Gas-Phase Synthesis of Dimethyl Carbonate from Methanol and Carbon Dioxide Over Co1.5PW12O40 Keggin-Type Heteropolyanion

• Published in: International journal of molecular sciences Vol. 11; no. 4; pp. 1343 - 1351
• Main Authors: Aouissi, Ahmed, Al-Othman, Zeid Abdullah, Al-Amro, Amro
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-04-2010; Molecular Diversity Preservation International (MDPI)
• Subjects: Carbon dioxide; dimethyl carbonate; direct synthesis; heteropolyanion; Keggin structure; methanol; Temperature; Toxicity
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms11041343

The reactivity of Co1.5PW12O40 in the direct synthesis of dimethyl carbonate (DMC) from CO2 and CH3OH was investigated. The synthesized catalyst has been characterized by means of FTIR, XRD, TG, and DTA and tested in gas phase under atmospheric pressure. The effects of the reaction temperature, time on stream, and methanol weight hourly space velocity (MWHSV) on the conversion and DMC selectivity were investigated. The highest conversion (7.6%) and highest DMC selectivity (86.5%) were obtained at the lowest temperature used (200 °C). Increasing the space velocity MWHSV increased the selectivity of DMC, but decreased the conversion. A gain of 18.4% of DMC selectivity was obtained when the MWHSV was increased from 0.65 h-1 to 3.2 h-1.