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

doi:10.3390/ijms11072770

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

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

Ahmed Aouissi^1,* , Salem S. Al-Deyab², Ahmad Al-Owais¹ and Amro Al-Amro¹

¹ Department of Chemistry, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia ² Petrochemical Research Chair, Department of Chemistry, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia

* Author to whom correspondence should be addressed.

Received: 24 May 2010; in revised form: 24 June 2010 / Accepted: 12 July 2010 / Published: 23 July 2010

(This article belongs to the Section Physical Chemistry, Theoretical and Computational Chemistry)

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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, Co_1.5PW₁₂O₄₀ 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

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MDPI and ACS Style

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.

AMA Style

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. International Journal of Molecular Sciences. 2010; 11(7):2770-2779.

Chicago/Turabian Style

Aouissi, Ahmed; Al-Deyab, Salem S.; Al-Owais, Ahmad; Al-Amro, Amro. 2010. "Reactivity of Heteropolytungstate and Heteropolymolybdate Metal Transition Salts in the Synthesis of Dimethyl Carbonate from Methanol and CO₂." Int. J. Mol. Sci. 11, no. 7: 2770-2779.

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