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Improving carbon retention in biomass conversion by alkylation of phenolics with small oxygenates

Paper ID Volume ID Publish Year Pages File Format Full-Text
40614 45860 2012 8 PDF Available
Title
Improving carbon retention in biomass conversion by alkylation of phenolics with small oxygenates
Abstract

Alkylation of phenolics with alcohols is an efficient way to retain carbon from small oxygenates in the liquid products of pyrolysis bio-oil. In this contribution, we have investigated the alkylation of m-cresol with several alkylating agents over H-Beta zeolite. The alkylation activity follows the sequence 2-propanol > propylene > 1-propanol. In all cases, propylene is the actual alkylation agent since the alcohols dehydrate at a faster rate than the rate of alkylation. A two-stage process is proposed to convert fractions of bio-oil rich in small aldehydes and ketones together with phenolics. In the first stage, aldehydes and ketones are selectively hydrogenated to alcohols. In the second stage, the resulting alcohols alkylate the phenolic compounds and get incorporated into the upgraded liquid. To illustrate this concept, two consecutive catalyst beds have been used. The first bed contains a metal catalyst for the selective hydrogenation. Among several catalysts investigated, Cu/SiO2 and Pt–Fe/SiO2 were found to exhibit good selectivity to hydrogenate the aldehyde and ketone, respectively, while preserving the aromatic ring of the phenolic compound. The second bed contains an H-Beta zeolite for the alkylation stage.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (142 K)Download as PowerPoint slideHighlights► Alkylation is an efficient method to retain C from small oxygenates in liquid fraction of bio-oil. ► m-Cresol alkylation activity follows the sequence 2-propanol > propylene > 1-propanol. ► A hydrogenation/alkylation two-stage process is proposed to utilize small aldehydes and ketones. ► The combination Pt–Fe/SiO2 + H-beta was found to be effective for the two-stage process.

Keywords
Biofuels; Cresol alkylation; Acetone and propanal hydrogenation
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Improving carbon retention in biomass conversion by alkylation of phenolics with small oxygenates
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 447–448, 7 December 2012, Pages 14–21
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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