Dry Reforming of Methane on a Highly-Active Ni-CeO2 Catalyst: Effects of Metal-Support Interactions on C-H Bond Breaking.
Angew Chem Int Ed Engl
; 55(26): 7455-9, 2016 06 20.
Article
em En
| MEDLINE
| ID: mdl-27144344
ABSTRACT
Ni-CeO2 is a highly efficient, stable and non-expensive catalyst for methane dry reforming at relative low temperatures (700â
K). The active phase of the catalyst consists of small nanoparticles of nickel dispersed on partially reduced ceria. Experiments of ambient pressure XPS indicate that methane dissociates on Ni/CeO2 at temperatures as low as 300â
K, generating CHx and COx species on the surface of the catalyst. Strong metal-support interactions activate Ni for the dissociation of methane. The results of density-functional calculations show a drop in the effective barrier for methane activation from 0.9â
eV on Ni(111) to only 0.15â
eV on Ni/CeO2-x (111). At 700â
K, under methane dry reforming conditions, no signals for adsorbed CHx or C species are detected in the Câ
1s XPS region. The reforming of methane proceeds in a clean and efficient way.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Estados Unidos