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Hydrocracking of n-hexadecane on noble metal/silica–alumina catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
54656 47019 2013 7 PDF Available
Title
Hydrocracking of n-hexadecane on noble metal/silica–alumina catalysts
Abstract

Bifunctional catalysts consisting of platinum or palladium on amorphous silica–alumina were prepared and tested in the hydrocracking of n-hexadecane (n-C16H34). Product selectivities toward mono-branched and multi-branched feed isomers and cracking products have been determined in a wide range of conversions, varying liquid hourly space velocity at constant operating parameters (pressure = 30 bar; temperature = 310 °C; H2/n-C16H34 feed molar ratio = 10).A simple kinetic study is presented, in which the reactions are approximated by a network of pseudo first order irreversible reaction steps. The reaction network model was fitted to the experimental data, and kinetic constants for the different reaction steps were obtained. It could be concluded that mono-branched feed isomers are primary products in the hydrocracking/hydroisomerization reaction network; multi-branched isomers are formed mainly from mono-branched as a secondary product. On the platinum catalyst cracking products were formed as primary products, and it proved to be slightly more active than the palladium based one, at the same metallic molar loading. It could be shown that the platinum catalyst yields cracking products both via a bifunctional metal/acid mechanism and by monofunctional (metal only) hydrogenolysis. This second mechanism accounted for the higher activity of the platinum catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (161 K)Download as PowerPoint slideHighlights► Platinum and palladium on silica–alumina were compared at the same metal molar loading on the hydrocracking of n-hexadecane. ► The platinum catalyst shows a slightly higher activity than the palladium one. ► Palladium behaves as a nearly ideal hydrocracking catalyst. ► Platinum shows a monofunctional hydrogenolysis mechanism to yield cracking products. ► This mechanism accounts for the higher activity measured on the platinum based catalyst.

Keywords
Hydrocracking; Hexadecane; Fischer–Tropsch; Bifunctional catalyst; Platinum; Palladium
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Hydrocracking of n-hexadecane on noble metal/silica–alumina catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 214, 1 October 2013, Pages 12–18
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