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Fischer–Tropsch synthesis: Attempt to tune FTS and WGS by alkali promoting of iron catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41889 45903 2010 9 PDF Available
Title
Fischer–Tropsch synthesis: Attempt to tune FTS and WGS by alkali promoting of iron catalysts
Abstract

The effect of water on the performance of alkali-promoted, precipitated Fe catalysts was investigated during Fischer–Tropsch (FT) synthesis in a continuously stirred tank reactor. In these studies, the added water (5–25 mol%) replaced an equivalent amount of inert gas so that all other reaction conditions remained the same before, during and after water addition. The externally added water had a positive effect on the CO conversion for all the alkali-promoted, precipitated iron catalysts. The impact of the added water is to increase the rate of the water-gas shift (WGS) reaction with up to 10–15 mol% added water, and then leveling off for further increases in the amount of water added to the feed gas. Increasing the water amount in the feed gas caused the fraction of CO converted into hydrocarbons to decrease and both the WGS activity and the oxygenate selectivity to increase. Common for all the alkali promoted iron catalysts was a decrease in C5+ selectivity and an increase in the methane selectivity with increasing amounts of water up to 10–15 mol%; with further increases of water, the C5+ selectivity increases and methane selectivity decreases. Methane selectivity is directly correlated to the CO conversion and H2/CO ratio inside the reactor.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (30 K)Download as PowerPoint slideResearch highlights▶ Effect of water on FT synthesis. ▶ Comparison of alkali promoters on iron catalysts. ▶ Methane selectivity increase with increase in water v.p. ▶ Hydrocarbon selectivity decreases with increase in water v.p.

Keywords
Fischer–Tropsch synthesis; Iron catalysts; Alkali; Water effect; Lithium; Potassium; Rubidium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 389, Issues 1–2, 1 December 2010, Pages 131–139
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