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Effect of addition of zeolite to iron-based activated-carbon-supported catalyst for Fischer–Tropsch synthesis in separate beds and mixed beds

Paper ID Volume ID Publish Year Pages File Format Full-Text
55216 47043 2012 9 PDF Available
Title
Effect of addition of zeolite to iron-based activated-carbon-supported catalyst for Fischer–Tropsch synthesis in separate beds and mixed beds
Abstract

In-reactor upgrading of the products of Fischer–Tropsch (FT) reactions using synthesis gas was studied by adding zeolite ZSM-5 to a supported iron-based FT catalyst. The effects of ZSM-5 amounts and bed arrangements on the product distribution were investigated. Product profiles were analyzed for changing the ZSM-5 weight from 50 to 200% of the FTS amount. Oligomerization, aromatization, isomerization, and cracking reactions are enhanced with increasing ZSM-5 weight. The base catalyst showed no selectivity toward aromatic compounds, but addition of ZSM-5 formed C7–10 aromatic compounds. Long-chain hydrocarbon molecules (C13+) formed by the base catalyst are effectively cracked, and the products are isomerized on the ZSM-5 catalyst surface. Two catalyst-bed configurations were used: separate-bed and mixed-bed. Both arrangements show conversion of alcohols to hydrocarbons and water. The separate-bed arrangement gave higher conversions of CO and H2, and higher yields of liquid hydrocarbons. The relative decline in FT activity for the mixed bed is probably due to metal migration from FT catalyst to ZSM-5, as confirmed by energy-dispersive X-ray spectroscopy of the spent ZSM-5. The maximum amount of i-C5–12 plus aromatics (a measure of high-octane gasoline-range hydrocarbons) is formed in the separate bed using equal amounts of zeolite and base catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (116 K)Download as PowerPoint slideHighlights► FT products were upgraded by adding zeolite to a supported iron-based FT catalyst. ► Yields of i-C5–12 plus aromatics are maximum with a 1:1 ratio of the two components. ► Zeolite and FT catalysts in separate beds perform better than in a mixed bed. ► The decline may be due to migration of metals from FT catalyst to zeolite.

Keywords
Zeolite; Iron; Activated carbon; Fischer–Tropsch process; Synthesis gas; Fuel
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Effect of addition of zeolite to iron-based activated-carbon-supported catalyst for Fischer–Tropsch synthesis in separate beds and mixed beds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 198, Issue 1, 30 December 2012, Pages 280–288
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