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Effects of phosphorus and saccharide on size, shape, and reducibility of Fischer–Tropsch catalysts for slurry phase and fixed-bed reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
40416 45852 2013 12 PDF Available
Title
Effects of phosphorus and saccharide on size, shape, and reducibility of Fischer–Tropsch catalysts for slurry phase and fixed-bed reactions
Abstract

Saccharide was incorporated into Co/Al2O3 by impregnating sucrose and a cobalt precursor on a phosphorus-treated γ-Al2O3 support (P-Al2O3), to control the catalyst size, shape, and reducibility. The effects of P-Al2O3 on the relationship between C5+ productivity, dispersion, and reducibility were investigated and compared with our previous work based on the high surface area γ-Al2O3. Powder X-ray diffraction results for Co/P-Al2O3 revealed that the addition of P increased the average size of the cobalt oxide crystals due to weakened interactions between the metal and the support, which led to the increased reducibility while compromising the dispersion. The extraordinarily enhanced hydrothermal stability of the catalysts was corroborated with the help of FT-IR analysis. Activity tests were conducted in a fixed-bed reactor as well as in a slurry phase reactor charged with Co/P-Al2O3 catalysts to investigate the reactor behavior. The addition of a saccharide, such as sucrose, efficiently increased the dispersion capability and regulated crystal shape to overcome the lowered dispersion caused by phosphorus treatment. The effect of sucrose on crystal size and shape of Co/P-Al2O3 was verified through TEM imaging and XRD analysis. The control of crystal size and shape was found to be crucial to attain maximum productivity, in addition to dispersion and reducibility.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (145 K)Download as PowerPoint slideHighlights► Saccharide and phosphorus were incorporated into cobalt catalyst to control size, shape as well as reducibility. ► The extraordinarily enhanced hydrothermal stability as well as reducibility of P-treated catalyst was corroborated. ► Activity tests were conducted in a fixed-bed reactor as well as in a slurry phase reactor.

Keywords
Cobalt; Dispersion; Fischer–Tropsch; Hydrogenation; Reduction
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Effects of phosphorus and saccharide on size, shape, and reducibility of Fischer–Tropsch catalysts for slurry phase and fixed-bed reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 453, 26 February 2013, Pages 358–369
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