Ethanol reactivity over La1+x FeO3+δ perovskites
Document type :
Article dans une revue scientifique: Article original
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Title :
Ethanol reactivity over La1+x FeO3+δ perovskites
Author(s) :
Tesquet, Guillaume [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Faye, Jérémy [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Hosoglu, Fadime [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mamede, Anne-Sophie [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dumeignil, Franck [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Capron, Mickael [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]
Hosoglu, Fadime [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mamede, Anne-Sophie [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dumeignil, Franck [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Capron, Mickael [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 :
511
Pages :
141-148
Publication date :
2016
HAL domain(s) :
Chimie/Catalyse
English abstract : [en]
Mixed oxide catalysts composed of mixtures of La1+xFeO3+δ perovskite and La2O3 were prepared using the auto-combustion method with glycine as an ignition promoter. A series of samples was prepared with x = 0, 0.1, 0.3, ...
Show more >Mixed oxide catalysts composed of mixtures of La1+xFeO3+δ perovskite and La2O3 were prepared using the auto-combustion method with glycine as an ignition promoter. A series of samples was prepared with x = 0, 0.1, 0.3, 0.5, 0.8 and 1, which were hereafter called La1+xFe. The as-prepared powders were characterized by XRD, XPS, DTA-TGA and N2-physisorption. Their acid-base properties were evaluated from their 2-propanol reactivity. Surface enrichment in La2O3 was detected when the lanthanum content increased. For high lanthanum concentrations, lanthanum hydroxide was also formed. The highest ethanol conversion was observed over La1.3Fe (32% at 400 °C), which contained the largest amount of basic sites. The main reaction products were ethylene, acetone, 2-pentanone and 1-butanol. Other minor products originating from dehydration, reverse aldolization and hydrogenation reactions were also detected. Such a diversity of products was due to the presence of different kinds and distribution of sites on the catalysts surface (acid, base, hydrogenation, etc.). The catalysts activity was depending on their acid-base properties: an increase in the basic character due to the La2O3 presence at the surface leaded to higher selectivities to 1-butanol and 2-pentanone, which were 6 and 31% at 400 °C, respectively, over the sample with the highest number of basic sites, which were also stronger (La1.3Fe). On the other hand, over La1.8Fe, which contained the highest quantity of La(OH)3, lower selectivities to 1-butanol and 2-pentanone (4.3 and 22%, respectively) were observed due to a decrease in the number of basic sites, together with a high ethylene selectivity (37%), with thus a predominant action of acid sites.Show less >
Show more >Mixed oxide catalysts composed of mixtures of La1+xFeO3+δ perovskite and La2O3 were prepared using the auto-combustion method with glycine as an ignition promoter. A series of samples was prepared with x = 0, 0.1, 0.3, 0.5, 0.8 and 1, which were hereafter called La1+xFe. The as-prepared powders were characterized by XRD, XPS, DTA-TGA and N2-physisorption. Their acid-base properties were evaluated from their 2-propanol reactivity. Surface enrichment in La2O3 was detected when the lanthanum content increased. For high lanthanum concentrations, lanthanum hydroxide was also formed. The highest ethanol conversion was observed over La1.3Fe (32% at 400 °C), which contained the largest amount of basic sites. The main reaction products were ethylene, acetone, 2-pentanone and 1-butanol. Other minor products originating from dehydration, reverse aldolization and hydrogenation reactions were also detected. Such a diversity of products was due to the presence of different kinds and distribution of sites on the catalysts surface (acid, base, hydrogenation, etc.). The catalysts activity was depending on their acid-base properties: an increase in the basic character due to the La2O3 presence at the surface leaded to higher selectivities to 1-butanol and 2-pentanone, which were 6 and 31% at 400 °C, respectively, over the sample with the highest number of basic sites, which were also stronger (La1.3Fe). On the other hand, over La1.8Fe, which contained the highest quantity of La(OH)3, lower selectivities to 1-butanol and 2-pentanone (4.3 and 22%, respectively) were observed due to a decrease in the number of basic sites, together with a high ethylene selectivity (37%), with thus a predominant action of acid sites.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
Collections :
Research team(s) :
Matériaux pour la catalyse (MATCAT)
Valorisation des alcanes et de la biomasse (VAALBIO)
Valorisation des alcanes et de la biomasse (VAALBIO)
Submission date :
2019-09-24T14:35:00Z
2020-09-14T17:24:02Z
2020-09-14T17:24:02Z
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