Role of supports in cobalt-based catalysts for Fischer-Tropsch synthesis of heavy hydrocarbons

Citation
Jl. Zhang et al., Role of supports in cobalt-based catalysts for Fischer-Tropsch synthesis of heavy hydrocarbons, CHIN J CATA, 22(3), 2001, pp. 275-278
Citations number
13
Language
CHINESE
art.tipo
Article
Categorie Soggetti
Chemical Engineering
Journal title
CHINESE JOURNAL OF CATALYSIS
ISSN journal
0253-9837 → ACNP
Volume
22
Issue
3
Year of publication
2001
Pages
275 - 278
Database
ISI
SICI code
0253-9837(200105)22:3<275:ROSICC>2.0.ZU;2-2
Abstract
The cobalt-based catalysts for F-T synthesis of heavy hydrocarbons were tes ted in a down-flow fixed-bed reactor and characterized by using BET, TPR, H -2-TPD, NH3-TPD, XRD, and XPS. The results indicated that the activity and selectivity of the catalysts were influenced by the type and the surface pr operties of the supports and the reaction conditions. There were different product distributions over the catalysts with different supports. The heavy hydrocarbons over Co/ZrO2, were amassed between C-10 and C-25. The C5+ pro ducts over Co/SiO2 collected in C(9)similar toC(18). However, the heavy hyd rocarbons over Co/Al2O3 centered in C(6)similar toC(13). It was found that the acidity affected the active phase dispersion from the NH3-TPD and XRD r esults. The TPR profiles showed that there was the interaction between coba lt and,support and the Co/Al2O3 catalyst had the lowest reduction degree. T he support effect on the catalytic reaction had a direct influence on the p roduct distribution and chain growing probability. It was evident that the supports also affected the surface concentration of active components. Howe ver, the surface concentration of cobalt oxides did not increase with the r ise of the support surface area and had no linear relationship with the cat alytic activity.