High resolution NMR unraveling Cu substitution ...
Document type :
Article dans une revue scientifique
Permalink :
Title :
High resolution NMR unraveling Cu substitution of Mg in hydrotalcites–ethanol reactivity
Author(s) :
Hosoglu, Fadime [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Faye, Jérémy [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mareseanu, Klaudia [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tesquet, Guillaume [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Miquel, Pierre [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Capron, Mickael [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Gardoll, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Lamonier, Jean-Francois [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Lamonier, Carole [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Dumeignil, Franck [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Faye, Jérémy [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mareseanu, Klaudia [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tesquet, Guillaume [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Miquel, Pierre [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Capron, Mickael [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Gardoll, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Lamonier, Jean-Francois [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Lamonier, Carole [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Dumeignil, Franck [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Journal title :
Applied Catalysis A. General
Volume number :
504
Pages :
533-541
Publication date :
2015-09-05
English keyword(s) :
Hydrotalcite
Sonication
Copper
Acetaldehyde
Ethanol
Sonication
Copper
Acetaldehyde
Ethanol
HAL domain(s) :
Chimie/Catalyse
English abstract : [en]
Hydrotalcite-type Mg6−xCuxAl2(OH)16CO3·4H2O solids (with x = 0, 1, 3, 5) were synthesized as precursors of mixed oxides obtained by subsequent calcination. Two families of samples (synthesized by coprecipitation with and ...
Show more >Hydrotalcite-type Mg6−xCuxAl2(OH)16CO3·4H2O solids (with x = 0, 1, 3, 5) were synthesized as precursors of mixed oxides obtained by subsequent calcination. Two families of samples (synthesized by coprecipitation with and without sonication) were thoroughly characterized by XRD, TG–TDA, H2-TPR, NMR, SEM and N2-physisorption. Their reactivity towards ethanol was further assessed. Sonication enabled considerably reducing the preparation duration. MgO and Al2O3 were formed upon calcination of the hydrotalcites under air at 400 °C, while copper-enriched phases (e.g. CuO, spinel like structure…) were formed from the solids with higher Cu contents. Magnesium atoms substitution by copper atoms in the hydrotalcite structure was evidenced for the first time in this kind of materials using high-resolution solid state NMR. Indeed, a very unusual but remarkable “Fermi contact effect” was responsible for specific features observed on the NMR spectra. Further, partial substitution of magnesium by copper led to an increase in specific surface area, with the formation of particles of a smaller size. Copper addition considerably enhanced the dehydrogenation properties of the solids at low temperature (∼250 °C), with a higher reactivity towards ethanol, and higher selectivities to acetaldehyde.Show less >
Show more >Hydrotalcite-type Mg6−xCuxAl2(OH)16CO3·4H2O solids (with x = 0, 1, 3, 5) were synthesized as precursors of mixed oxides obtained by subsequent calcination. Two families of samples (synthesized by coprecipitation with and without sonication) were thoroughly characterized by XRD, TG–TDA, H2-TPR, NMR, SEM and N2-physisorption. Their reactivity towards ethanol was further assessed. Sonication enabled considerably reducing the preparation duration. MgO and Al2O3 were formed upon calcination of the hydrotalcites under air at 400 °C, while copper-enriched phases (e.g. CuO, spinel like structure…) were formed from the solids with higher Cu contents. Magnesium atoms substitution by copper atoms in the hydrotalcite structure was evidenced for the first time in this kind of materials using high-resolution solid state NMR. Indeed, a very unusual but remarkable “Fermi contact effect” was responsible for specific features observed on the NMR spectra. Further, partial substitution of magnesium by copper led to an increase in specific surface area, with the formation of particles of a smaller size. Copper addition considerably enhanced the dehydrogenation properties of the solids at low temperature (∼250 °C), with a higher reactivity towards ethanol, and higher selectivities to acetaldehyde.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
ENSCL
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Collections :
Research team(s) :
Catalyse pour l’énergie (CATEN)
Remédiation et matériaux catalytiques (REMCAT)
Valorisation des alcanes et de la biomasse (VAALBIO)
Remédiation et matériaux catalytiques (REMCAT)
Valorisation des alcanes et de la biomasse (VAALBIO)
Submission date :
2019-09-24T14:34:47Z
2020-09-25T07:09:10Z
2020-09-25T07:09:10Z
Files
- Guerbet_HTCu.pdf
- Version éditeur
- Restricted access
- Access the document