Synthesis of dimethyl carbonate from CO2 and methanol catalyzed by CeO2
The green synthesis process of dimethyl carbonate from CO2 and methanol was researched with thermodynamic calculation.The effects of reaction temperature and pressure on Gibbs free energy △rG,equilibrium constant K and equilibrium conversion rate C were studied in the range of 0.1-8.0 MPa and 293.15-473.15 K.Furthermore,the effects of temperatures and pressures on the reaction performance were investigated by using CeO2 as the catalyst at a fixed reaction pressure of 8.0 MPa or a reaction temperature of 413.15 K,and the obtained results were compared with the results of thermodynamic calculations.The results show that CeO2 gives a good performance in the range of 373.15-473.15 K,and the increase of reaction pressure can reduce △rG and increase K and C,promoting the reaction in the positive direction.In addition,thermodynamic calculations show that the reaction pressure displays a more significant effect on the equilibrium constant under the condition of lower reaction temperature with different reaction pressure,and provides a theoretical reference for the development of highly active catalytic materials to catalyze the efficient synthesis of dimethyl carbonate from CO2and methanol at lower temperatures.
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