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Synthesis of hybrid SBA-15 functionalized with molybdophosphoric acid as efficient catalyst for glycerol esterification to fuel additives

Paper ID Volume ID Publish Year Pages File Format Full-Text
40883 45869 2012 10 PDF Available
Title
Synthesis of hybrid SBA-15 functionalized with molybdophosphoric acid as efficient catalyst for glycerol esterification to fuel additives
Abstract

Fibrous mesoporous hybrid silica (SBAH-15) with mesopore diameter of 70 Å was synthesized using pluronic P123 (EO20PO70EO20) as surfactant, with Brij S100 as nonionic co-surfactant. Series of catalysts with different molybdophosphoric acid (MPA) loading (5–25%) were synthesized by the thermal decomposition of MPA species in the lattice of SBAH-15. Catalysts calcined at 560 °C undergone a thermal decomposition of MPA resulted in the formation of β-MoO3 active species. The effectiveness of the hybrid support was evaluated by comparison with analogous catalyst prepared by incorporating MPA into the framework of classical SBA-15. The catalytic performance of the prepared acid catalysts was examined during glycerol esterification with acetic acid. Mono-, di- and triacetyl glycerol (MAG, DAG and TAG, respectively) were the esterification reaction products. SBAH-15(15) catalyst, with 15 wt.% MPA loading, exhibited an excellent activity during this reaction, indicated by the complete glycerol conversion (after 1 h) with a corresponding combined selectivity of 86% toward both DAG and TAG. The best reaction conditions are: reaction temperature of 110 °C, glycerol to acetic acid molar ratio of 1:6 and reaction time of 3 h. The SBAH-15(15) catalyst demonstrated good stability in activity upon recycling for four times.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (159 K)Download as PowerPoint slideHighlights► Hybrid silicate material was synthesized using Brij S100 as a co-surfactant. ► SBAH-15 functionalized with β-MoO3 employed to catalyze glycerol esterification. ► Complete glycerol conversion was achieved within 1 h of reaction time. ► The stability of the catalytic activity was examined and proved. ► Catalyst surface acidity plays a prominent role in promoting the catalytic activity.

Keywords
Glycerol; Esterification; SBA-15; Molybdophosphoric acid; MoO3
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Synthesis of hybrid SBA-15 functionalized with molybdophosphoric acid as efficient catalyst for glycerol esterification to fuel additives
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 433–434, 8 August 2012, Pages 152–161
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