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Acidity and porosity modulation of MWW type zeolites for Nopol production by Prins condensation

Paper ID Volume ID Publish Year Pages File Format Full-Text
52202 46866 2011 5 PDF Available
Title
Acidity and porosity modulation of MWW type zeolites for Nopol production by Prins condensation
Abstract

Prins condensation of β-pinene with paraformaldehyde was carried out over MCM-22, delaminated ITQ-2 and silica pillared MCM-36. The mesopore-containing MCM-36 and ITQ-2 catalysts exhibit higher conversion of β-pinene due to more exposed acid sites. Lewis acid sites are responsible for Prins condensation while Brønsted acid sites favor the isomerization of pinene. The Brønsted acid sites can be removed mostly by ion-exchanging the zeolites with sodium cations. Thus, NaMWW zeolites had a higher selectivity towards Nopol. Of these, NaITQ-2 showed the highest activity and selectivity, and is a stable and reusable catalyst for production of Nopol.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► The accessibility of acid sites is essential in the condensation reaction. ► Lewis acid sites are responsible for condensation while Brønsted acid sites favor isomerization. ► Brønsted acid sites on zeolites can be removed by ion-exchanging with sodium cations. ► NaITQ-2 is a good catalyst to produce Nopol by Prins condensation.

Keywords
Prins condensation; Nopol; MWW zeolites; Exposed acid sites; Lewis acid sites
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Acidity and porosity modulation of MWW type zeolites for Nopol production by Prins condensation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 12, 1 July 2011, Pages 1131–1135
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