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

Meenakshisundaram, Sankar, Nair, C. Madhaven, Murty, K. and Manikandan, P. 2006. Transesterification of cyclic carbonates with methanol at ambient conditions over tungstate-based solid catalysts. Applied Catalysis A: General 312 , pp. 108-114. 10.1016/j.apcata.2006.06.034

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Publisher: Elsevier
ISSN: 0926-860X
Last Modified: 04 Jun 2017 06:33
URI: http://orca.cf.ac.uk/id/eprint/61947

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