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Crucial factors for catalyst aggregation and deactivation on Co/Al2O3 in a slurry-phase Fischer–Tropsch synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
41123 45877 2012 12 PDF Available
Title
Crucial factors for catalyst aggregation and deactivation on Co/Al2O3 in a slurry-phase Fischer–Tropsch synthesis
Abstract

The different behaviors for catalyst deactivation by forming aggregated catalyst lumps were investigated on the phosphorous-modified Co/P–Al2O3 and the unmodified Co/Al2O3 Fischer–Tropsch synthesis (FTS) catalysts in a slurry-phase continuous stirred tank reactor. The lower catalytic activity at steady-state with a fast deactivation rate was observed on the phosphorous-unmodified Co/Al2O3 catalyst due to the facile formation of aggregated catalyst lump with a high hydrophilic property of support and a significant hydrocarbon deposition on catalyst surface. The amount of adsorbed water and the deposited hydrocarbons are strongly related with aggregated catalyst lump formation. The adsorbed water could possibly transform the local γ-Al2O3 surface to pseudo-boehmite (Bronsted acidic Al2OH sites) material which is characterized as a low attrition resistance and accelerates the formation of fine powders during FTS reaction. The formed fine powder during FTS reaction could be easily aggregated and it is resulted in catalyst deactivation due to the difficult intraparticular diffusion of reactants. The possible mechanisms of phase transformation of γ-Al2O3 to pseudo-boehmite and formation of aggregated catalyst lump were suggested by measuring the deposited hydrocarbons and the concentration of adsorbed water on catalyst surface with the help of the characterizations such as X-ray photoelectron spectroscopy, temperature-programmed surface reaction, diffuse reflectance infrared Fourier transform and water-sorption method.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (129 K)Download as PowerPoint slideHighlights► The catalyst deactivation by forming the aggregated FTS catalyst lumps were investigated in a slurry-phase reaction. ► It is related with the amount of adsorbed water and the deposited hydrocarbons. ► The phase transformation of γ-Al2O3 to pseudo-boehmite accelerates the aggregation.

Keywords
Fischer–Tropsch synthesis; Deactivation; Aggregation; Hydrophilicity; Cobalt; Phosphorous-modification; Alumina
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Crucial factors for catalyst aggregation and deactivation on Co/Al2O3 in a slurry-phase Fischer–Tropsch synthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 310–321
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