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Coupling reactions of aromatic halides with palladium catalyst immobilized on poly(vinyl alcohol) nanofiber mats

Paper ID Volume ID Publish Year Pages File Format Full-Text
41118 45877 2012 6 PDF Available
Title
Coupling reactions of aromatic halides with palladium catalyst immobilized on poly(vinyl alcohol) nanofiber mats
Abstract

Nanoporous poly(vinyl alcohol) (PVA) nanofiber mats prepared by means of electrospinning have been used for the immobilization of palladium catalyst. Thermal treatment of the palladium-loaded PVA nanofiber mats results in the cross-linking of the matrix PVA molecules as well as the reduction of the divalent palladium (Pd2+) into zerovalent palladium (Pd0) species. The palladium oxidation states were examined by X-ray photoelectron spectroscopic (XPS) analysis. The PVA nanofiber morphology was characterized by scanning electron microscopy (SEM). The catalytic activity and recyclability of the prepared heterogeneous palladium catalysts have been evaluated for the Ullmann, Heck–Mizoroki and Sonogashira coupling reactions of aromatic halides. The large structure of the Pd/PVA nanofiber mats can greatly facilitate its separation and recycling, and the high catalytic activity and stability of the prepared Pd/PVA nanofiber mats have been attributed to the chelation of palladium species with the abundant hydroxyl functional groups on the PVA matrix surface area.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (237 K)Download as PowerPoint slideHighlights► Nanoporous poly(vinyl alcohol) (PVA) nanofiber mats were prepared by electrospinning. ► The prepared PVA nanofiber mats were used to immobilize palladium catalyst. ► The morphology of the PVA nanofiber mats was examined by SEM images. ► The palladium oxidation states were examined by XPS analysis. ► The catalytic activity and recyclability were examined for different coupling reactions.

Keywords
Poly(vinyl alcohol) (PVA) fiber mats; Heterogeneous palladium catalyst; Ullmann homocoupling; Heck–Mizoroki and Sonogashira cross-couplings
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Coupling reactions of aromatic halides with palladium catalyst immobilized on poly(vinyl alcohol) nanofiber mats
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 267–272
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