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Effects of the reduction temperature over ex-chloride Ru Fischer–Tropsch catalysts supported on high surface area graphite and promoted by potassium

Paper ID Volume ID Publish Year Pages File Format Full-Text
39636 45829 2014 7 PDF Available
Title
Effects of the reduction temperature over ex-chloride Ru Fischer–Tropsch catalysts supported on high surface area graphite and promoted by potassium
Abstract

•Chloride traces neutralize the K promotion in HSAG supported Ru catalysts.•Reduction in H2 at 773 K is needed to completely remove chloride anions.•The CO adsorption heats are higher on K promoted Ru catalysts.•K promotion provides lower CH4 selectivity and higher olefin/paraffin ratio in FT.

For ex-choride Ru catalysts supported on high surface area graphite and promoted by potassium oxide, the influence of the reduction temperature on the surface properties and on the catalytic performance in the Fischer–Tropsch reaction (1 bar, H2/CO = 2/1) is investigated. The Ru metallic particle size generated on these catalysts was studied by CO chemisorption and checked by TEM. Characterization of the catalysts by XPS analysis and microcalorimetry of CO adsorption reveals the presence of residual chloride anions after reduction (hydrogen flow) at 573 and even 673 K. The chloride traces neutralize the effects of the potassium promoter in the Fischer–Tropsch reaction. When catalysts are reduced at 773 K, lower methane selectivity and higher olefin/paraffin ratio are observed for those with potassium added. Our results show the significance of the reduction treatment and the presence of residual chloride anions to achieve a ruthenium based Fischer–Tropsch catalyst with improved selectivity to light olefins.

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Keywords
Fischer–Tropsch reaction; Ex-chloride Ru catalyst; High surface area graphite; Potassium promoter; CO adsorption microcalorimetry
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Effects of the reduction temperature over ex-chloride Ru Fischer–Tropsch catalysts supported on high surface area graphite and promoted by potassium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 480, 20 June 2014, Pages 86–92
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
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