Mg<sub>1+xsub>Ca<sub>1?<span style='font-style: italic'>xsub>O<sub>2sub> as reusable and efficient heterogeneous catalyst for the synthesis of glycerol carbonate via the transesterification of glycerol with dimethyl carbonate

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• 作者：M.S. Khayoon ; B.H. Hameed
• 关键词：Glycerol ; Glycerol carbonate ; Mixed oxide catalyst ; Fuel additives
• 刊名：Applied Catalysis A: General
• 出版年：2013
• 出版时间：10 September, 2013
• 年：2013
• 卷：466
• 期：Complete
• 页码：272-281
• 全文大小：2215 K

文摘

A reusable and highly active heterogeneous catalyst of the type Mg<sub>1+m>xm>sub>Ca<sub>1?m>xm>sub>O<sub>2sub> has been developed and thermally treated at 850 ¡ãC for 6 h. The catalytic activity was investigated during the transesterification of glycerol with dimethyl carbonate to synthesize the valuable glycerol carbonate. A typical Mg<sub>1.2sub>Ca<sub>0.8sub>O<sub>2sub> mixed oxides catalyst was characterized by BET surface area, surface base amount, CO<sub>2sub>-TPD, XRD and FTIR, and its microstructure was studied by the aid of scanning and transmission electron microscopy. The investigated characteristics gave a clear insight into the catalytic performance of the catalyst. Over 0.30 g of this catalyst, glycerol conversion was almost complete and the yield of glycerol carbonate was 100 % under atmospheric pressure. The best reaction conditions are: molar ratio of glycerol/DMC of 1:2, reaction temperature of 70 ¡ãC and 90 min of reaction time. The transesterification results showed that the synergism interaction between Ca and Mg species in the catalyst structure was the reason for its high activity.