Mg-promotion of Ni natural clay-supported catalysts for dry reforming of methane - Sorbonne Université
Article Dans Une Revue RSC Advances Année : 2018

Mg-promotion of Ni natural clay-supported catalysts for dry reforming of methane

H. Liu
P. da Costa
H. Bel Hadj Taief
  • Fonction : Auteur
M. Benzina
  • Fonction : Auteur

Résumé

Mg-promotion of natural clay based Ni-catalysts was considered, as a way of boosting the dry reforming of methane (DRM) activity of these materials. The results of the DRM experiments performed at temperatures from 600 C to 850 C evidenced much higher methane and CO 2 conversions for the Mg-promoted catalysts. Mg-promotion led of course to a significant increase of CO 2-adsorption ability (basicity). However, the increased catalytic activity of the Mg-promoted materials was rather linked to increased Ni-dispersion and Ni 0 crystallite size. Indeed, independent of the physico-chemical properties of the support, the presence of Mg led to the formation of a MgNiO 2 mixed phase that, upon reduction, resulted in the formation of metallic Ni clusters having sizes around 7–9 nm, considerably smaller than in any of the non-promoted catalysts. Carbon formation was found to take place to a greater extent in the presence of the Mg-promoted catalysts, due to C–H bond activation leading also to favored direct methane decomposition (DMD). In spite of this, the activity of the Mg-promoted catalysts was well maintained over 5 hour DRM experiments performed at 750 C.

Domaines

Chimie
Fichier principal
Vignette du fichier
c8ra02615g.pdf (1.79 Mo) Télécharger le fichier
Origine Publication financée par une institution
Loading...

Dates et versions

hal-01840314 , version 1 (16-07-2018)

Licence

Identifiants

Citer

H. Liu, P. da Costa, H. Bel Hadj Taief, M. Benzina, M.E. Gálvez. Mg-promotion of Ni natural clay-supported catalysts for dry reforming of methane. RSC Advances, 2018, 8 (35), pp.19627 - 19634. ⟨10.1039/c8ra02615g⟩. ⟨hal-01840314⟩
46 Consultations
82 Téléchargements

Altmetric

Partager

More