Direct synthesis of dimethyl carbonate from CO2 and methanol over CeO2 catalysts of different morphologies

Journal of Chemical Sciences

UNNIKRISHNAN P¹  SRINIVAS DARBHA¹ 

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关键词: $CO_{2}$ utilization;    dimethyl carbonate;    ceria;    acid-base catalysis;    influence of morphology.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

The direct synthesis of dimethyl carbonate (DMC) from carbon dioxide CO2 and methanol is an attractive approach towards conversion of the greenhouse gas - CO2 into value-added chemicals and fuels.Ceria CeO2 catalyzes this reaction. But the conversion efficiency of CeO2 is enhanced when the byproductwater in the reaction medium is separated by employing trapping agents like 2-cyanopyridine (2-CP). In thiswork, the influence of morphology of CeO2 on the direct synthesis of DMC in presence of 2-CP is reported.CeO2 catalysts of cube, rod, spindle and irregular morphology (Ce - C, Ce - R, Ce - S and Ce - N, respectively)were prepared, characterized and studied as catalysts in the said reaction conducted in a batch mode. Amongall, Ce - S shows superior catalytic performance with nearly 100 mol% of DMC selectivity. Catalytic activitycorrelates with the concentration of acid and base sites of medium strength as well as defect sites. Ce - S has anoptimum number of these active sites and thereby shows superior catalytic performance.

【 授权许可】

Unknown