Citation: Yue-Ying YAN, Yue LI, Jie DENG, Xi ZHAO, Na TA, Yong-Dong CHEN. Direct Synthesis of Dimethyl Carbonate from CO2 and Methanol by Mg-Doped Ceria Monolithic Catalyst[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(7): 1402-1410. doi: 10.11862/CJIC.2022.139 shu

Direct Synthesis of Dimethyl Carbonate from CO2 and Methanol by Mg-Doped Ceria Monolithic Catalyst

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  • In this paper, Ce1-xMgxO2 (x=0.05, 0.10, 0.15, 0.20) solid solution catalytic materials with different molar ratios were successfully synthesized by co-precipitation method. These materials were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), nitrogen adsorption-desorption test, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), CO2 temperature-programmed desorption (CO2-TPD) and other techniques. It was found that the particle size, specific surface area, surface defects, etc. of the prepared Ce1-xMgxO2 catalytic materials can be tuned by regulating the content of Mg in the CeO2 lattice. Among them, Ce0.90Mg0.10O2 exhibited the best surface properties, with the smallest average particle size of about 5.8 nm, the largest specific surface area of about 136 m2·g-1, and the highest surface oxygen content (31.98%). Ce1-xMgxO2 catalytic material was coated on the cordierite honeycomb ceramic to make a monolithic catalyst, and its catalytic performance for the direct synthesis of dimethyl carbonate from CO2 and CH3OH was investigated. Under the conditions of 140℃, 2.4 MPa, and 2 h reaction, the yield of dimethyl carbonate on Ce0.90Mg0.10O2 monolith catalyst was as high as 20.21%, and the catalytic activity was significantly higher than that of CeO2 and other Ce1-xMgxO2 (x=0.05, 0.15, 0.20) catalytic materials.
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