Isomerization of n-hexane over silica-supported heteropoly acids promoted by the reduced Ce-Ni oxides.
J Colloid Interface Sci
; 248(1): 123-9, 2002 Apr 01.
Article
en En
| MEDLINE
| ID: mdl-16290512
ABSTRACT
The structure and catalytic properties of silica-supported heteropoly acids promoted by the reduced Ce-Ni oxides are first studied by using chemical analysis XRD, FT-Raman, XPS, EPR, TG, surface area measurements, and microreactor test. It is found that silica-supported heteropoly acids have isomerization activity, but are very easy to deactivate by coke deposition. With the promotion of the reduced Ce-Ni oxides, however, the better activity and the higher selectivity to isomers could be obtained, suggesting that the reduced Ce-Ni oxides really have hydrogenating/dehydrogenating functions. Moreover, it is found that the presence of the reduced Ce-Ni oxides is not only beneficial for eliminating the coke deposition, but also effective for maintaining the structure of silica-supported heteropoly acids during reaction. The effect of the composition of the mechanical mixtures of silica-supported heteropoly acids and the Ce-Ni oxides on the catalytic properties has been explored.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Ácidos
/
Cerio
/
Dióxido de Silicio
/
Hexanos
/
Níquel
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
J Colloid Interface Sci
Año:
2002
Tipo del documento:
Article
País de afiliación:
Francia