fulltext.study @t Gmail

Tuning double metal cyanide catalysts with complexing agents for the selective production of cyclic carbonates over polycarbonates

Paper ID Volume ID Publish Year Pages File Format Full-Text
41041 45875 2012 7 PDF Available
Title
Tuning double metal cyanide catalysts with complexing agents for the selective production of cyclic carbonates over polycarbonates
Abstract

A double metal cyanide (DMC) complex based on (Zn3[Co(CN)6]2), an effective catalyst for the ring opening polymerization of epoxides and the copolymerization of carbon dioxide with epoxides, was successfully utilized for the solvent-free cycloaddition of CO2 to styrene oxide (SO) by the introduction of cetyltrimethylammonium bromide (CTAB) as a complexing agent (CA). Several DMC catalysts were prepared by introducing co-complexing agents (co-CAs) along with the CA. From the XRD data, it was clear that all the catalysts were amorphous with no peak corresponding to the precursor ZnCl2. XPS analysis was performed to explain the successful introduction of the CA to the DMC catalyst, in which the binding energy of the zinc atom shifted from precursor ZnCl2 to DMC. Elemental analysis and FT-IR also confirmed the incorporation of the CA with Zn3[Co(CN)6]2. The DMC complex was proven to be an effective catalyst for the solvent-free synthesis of styrene carbonate by the cycloaddition of styrene oxide and CO2. This paper reports the tunability of the metal cyanide catalysts with CA for the selective preparation of cyclic carbonates over polycarbonates. 1H NMR and FT-IR confirmed product formation. The effects of reaction parameters like catalyst amount, temperature, CO2 pressure, and reaction time were also investigated.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (59 K)Download as PowerPoint slideHighlights► Double metal cyanide (DMC) complexes based on (Zn3[Co(CN)6]2) were successfully synthesized. ► Cetyltrimethylammonium bromide (CTAB), tert-butanol and/or PEG–PPG–PEG were used as complexing agents. ► The DMC catalysts were very efficient for the selective production of styrene carbonate over polycarbonate. ► No additional solvent was used for the cycloaddition of carbon dioxide and styrene oxide.

Keywords
Double metal cyanide; Carbon dioxide; Styrene oxide; Styrene carbonate
First Page Preview
Tuning double metal cyanide catalysts with complexing agents for the selective production of cyclic carbonates over polycarbonates
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 419–420, 29 March 2012, Pages 178–184
Authors
, , , , , ,
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