Study of the effect of gd-doping ceria on ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Study of the effect of gd-doping ceria on the performance of pt/gdceo2/al2o3 catalysts for the dry reforming of methane
Auteur(s) :
Da Fonseca, R. O. [Auteur]
Garrido, G. S. [Auteur]
Rabelo-Neto, Raimundo Crisostomo [Auteur]
Silveira, E. B. [Auteur]
Simoes, R. C. C. [Auteur]
Mattos, Lisiane Veiga [Auteur]
Bellot Noronha, Fabio [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Garrido, G. S. [Auteur]
Rabelo-Neto, Raimundo Crisostomo [Auteur]
Silveira, E. B. [Auteur]
Simoes, R. C. C. [Auteur]
Mattos, Lisiane Veiga [Auteur]
Bellot Noronha, Fabio [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Titre de la revue :
Catalysis Today
Nom court de la revue :
Catal. Today
Numéro :
355
Pagination :
737-745
Date de publication :
2020-09-15
ISSN :
0920-5861
Mot(s)-clé(s) en anglais :
Biogas
Cerium-doped gadolinium
Hydrogen production
Pt catalysts
Dry reforming
Cerium-doped gadolinium
Hydrogen production
Pt catalysts
Dry reforming
Discipline(s) HAL :
Chimie/Catalyse
Résumé en anglais : [en]
This work studied the performance of Pt/Al2O3 and Pt/CexGd1-xO2/Al2O3 catalysts for the dry reforming of methane at 1073 K. Pt/Al2O3 catalyst underwent severe deactivation at the beginning of reaction, whereas the deactivation ...
Lire la suite >This work studied the performance of Pt/Al2O3 and Pt/CexGd1-xO2/Al2O3 catalysts for the dry reforming of methane at 1073 K. Pt/Al2O3 catalyst underwent severe deactivation at the beginning of reaction, whereas the deactivation of Pt/Ce0.8Gd0.2/Al2O3 and Pt/Ce0.5Gd0.5/Al2O3 catalysts was less significant. Pt/36Ce0.8Gd0.2/Al2O3 catalyst remained quite stable during reaction. in situ XRD and XANES experiments showed the formation of oxygen vacancies and Ce3+ species during the reduction of the mixed oxide, which promoted the mechanism of carbon removal from the Pt particle. In the absence of mixed oxide, carbon deposition led to the deactivation of Pt/Al2O3 catalyst. The cyclohexane dehydrogenation reaction revealed that Pt sintering is responsible for the deactivation of Pt/Ce0.8Gd0.2/Al2O3 and Pt/Ce0.5Gd0.5/Al2O3 catalysts. The stability of Pt/36Ce0.8Gd0.2/Al2O3 catalyst is likely due to the close contact between Pt and the CeGd mixed oxide because of the higher extent of alumina coverage by the mixed oxide. This promotes the mechanism of carbon removal from the surface of Pt particles and inhibits Pt particle size growth.Lire moins >
Lire la suite >This work studied the performance of Pt/Al2O3 and Pt/CexGd1-xO2/Al2O3 catalysts for the dry reforming of methane at 1073 K. Pt/Al2O3 catalyst underwent severe deactivation at the beginning of reaction, whereas the deactivation of Pt/Ce0.8Gd0.2/Al2O3 and Pt/Ce0.5Gd0.5/Al2O3 catalysts was less significant. Pt/36Ce0.8Gd0.2/Al2O3 catalyst remained quite stable during reaction. in situ XRD and XANES experiments showed the formation of oxygen vacancies and Ce3+ species during the reduction of the mixed oxide, which promoted the mechanism of carbon removal from the Pt particle. In the absence of mixed oxide, carbon deposition led to the deactivation of Pt/Al2O3 catalyst. The cyclohexane dehydrogenation reaction revealed that Pt sintering is responsible for the deactivation of Pt/Ce0.8Gd0.2/Al2O3 and Pt/Ce0.5Gd0.5/Al2O3 catalysts. The stability of Pt/36Ce0.8Gd0.2/Al2O3 catalyst is likely due to the close contact between Pt and the CeGd mixed oxide because of the higher extent of alumina coverage by the mixed oxide. This promotes the mechanism of carbon removal from the surface of Pt particles and inhibits Pt particle size growth.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 :
Date de dépôt :
2022-03-02T07:15:06Z