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Conversion of methylesters to hydrocarbons over an H-ZSM5 zeolite catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
42460 45926 2009 7 PDF Available
Title
Conversion of methylesters to hydrocarbons over an H-ZSM5 zeolite catalyst
Abstract

The conversion of methyl octanoate on an H-ZSM5 zeolite catalyst has been investigated as a model reaction for the production of hydrocarbon fuels and chemicals from biodiesel. The reactivity of methyl octanoate on H-ZSM5 is higher than that observed with a linear alkane of the same chain length as the ester, n-octane. The enhanced activity may be due to the strong adsorption of the ester group on the zeolite sites. The deoxygenation of methyl octanoate yielded a variety of hydrocarbons (C1–C7), with significant amounts of aromatics. Octanoic acid and heavy products, particularly 8-pentadecanone, were formed as primary products from methyl octanoate via acid-catalyzed hydrolysis and condensation, respectively. Both octanoic acid and the condensation products undergo further reaction, producing aromatics. The comparison conducted with n-octane as a feed indicates that aromatics can be formed through a series of reactions, namely cracking, oligomerization, and cyclization. A small amount of ethylbenzene and o-xylene at low conversion of methyl octanoate indicates that direct dehydrocyclization may also take place, but this path was not evident when the feed was n-octane.

Graphical abstractThe conversion of methyl octanoate on H-ZSM5 yields a variety of hydrocarbons (C1–C7), with significant amounts of aromatics. Octanoic acid and heavy products, particularly 8-pentadecanone are formed as primary products via acid-catalyzed hydrolysis and condensation, respectively. Both octanoic acid and the condensation products undergo further reaction producing aromatics as secondary products.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Biofuels; Methyl ester conversion; Alkane conversion; Aromatization; H-ZSM5
First Page Preview
Conversion of methylesters to hydrocarbons over an H-ZSM5 zeolite catalyst
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 361, Issues 1–2, 20 June 2009, Pages 99–105
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis