Second youth of a metal-free dehydrogenation ...
Type de document :
Article dans une revue scientifique: Article original
DOI :
URL permanente :
Titre :
Second youth of a metal-free dehydrogenation catalyst: when gamma-al2o3 meets coke under oxygen- and steam-free conditions
Auteur(s) :
Ba, Housseinou [Auteur]
Institut de chimie et procédés pour l'énergie, l'environnement et la santé [ICPEES]
Tuci, Giulia [Auteur]
Istituto di Chimica dei Composti Organometallici [ICCOM]
Evangelisti, Claudio [Auteur]
Istituto di Scienze e Tecnologie Molecolari = Institute of Molecular Science and Technologies [ISTM-CNR [Perugia - Milano]]
Ceppatelli, Matteo [Auteur]
European Laboratory for Non-Linear Spectroscopy [LENS]
Istituto di Chimica dei Composti Organometallici [ICCOM]
Nguyen-Dinh, Lam [Auteur]
The university of Danang
Dal Santo, Vladimiro [Auteur]
Istituto di Scienze e Tecnologie Molecolari = Institute of Molecular Science and Technologies [ISTM-CNR [Perugia - Milano]]
Bossola, Filippo [Auteur]
Istituto di Scienze e Tecnologie Molecolari = Institute of Molecular Science and Technologies [ISTM-CNR [Perugia - Milano]]
Nhut, Jean-Mario [Auteur]
Institut de chimie et procédés pour l'énergie, l'environnement et la santé [ICPEES]
Rossin, Andrea [Auteur]
Istituto di Chimica dei Composti Organometallici [ICCOM]
Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Giambastiani, Giuliano [Auteur]
Istituto di Chimica dei Composti Organometallici [ICCOM]
Institut de chimie et procédés pour l'énergie, l'environnement et la santé [ICPEES]
Cuong, Pham-Huu [Auteur]
Institut de chimie et procédés pour l'énergie, l'environnement et la santé [ICPEES]
Institut de chimie et procédés pour l'énergie, l'environnement et la santé [ICPEES]
Tuci, Giulia [Auteur]
Istituto di Chimica dei Composti Organometallici [ICCOM]
Evangelisti, Claudio [Auteur]
Istituto di Scienze e Tecnologie Molecolari = Institute of Molecular Science and Technologies [ISTM-CNR [Perugia - Milano]]
Ceppatelli, Matteo [Auteur]
European Laboratory for Non-Linear Spectroscopy [LENS]
Istituto di Chimica dei Composti Organometallici [ICCOM]
Nguyen-Dinh, Lam [Auteur]
The university of Danang
Dal Santo, Vladimiro [Auteur]
Istituto di Scienze e Tecnologie Molecolari = Institute of Molecular Science and Technologies [ISTM-CNR [Perugia - Milano]]
Bossola, Filippo [Auteur]
Istituto di Scienze e Tecnologie Molecolari = Institute of Molecular Science and Technologies [ISTM-CNR [Perugia - Milano]]
Nhut, Jean-Mario [Auteur]
Institut de chimie et procédés pour l'énergie, l'environnement et la santé [ICPEES]
Rossin, Andrea [Auteur]
Istituto di Chimica dei Composti Organometallici [ICCOM]
Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Giambastiani, Giuliano [Auteur]
Istituto di Chimica dei Composti Organometallici [ICCOM]
Institut de chimie et procédés pour l'énergie, l'environnement et la santé [ICPEES]
Cuong, Pham-Huu [Auteur]
Institut de chimie et procédés pour l'énergie, l'environnement et la santé [ICPEES]
Titre de la revue :
ACS Catalysis
Nom court de la revue :
ACS Catal.
