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Acid-catalyzed etherification of bio-glycerol and isobutylene over sulfonic mesostructured silicas

Paper ID Volume ID Publish Year Pages File Format Full-Text
42982 45950 2008 8 PDF Available
Title
Acid-catalyzed etherification of bio-glycerol and isobutylene over sulfonic mesostructured silicas
Abstract

Sulfonic-acid-functionalized mesostructured silicas have demonstrated an excellent catalytic behavior in the etherification of glycerol with isobutylene to yield tert-butylated derivates. Di-tert-butylglycerols (DTBG) and tri-tert-butylglycerol (TTBG) have shown to be valuable fuel additives leading to decreases in the emission of particulate matter, hydrocarbons, carbon monoxide and unregulated aldehydes. Likewise, said ethers can also act as cold flow improvers for use in biodiesel, reducing also its viscosity. The activities and selectivities achieved over sulfonic acid-functionalized mesostructured silicas are comparable or even superior to those displayed by widely used macroporous commercial acid resins. Under optimized reaction conditions, these mesostructured catalysts yield a complete glycerol conversion with a combined selectivity towards DTBG and TTBG up to ca. 90%. Furthermore, no formation of undesirable isobutylene oligomers is observed. The acid strength of the sulfonic acid sites has also been found to be an important factor affecting the catalytic performance of these materials.

Graphical abstractSulfonic acid-modified mesostructured silicas have demonstrated an excellent catalytic performance in the etherification of glycerol with isobutylene. Their activity and selectivity towards valuable products for fuel bio-additives (di-tert-butylglycerols and tri-tert-butylglycerol) have shown to be comparable or even superior to those of macroporous commercial sulfonic acid resins. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Sulfonic; Isobutylene; Glycerol; Tertiary butyl ethers; Mesoporous; Fuel additives
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Acid-catalyzed etherification of bio-glycerol and isobutylene over sulfonic mesostructured silicas
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 346, Issues 1–2, 31 August 2008, Pages 44–51
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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