Palladium-promoted cobalt catalysts supported on silica prepared by impregnation and reverse micelle for Fischer–Tropsch synthesis

Authors: Nattawut Osakoo, Robert Henkel, Sirinuch Loiha, Frank Roessner, Jatuporn Wittayakun

Abstract:
The objectives of this work were to compare physicochemical properties of silica-supported cobalt catalysts (with 10 wt% Co) prepared by impregnation (10Co-IP) and precipitation using a reverse micelle technique (10Co-RM) and to investigate influence of palladium as a promoter (0.2 wt% and 1.0 wt%) on properties of 10Co-IP and 10Co-RM. The catalysts were characterized byXRD, H₂-TPR, DR-UV–vis,XANES, EXAFS and the reactivity during Fischer–Tropsch synthesis (FTS) was tested at 230^◦C, 5 bar with H₂/CO = 2. The particle size of Co₃O₄ in 10Co-IP was larger than that of 10Co-RM which could contribute to lower selectivity to methane and C₂–C₄ paraffin products. The addition of 0.2 wt% Pd to 10Co-IP and 10Co-RM enhanced the cobalt reducibility, FTS activity and paraffin selectivity. On the other hand, the addition of 1.0 wt% Pd resulted in increased methane formation and lower CO conversion. The most suitable catalyst from this work was 0.2Pd-10Co-IP that gave high CO conversion (34.8%) and high mole fraction of paraffins (0.38) in the gasoline range (C₅–C₉).

Keywords:
Fischer–Tropsch synthesis
Cobalt
Palladium
Silica
Impregnation
Reverse micelle

Published in: Applied catalysis A: General  (Volumes 464–465, Pages 1-384, 15 August 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Palladium-promoted cobalt catalysts supported on silica prepared by impregnation and reverse micelle for Fischer–Tropsch synthesis

Bình luận của bạn

*

*

*

*

 Captcha

Gửi bình luận nhập lại