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Pathways of light compounds formation during propane and isobutane dehydrogenation on Al-Cr catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42077 45910 2010 9 PDF Available
Title
Pathways of light compounds formation during propane and isobutane dehydrogenation on Al-Cr catalysts
Abstract

Reaction pathways of the light hydrocarbons formation during propane and isobutane dehydrogenation on Al-Cr catalyst have been studied. It was determined that the majority of light compounds are formed not directly from initial paraffin, but from the main product of the paraffin dehydrogenation; olefin. The sequence of the light compounds formation reactions includes: (1) dehydrogenation of the initial paraffin with formation of targeted olefin; (2) consecutive hydrocracking of the newly produced main olefin with formation of the one carbon shorter chain olefin and methane; (3) one carbon shorter chain olefin can be converted by two parallel reactions further. The first reaction is hydrogenation of the one carbon shorter chain olefin to the formation of the one carbon shorter chain paraffin. Another parallel reaction is hydrocracking of the one carbon shorter olefin to the two carbon shorter olefin and methane. If short olefin is ethylene the final product of the hydrocracking reaction is methane. This sequence can be presented by using isobutane dehydrogenation as an example which also includes steps of light compounds formation from C3 hydrocarbons:equation(1)C4H10 → C4H8 + H2equation(2)C4H8 + H2 → C3H6 + CH4equation(3a)C3H6 + H2 → C3H8equation(3b)C3H6 + H2 → C2H4 + CH4equation(4a)C2H4 + H2 → C2H6equation(4b)C2H4 + 2H2 → 2CH4Obtained reaction pathways of light compounds formation can be applied to optimize the concept of the dehydrogenation process and explain puzzling phenomena regarding the temperature profile in the fixed bed dehydrogenation process.

Graphical abstractThis present study revealed that the majority of light compounds produced during propane and isobutane dehydrogenation on Al-Cr catalyst is formed via consecutive dehydrogenation hydrocracking of the newly produced main olefin with formation of the “one carbon shorter chain olefin” and methane. The “one carbon shorter chain olefin” can be further hydrogenated to the “one carbon shorter chain paraffin”; otherwise it can be further transformed into “two carbons shorter chain olefin” and methane by additional consecutive reaction of hydrocracking. This sequence of the pathway is presented using isobutane dehydrogenation as an example which also includes steps of the light compounds formation from C3 hydrocarbons.Figure optionsDownload full-size imageDownload high-quality image (28 K)Download as PowerPoint slide

Keywords
Light compounds; Al-Cr catalyst; Dehydrogenation; Thermo-cracking; Hydrocracking; Propane; Isobutane
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Pathways of light compounds formation during propane and isobutane dehydrogenation on Al-Cr catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 382, Issue 2, 15 July 2010, Pages 139–147
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
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us