Acidity and porosity modulation of MWW type zeolites for Nopol production by Prins condensation
Wang, J. Jaenicke, S. Chuah, G.K. Hua, W. Yue, Y. Gao, Z.
Wang, J.
Hua, W.
Yue, Y.
Gao, Z.
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Alternative Title
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. © 2011 Elsevier B.V. All rights reserved.
Keywords
Exposed acid sites, Lewis acid sites, MWW zeolites, Nopol, Prins condensation
Source Title
Catalysis Communications
Publisher
Series/Report No.
Collections
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Date
2011-07-01
DOI
10.1016/j.catcom.2011.03.034
Type
Article