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Cobalt based hybrid Fischer–Tropsch synthesis catalyst for improved selectivity of hydrocarbons in the JP-8 carbon number range from a synthesis gas obtained from the pyrolysis of the MixAlco process derived sludge

Paper ID Volume ID Publish Year Pages File Format Full-Text
40847 45868 2012 9 PDF Available
Title
Cobalt based hybrid Fischer–Tropsch synthesis catalyst for improved selectivity of hydrocarbons in the JP-8 carbon number range from a synthesis gas obtained from the pyrolysis of the MixAlco process derived sludge
Abstract

The synthesis gas produced from the pyrolysis of the MixAlco process [5] (which converts wastes into fuels and chemicals) has the composition of ∼45% H2/35% CO together with up to about 20% CH4. Recovery of the methane and application of steam reforming allows the adjustment of the H2:CO ratio to about 1.9 optimum for cobalt performance in an enhanced Fischer–Tropsch synthesis (FTS) process. The performance of a new hybrid catalyst Co-SiO2/Mo-Pd-Pt-HZSM-5 (with a metal–metal–acid functionality) was compared with that of a conventional Co-SiO2 catalyst under the same thermodynamic condition of 10 atm and 250 °C. The specific surface areas of the two catalysts were characterized using the BET technique. The electron probe microanalyzer (with WDS and EDS capabilities) was then used to confirm the presence of the applied metals Co, Mo, Pd and Pt on the respective supports. The effect of pressure was then examined on the hybrid catalyst at the temperature of 250 °C and a higher pressure of 13.6 atm. At 10 atm and 250 °C, the conventional FTS catalyst produced fuels rich in hydrocarbons within the gasoline (C4–C12) carbon number range. Hydrocarbons with carbon numbers within the JP-8 (C8–C17) and to some extent diesel range (C15–C25) were also produced. At the same condition the Co-SiO2-Mo-Pd-Pt/HZSM-5 catalyst increased the selectivity of JP-8 carbon number range hydrocarbons. When the hybrid catalyst Co-SiO2/Mo-Pd-Pt-HZSM-5 was examined at 13.6 atm and 250 °C, a further increase in the selectivity of JP-8 carbon number range hydrocarbons and to some extent diesel was observed. The relative amounts of olefins and n-paraffins decreased with the distribution shifting towards the production of more isomers. A fixed bed continuous flow catalytic system was used.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (126 K)Download as PowerPoint slideHighlights► The catalyst Co-SiO2/Mo-Pd-Pt-HZSM-5 produces fuels with increased selectivity of JP-8 at low pressures. ► At higher pressures, Co-SiO2/Mo-Pd-Pt-HZSM-5 increases further the selectivity of JP-8. ► Production of straight chain hydrocarbons rather than isomers was prevalent for same catalyst.

Keywords
MixAlco process; Pyrolysis; Sludge; Efficiency; Fischer–Tropsch synthesis; JP-8; Gasoline; Diesel; Selectivity; Co-SiO2/Mo-Pd-Pt-HZSM-5 catalyst
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Cobalt based hybrid Fischer–Tropsch synthesis catalyst for improved selectivity of hydrocarbons in the JP-8 carbon number range from a synthesis gas obtained from the pyrolysis of the MixAlco process derived sludge
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 437–438, 26 September 2012, Pages 63–71
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