin-Templated TiO2-SiO2 Mixed Oxides for the Hydrogenation of Levulinic Acid to γ-Valerolactone

Author(s) :

Decarpigny, Cédric [Auteur]
Noel, Sebastien [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Addad, Ahmed [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Ponchel, Anne [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Monflier, Eric [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Bleta, Rudina [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Journal title :

International journal of molecular sciences

Volume number :

22

Pages :

1721

Publisher :

MDPI

Publication date :

2021-02-09

ISSN :

1661-6596

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

In this paper, we present a versatile template-directed colloidal self-assembly method for the fabrication in aqueous phase of composition-tuned mesoporous RuO<sub>2<\/sub>@TiO<sub>2<\/sub>-SiO<sub>2<\/sub> catalysts. ...
Show more >In this paper, we present a versatile template-directed colloidal self-assembly method for the fabrication in aqueous phase of composition-tuned mesoporous RuO<sub>2<\/sub>@TiO<sub>2<\/sub>-SiO<sub>2<\/sub> catalysts. Randomly methylated &beta;-cyclodextrin\/Pluronic F127 supramolecular assemblies were used as soft templates, TiO<sub>2<\/sub> colloids as building blocks, and tetraethyl orthosilicate as a silica source. Catalysts were characterized at different stages of their synthesis using dynamic light scattering, N<sub>2<\/sub>-adsorption analysis, powder X-ray diffraction, temperature programmed reduction, high-resolution transmission electron microscopy, high-angle annular bright-field and dark-field scanning transmission electron microscopy, together with EDS elemental mapping. Results revealed that both the supramolecular template and the silica loading had a strong impact on the pore characteristics and crystalline structure of the mixed oxides, as well as on the morphology of the RuO<sub>2<\/sub> nanocrystals. Their catalytic performance was then evaluated in the aqueous phase hydrogenation of levulinic acid (LA) to &gamma;-valerolactone (GVL) under mild conditions (50 °C, 50 bar H<sub>2<\/sub>). Results showed that the cyclodextrin-derived catalyst displayed almost quantitative LA conversion and 99% GVL yield in less than one hour. Moreover, this catalyst could be reused at least five times without loss of activity. This work offers an effective approach to the utilization of cyclodextrins for engineering the surface morphology of Ru nanocrystals and pore characteristics of TiO<sub>2<\/sub>-based materials for catalytic applications in hydrogenation reactions.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
INRA
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Catalyse et chimie supramoléculaire (CASU)

Submission date :

2022-03-08T13:48:50Z
2022-10-12T05:55:52Z