Abstract
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.
Highlights
Dimethyl carbonate (DMC) has drawn much attention in recent years as an environmentally friendly versatile intermediate
In each of the four ranges of 2θ, 7o–10o, 16o–23o, 25o–30o, and 31o–38o, the compound shows a characteristic for well defined Keggin structure of heteropolyanions [20,21,22]
The presence of the primary Keggin structure in the synthesized phases was confirmed by FTIR and XRD
Summary
Dimethyl carbonate (DMC) has drawn much attention in recent years as an environmentally friendly versatile intermediate It has been used as a good solvent [1], an alkylation agent [2], and a substitute for highly toxic phosgene and dimethyl sulfate in many chemical processes [3,4]. Direct synthesis of DMC from CO2 and CH3OH has been reported as a most attractive route due to the low-cost of CO2 and the environmentally benign process [9,10,11,12,13,14]. Bian et al [16] studied the reaction over Cu–Ni/graphite nanocomposite catalyst in gaseous phase. They obtained 10.13% of CH3OH conversion and 89.04% of DMC selectivity at 105 °C. The effect of the reaction temperature, MWHSV, and time on stream on DMC synthesis was investigated
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