Numéro :
9
Pagination :
9474-9484
Date de publication :
2019-09-06
ISSN :
2155-5435
Mot(s)-clé(s) en anglais :
catalytically active coke
gamma-Al2O3@coke composites
metal-free catalysis
heterogeneous catalysis
ethylbenzene direct dehydrogenation
gamma-Al2O3@coke composites
metal-free catalysis
heterogeneous catalysis
ethylbenzene direct dehydrogenation
Discipline(s) HAL :
Chimie/Catalyse
Résumé en anglais : [en]
The role of carbonaceous deposits (coke) formed in dehydrogenation catalysis has been extensively investigated over the last few decades mainly with respect to the deactivation of metal-based and metal-free heterogeneous ...
Lire la suite >The role of carbonaceous deposits (coke) formed in dehydrogenation catalysis has been extensively investigated over the last few decades mainly with respect to the deactivation of metal-based and metal-free heterogeneous catalysts. Although much less emphasized, coke deposits grown on selected metal oxides have also been described as active and selective phases for alkene dehydrogenation under an oxidative or non-oxidative atmosphere. This work describes the straightforward preparation of “coked” γ-Al2O3 composites and their catalytic performance in the ethylbenzene (EB) direct dehydrogenation (DDH) to styrene (ST) under steam- and oxygen-free conditions. The study unveils the effective potentiality of a catalytic system already known to the scientific community but never employed for EB DDH under severe conditions, close to those commonly used in industrial plants (600 °C, 10 vol % EB/He, GHSV = 3000 h–1). Such a simple catalytic system has revealed a significant stability on long-term trials (≥150 h) and markedly high ST selectivity (≥97%) along with process rates (λ up to 16.3 mmolST gcat–1 h–1) that are the highest claimed so far for related carbon systems at work in the process. Furthermore, the outlined performance of our composites in DDH is close to that claimed for classical iron-based industrial catalysts operating in the presence of a large amount of steam. γ-Al2O3 precoking with an aliphatic C-source has shown additional beneficial effects on the ultimate γ-Al2O3@C performance in DDH. These findings pave the way for the development of cheap and durable dehydrogenation catalysts. They rewrite (in part at least) the role of coke in a challenging heterogeneous process while offering important hints to the comprehension of the reaction mechanism promoted by plain C-sites.Lire moins >
Lire la suite >The role of carbonaceous deposits (coke) formed in dehydrogenation catalysis has been extensively investigated over the last few decades mainly with respect to the deactivation of metal-based and metal-free heterogeneous catalysts. Although much less emphasized, coke deposits grown on selected metal oxides have also been described as active and selective phases for alkene dehydrogenation under an oxidative or non-oxidative atmosphere. This work describes the straightforward preparation of “coked” γ-Al2O3 composites and their catalytic performance in the ethylbenzene (EB) direct dehydrogenation (DDH) to styrene (ST) under steam- and oxygen-free conditions. The study unveils the effective potentiality of a catalytic system already known to the scientific community but never employed for EB DDH under severe conditions, close to those commonly used in industrial plants (600 °C, 10 vol % EB/He, GHSV = 3000 h–1). Such a simple catalytic system has revealed a significant stability on long-term trials (≥150 h) and markedly high ST selectivity (≥97%) along with process rates (λ up to 16.3 mmolST gcat–1 h–1) that are the highest claimed so far for related carbon systems at work in the process. Furthermore, the outlined performance of our composites in DDH is close to that claimed for classical iron-based industrial catalysts operating in the presence of a large amount of steam. γ-Al2O3 precoking with an aliphatic C-source has shown additional beneficial effects on the ultimate γ-Al2O3@C performance in DDH. These findings pave the way for the development of cheap and durable dehydrogenation catalysts. They rewrite (in part at least) the role of coke in a challenging heterogeneous process while offering important hints to the comprehension of the reaction mechanism promoted by plain C-sites.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Collections :
Équipe(s) de recherche :
Remédiation et matériaux catalytiques (REMCAT)
Date de dépôt :
2022-03-02T07:14:06Z
2024-02-05T10:52:33Z
2024-02-05T10:52:33Z