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Effect of time on stream and temperature on upgraded products from Fischer–Tropsch synthesis when zeolite is added to iron-based activated-carbon-supported catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
54664 47019 2013 8 PDF Available
Title
Effect of time on stream and temperature on upgraded products from Fischer–Tropsch synthesis when zeolite is added to iron-based activated-carbon-supported catalyst
Abstract

•Adding ZSM-5 to a Fe-based FT catalyst alters stability and effect of temperature.•FT and WGS rates are unaffected by ZSM-5, and pass through maxima at 300 °C.•Individual products show temperature effects based on competing activation energies.•ZSM-5 and FT function losses are caused by coke deposited and decrease in active iron.

In a continuation of previously reported work, the effect of temperature on products obtained when zeolite ZSM-5 is added to a supported iron-based Fischer–Tropsch (FT) catalyst was studied. Further, the stability of the combination was investigated for up to 240 h time on stream at the optimum temperature. From 280 °C to 320 °C, amounts of small-chain hydrocarbons (C1–5) increase with increase in temperature because of higher FT rates. Liquid hydrocarbon production rates increase at 300 °C due to an increase in the FT rate. A further increase in the temperature causes these rates to drop, to give small-chain hydrocarbon (C1–4) species. Aromatic yields are also found to reach a maximum at 300 °C in the separate bed. Alcohol formation for the FT catalyst increases with increase in temperatures. The lowest temperature used, 280 °C, is sufficient for the ZSM-5 to dehydrate all the alcohols formed by the FT catalyst to hydrocarbons. Further, the FT catalyst and ZSM-5 were tested for 240 h time on stream (TOS) at 300 °C. The catalyst shows FT stability up to 120 h and a slow decline in activity up to 240 h. A progressive loss of the ZSM-5 activity occurs with TOS. Deposition of coke and/or coke precursors on ZSM-5, confirmed by energy-dispersive X-ray spectroscopy, decreases the aromatic compound yield, and increases olefin selectivity with time on stream due to reduction in oligomerization reactions.

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Keywords
Zeolite; Iron; Activated carbon; Fischer–Tropsch process; Synthesis gas; Deactivation
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Effect of time on stream and temperature on upgraded products from Fischer–Tropsch synthesis when zeolite is added to iron-based activated-carbon-supported catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 214, 1 October 2013, Pages 82–89
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