Ethanol reactivity over La1+x FeO3+δ perovskites

Tesquet, Guillaume; Faye, Jérémy; Hosoglu, Fadime; Mamede, Anne-Sophie; Dumeignil, Franck; Capron, Mickael

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1016/j.apcata.2015.12.005

Permalink :

http://hdl.handle.net/20.500.12210/12382

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 (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Capron, Mickael [Auteur]

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

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 >

Language :

Anglais

Peer reviewed article :

Oui

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) :

Matériaux pour la catalyse (MATCAT)
Valorisation des alcanes et de la biomasse (VAALBIO)

Submission date :

2019-09-24T14:35:00Z
2020-09-14T17:24:02Z

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2	20.500.12210/12382*	2020-09-14T17:19:23Z
1	20.500.12210/12382.1	2019-09-24T14:35:00Z

Ethanol reactivity over La1+x FeO3+δ perovskites

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Ethanol reactivity over La1+x FeO3+δ perovskites

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