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Catalytic isosafrol oxidation mediated by impregnated and encapsulated vanadyl-Y-zeolite under microwave irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
44332 46015 2007 7 PDF Available
Title
Catalytic isosafrol oxidation mediated by impregnated and encapsulated vanadyl-Y-zeolite under microwave irradiation
Abstract

Piperonal is an important intermediate in the synthesis of drugs like l-DOPA. Vanadyl-Y-zeolites have been tested as potential catalysts for this process. The use of encapsulated vanadyl compounds in Y-zeolite pores led to excellent rates of isosafrol oxidation under microwave irradiation. Native Y-zeolite better allowed the diffusion of the oxidant agent (hydrogen peroxide) through the catalyst pores compared to the VO-exchanged catalysts. This led to piperonal, which was also obtained due to the presence of V5+ supported on one of the catalysts. These factors aided the extension of the oxidation process of isosafrol. On the other hand, vanadyl-zeolites, containing V4+ species, promoted the reaction to intermediate (epoxide) with high selectivity under microwave radiation. Finally the impregnation of VO(Salen) on Y-zeolite showed better selectivity for epoxide formation than did the incorporated VO(Salen)-zeolite. Catalyst's surface area and availability of the vanadyl group were the main factors which allowed this superior performance.

Graphical abstractThe paper reports the characterization of vanadyl-Y-zeolites produced via impregnation and encapsulation methods. Their catalytic activities for isosafrol oxidation, promoted via microwave irradiation, were evaluated in contrast of well-known catalysts, as V2O5/Y-zeolite composites and non-exchanged zeolite. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Y-zeolite; Ion exchange; Isosafrol; Oxidation; Microwaves
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Catalytic isosafrol oxidation mediated by impregnated and encapsulated vanadyl-Y-zeolite under microwave irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 326, Issue 1, 30 June 2007, Pages 82–88
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