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Design of active centers for bisphenol-A synthesis by organic–inorganic dual modification of heteropolyacid

Paper ID Volume ID Publish Year Pages File Format Full-Text
41852 45902 2010 7 PDF Available
Title
Design of active centers for bisphenol-A synthesis by organic–inorganic dual modification of heteropolyacid
Abstract

An effective design of solid acid catalysts for synthesis of bisphenol-A was investigated using organic–inorganic dual modification of heteropolyacids. Among various solid acids, partially Cs-ion exchanged tungstophosphate (Cs2.5H0.5PW12O40) showed the highest turnover frequency, i.e., the initial reaction rate per acid site. The acid strengths estimated by differential heat of ammonia adsorption showed that relatively moderate acid strength is optimum for the intrinsic activity of acid sites. Cs2.5H0.5PW12O40 was further modified by immobilization of mercapto compounds. The addition of 2-diethylamino-ethanethiol (DEAT) to Cs2.5H0.5PW12O40 significantly enhanced both activity and selectivity. When the ratio of DEAT and protonic acid site was unity, the designed catalyst showed comparable bisphenol-A yield and higher turnover number and frequency than those of a conventional ion-exchange resin. The high catalytic activity of the dual modified heteropolyacid is attributed to the microscopically designed active center composed of inorganic protonic acid coupled with immobilized organic thiol group.

Graphical abstractThe organic–inorganic dual modified heteropolyacid produced by Cs-ion change and immobilization of amino-mercapto compound shows comparable bisphenol-A yield to that of a conventional ion-exchange resin and higher turnover number and frequency.Figure optionsDownload full-size imageDownload high-quality image (36 K)Download as PowerPoint slide

Keywords
Heteropolyacid; Bisphenol-A; Cs-ion exchange; 2-Diethylamino-ethanethiol
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Design of active centers for bisphenol-A synthesis by organic–inorganic dual modification of heteropolyacid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 380, Issues 1–2, 31 May 2010, Pages 33–39
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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