Development of stable and efficient CeVO4 ...
Type de document :
Article dans une revue scientifique
URL permanente :
Titre :
Development of stable and efficient CeVO4 systems for the selective reduction of NOx by ammonia: Structure-activity relationship
Auteur(s) :
Gillot, Sylvain [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tricot, Grégory [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Dacquin, Jean-Philippe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dujardin, Christophe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tricot, Grégory [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Vezin, Herve [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Dacquin, Jean-Philippe [Auteur]

Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dujardin, Christophe [Auteur]

Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Granger, Pascal [Auteur]

Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Titre de la revue :
Applied Catalysis B. Environmental
Numéro :
218
Pagination :
338-348
Date de publication :
2017-06-23
Discipline(s) HAL :
Chimie/Catalyse
Résumé en anglais : [en]
Bulk CeVO4 catalysts prepared by hydrothermal synthesis have been developed for the ammonia-selective catalytic reduction of NOx to nitrogen. The catalytic properties were evaluated in standard- and fast-SCR conditions for ...
Lire la suite >Bulk CeVO4 catalysts prepared by hydrothermal synthesis have been developed for the ammonia-selective catalytic reduction of NOx to nitrogen. The catalytic properties were evaluated in standard- and fast-SCR conditions for stationary and mobile applications. The coexistence of low concentration of Ce4+ species stabilized as CeO2 with bulk CeVO4 was found to be crucial for enhancing the intermediate formation of NO2 from NO oxidation. Such cooperative effects impact on the rate of NO conversion to nitrogen regardless of the operating conditions. Aging processes under wet atmosphere at 500 °C and 600 °C did not destabilize the bulk zircon-type structure of CeVO4. No loss of vanadium was observed due to significant sublimation of vanadium. Despite poorer textural properties with regard to fresh CeVO4, aged CeVO4 catalysts exhibit better catalytic properties in terms of rate of NO conversion and selectivity thus providing an alternative to less stable supported vanadia-based catalysts. Indeed, higher TOF values were measured in standard-SCR conditions at 200 °C on aged samples at 600 °C whereas an aging at 500 °C leads to selectivity enhancement at high temperature. All these changes can be rationalized based on the surface modifications of redox and acidic properties of vanadium species due to a slight extraction and stabilization of VOx species.Lire moins >
Lire la suite >Bulk CeVO4 catalysts prepared by hydrothermal synthesis have been developed for the ammonia-selective catalytic reduction of NOx to nitrogen. The catalytic properties were evaluated in standard- and fast-SCR conditions for stationary and mobile applications. The coexistence of low concentration of Ce4+ species stabilized as CeO2 with bulk CeVO4 was found to be crucial for enhancing the intermediate formation of NO2 from NO oxidation. Such cooperative effects impact on the rate of NO conversion to nitrogen regardless of the operating conditions. Aging processes under wet atmosphere at 500 °C and 600 °C did not destabilize the bulk zircon-type structure of CeVO4. No loss of vanadium was observed due to significant sublimation of vanadium. Despite poorer textural properties with regard to fresh CeVO4, aged CeVO4 catalysts exhibit better catalytic properties in terms of rate of NO conversion and selectivity thus providing an alternative to less stable supported vanadia-based catalysts. Indeed, higher TOF values were measured in standard-SCR conditions at 200 °C on aged samples at 600 °C whereas an aging at 500 °C leads to selectivity enhancement at high temperature. All these changes can be rationalized based on the surface modifications of redox and acidic properties of vanadium species due to a slight extraction and stabilization of VOx species.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
ENSCL
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Collections :
Équipe(s) de recherche :
Matériaux pour la catalyse (MATCAT)
Remédiation et matériaux catalytiques (REMCAT)
Remédiation et matériaux catalytiques (REMCAT)
Date de dépôt :
2019-09-25T14:05:50Z
2021-06-24T14:44:54Z
2021-10-08T14:20:27Z
2024-01-31T07:18:27Z
2021-06-24T14:44:54Z
2021-10-08T14:20:27Z
2024-01-31T07:18:27Z
Fichiers
- Revised manuscript APCATB-D-17-00717.docx
- Version finale acceptée pour publication (postprint)
- Accès libre
- Accéder au document