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

Paper ID Volume ID Publish Year Pages File Format Full-Text
40211 45846 2013 7 PDF Available
Title
Fischer–Tropsch synthesis over TiO2 supported cobalt catalyst: Effect of TiO2 crystal phase and metal ion loading
Abstract

•Co/TiO2 prepared from rutile TiO2 is more active than that from anatase TiO2.•Low loading of Ca ions on TiO2 enhances the activity of Co/TiO2 catalyst.•The use of rutile TiO2 and the loading of Ca ions greatly enhanced the Co surface area.

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 site-time 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.

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Keywords
Fischer–Tropsch synthesis; Cobalt; Titanium oxide; Crystal phase; Metal ion loading
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 460–461, 10 June 2013, Pages 8–14
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us