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Esterification of biomass pyrolysis model acids over sulfonic acid-functionalized mesoporous silicas

Paper ID Volume ID Publish Year Pages File Format Full-Text
42527 45929 2009 8 PDF Available
Title
Esterification of biomass pyrolysis model acids over sulfonic acid-functionalized mesoporous silicas
Abstract

Esterification of acetic acid with methanol, which was used as a model reaction in the stabilization of bio-oil, was tested over propylsulfonic acid-functionalized SBA-15 materials. Due to the significant amount of water content in bio-oil, the water tolerance properties of the materials were also investigated in detail. The results showed that the functionalized mesoporous materials demonstrated a comparable site activity to H2SO4 in acetic acid esterification proving its potential for application. The effect of propylsulfonic acid loading showed that the intrinsic per site activity increased with the number of acid sites, which suggested the presence of acidic site cooperativity. Water tolerance experiments showed that SO3H-SBA-15 exhibited less reaction inhibition due to water than did H2SO4, which was at least partially ascribed to the hydrophobic propyl groups bonded to sulfonic acid groups. Further functionalization of SO3H-SBA-15 with hydrophobic propyl groups further increased the water tolerance property of the catalyst in the esterification reaction. The reusability of the catalyst was also investigated and showed multiple cycle stability for acetic acid esterification without significant loss of activity.

Graphical abstractEnhanced condensed phase acetic acid esterification catalytic activity through improved water tolerance capacity of propyl-SO3H-SBA-15 relative to H2SO4 was ascribed to the tethering propyl groups and could be further enhanced by modifying surface hydrophobicity.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Acid-functionalized mesoporous silica; Organic–inorganic acidic catalyst; Bio-oil; Acetic acid esterification; Acidic sites cooperativity; Hydrophobic modification; Water effect
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Esterification of biomass pyrolysis model acids over sulfonic acid-functionalized mesoporous silicas
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 359, Issues 1–2, 15 May 2009, Pages 113–120
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