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Int. J. Mol. Sci. 2010, 11(7), 2770-2779; doi:10.3390/ijms11072770
Article

Reactivity of Heteropolytungstate and Heteropolymolybdate Metal Transition Salts in the Synthesis of Dimethyl Carbonate from Methanol and CO2

1,* , 2, 1 and 1
Received: 24 May 2010 / Revised: 24 June 2010 / Accepted: 12 July 2010 / Published: 23 July 2010
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Abstract

A series of Keggin-type heteropoly compounds (HPC) having different countercations (Co, Fe) and different addenda atoms (W, Mo) were synthesized and characterized by means of Fourier-Transform Infrared Spectrometer (FT-IR) and X-ray powder diffraction (XRD). The catalytic properties of the prepared catalysts for the dimethyl carbonate (DMC) synthesis from CO2 and CH3OH were investigated. The experimental results showed that the catalytic activity is significantly influenced by the type of the countercation and addenda atoms transition metal. Among the catalysts examined, Co1.5PW12O40 is the most active for the DMC synthesis, owing to the synergetic effect between Co and W. Investigating the effect of the support showed that the least acidic one (Al2O3) enhanced the conversion but decreased the DMC selectivity in favor of that of methyl formate (MF), while that of dimethoxy methane remained stable.
Keywords: heteropoly compounds; dimethyl carbonate; Keggin structure; carbon dioxide heteropoly compounds; dimethyl carbonate; Keggin structure; carbon dioxide
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Aouissi, A.; Al-Deyab, S.S.; Al-Owais, A.; Al-Amro, A. Reactivity of Heteropolytungstate and Heteropolymolybdate Metal Transition Salts in the Synthesis of Dimethyl Carbonate from Methanol and CO2. Int. J. Mol. Sci. 2010, 11, 2770-2779.

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