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Influence of formic acid and water on the [Pd(OAc)2(dppp)] catalyzed ethene–carbon monoxide copolymerization carried out in aprotic organic solvents

Paper ID Volume ID Publish Year Pages File Format Full-Text
40763 45864 2012 5 PDF Available
Title
Influence of formic acid and water on the [Pd(OAc)2(dppp)] catalyzed ethene–carbon monoxide copolymerization carried out in aprotic organic solvents
Abstract

The copolymerization of ethene with carbon monoxide catalyzed by [Pd(OAc)2(dppp)] in an aprotic solvent such as 1,4-dioxane or nitromethane is efficiently promoted both by H2O and HCOOH and yields a perfectly alternating polyketone (PK). The influence of the concentration of the promoters, pressure and temperature on the catalyst productivity and the limiting viscosity number (LVN) has been studied. The productivity increases with the increase of temperature and pressure. The LVN increases upon increasing the pressure and lowering the temperature. At 363 K and 9.0 MPa, in HCOOH/H2O/1-4,dioxane (2.7/1.35/1 molar ratio), the productivity is 37.50 kgPK (gPd h)−1 (LVN 2.77 dL g−1).LVN lowers upon increasing the concentration of the acid, suggesting that it is involved in the protonolysis chain-transfer process.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (119 K)Download as PowerPoint slideHighlight► [Pd(OAc)2(dppp)] as catalyst for the ethene–CO copolymerization. ► Best results in 1,4-dioxane-H2O-HCOOH as reaction medium. ► Productivity and molecular weight higher than in methanol. ► Productivity increases by increasing pressure and temperature. ► Molecular weight increases by increasing pressure.

Keywords
Palladium catalyst; Carbon monoxide; Ethene; Solvent effect; Polyketone
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Influence of formic acid and water on the [Pd(OAc)2(dppp)] catalyzed ethene–carbon monoxide copolymerization carried out in aprotic organic solvents
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 449, 27 December 2012, Pages 198–202
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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