Fischer–Tropsch synthesis over TiO2 supported cobalt catalyst: Effect of TiO2 crystal phase and metal ion loading

Authors: Katsuya Shimura, Tomohisa Miyazawa, Toshiaki Hanaoka, Satoshi Hirata

Abstract:
Five kinds of cobalt-loaded TiO₂ (Co/TiO₂) catalysts, which were prepared from TiO2 samples with different crystal phase and specific surface area by an impregnation method, were studied for Fischer–Tropsch (FT) synthesis with the stirred slurry phase tank reactor. Co/TiO₂ catalysts prepared from TiO₂ with more than 15% of rutile phase exhibited about four times higher CO conversion rate than those from pure anatase TiO₂ did. We further examined eleven kinds of metal ion as the additives of the TiO₂ support. Co/TiO2 catalysts loaded with alkali earth elements showed high CO conversion rate, while Mn- and V-loaded catalysts showed high C5+ selectivity and low CH4 selectivity. Among the prepared catalysts, Co/TiO₂ loaded with small amount (0.8 wt%) of Ca ions showed the highest CO conversion rate and sitetime yield of C5+ products, which were 1.7 and 1.9 times higher than those over the bare Co/TiO₂ catalyst. The activity of Co/TiO₂ catalysts proportionally increased with increasing the surface area of cobalt metal, showing that the reaction would be structure-insensitive and depend on the number of the exposed Co metal sites on the catalyst surface.

Keywords:
Fischer–Tropsch synthesis
Cobalt
Titanium oxide
Crystal phase
Metal ion loading

Published in: Applied catalysis A: General  (Volumes 460–461, Pages 1-132, 10 June 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Fischer–Tropsch synthesis over TiO2 supported cobalt catalyst: Effect of TiO2 crystal phase and metal ion loading

Bình luận của bạn

*

*

*

*

 Captcha

Gửi bình luận nhập lại