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Microwave assisted synthesis of fine chemicals in solvent-free conditions over mesoporous zirconium phosphate

Paper ID Volume ID Publish Year Pages File Format Full-Text
46863 46451 2011 10 PDF Available
Title
Microwave assisted synthesis of fine chemicals in solvent-free conditions over mesoporous zirconium phosphate
Abstract

Synthesis of various industrially important fine chemicals under microwave irradiation (MWI) in solvent-free conditions over mesoporous zirconium phosphate (m-ZrP) is reported. m-ZrP is synthesized by MWI in basic medium using a precursor solution of zirconium carbonate complex as zirconium source and CTAB as a pore-directing agent. MWI time and MWI power were found to have significant influence on the textural properties of synthesized m-ZrP. Microscopic analyses of the synthesized m-ZrP indicate the presence of worm like pores with spherical morphology. DRIFT analysis of pyridine adsorbed m-ZrP and NH3-TPD measurements indicate the presence of appreciable amount of Brönsted acid sites. Synthesized m-ZrP exhibits high catalytic activity towards Claisen–Schmidt condensation reaction in solvent-free conditions under microwave irradiation. The m-ZrP showed high activity towards other acid catalyzed reactions such as Friedel–Craft benzylation, Pechmann condensation and carbonyl group protection reaction, and also for the synthesis of benzo-xanthenes in solvent-free conditions under MWI. The catalytic activity of m-ZrP is substantially higher than that of conventional layered ZrP. The synthesized catalysts are re-usable for at least five times after regeneration, without losing their catalytic activity significantly.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Microwave assisted synthesis of mesoporous zirconium phosphate (m-ZrP). ► m-ZrP is an efficient catalyst for fine chemicals under microwave irradiation. ► 98% conversion with 99% selectivity of chalcone was obtained in 10 min. ► The developed procedure is convenient, economical and time efficient.

Keywords
Zirconium phosphate; Mesoporous; Solid acid catalyst; Microwave irradiation; Fine chemicals; Claisen–Schmidt reaction
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Microwave assisted synthesis of fine chemicals in solvent-free conditions over mesoporous zirconium phosphate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 103, Issues 3–4, 5 April 2011, Pages 378–387
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