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Transesterification of cyclic carbonates with methanol at ambient conditions over tungstate-based solid catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44601 46044 2006 7 PDF Available
Title
Transesterification of cyclic carbonates with methanol at ambient conditions over tungstate-based solid catalysts
Abstract

Dimethyl carbonate synthesis with 80 mol% yield is achieved through transesterification of ethylene carbonate with methanol at ambient conditions (RT and atmospheric pressure) using alkali and alkaline-earth tungstates as solid catalysts. The catalysts are efficient even at the sub-ambient temperatures. Reactions under CO2 pressure indicate that CO2 atmosphere retards the transesterification reaction completely below 100 °C. Experimental conditions of 150 °C and 3.4 MPa CO2 pressure are required to obtain maximum DMC yield of 71 mol%. Synthesis of DMC by one-pot synthesis using epoxide, CO2 and methanol is not as effective as that by two-step method with the present catalyst system. Raman and IR spectra of methanol-interacting tungstates indicate the formation of a methoxide ion species adsorbed at the catalyst surface as one possible reaction intermediates.

Keywords
Dimethyl carbonate; Sodium tungstate; Ethylene carbonate; Transesterification; Heterogeneous catalyst; Raman spectroscopy
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Transesterification of cyclic carbonates with methanol at ambient conditions over tungstate-based solid catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 312, 8 September 2006, Pages 108–114
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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