Abstract
Abstract A series of layered double hydroxides (MgxAl-LDHs) catalysts is successfully prepared and effectively transesterificated triglycerides to produce biodiesel and glycerol carbonate, respectively. MgxAl-LDHs catalysts are synthesized by changing the Mg/Al ratio of the LDH hosts and fully characterized by several techniques, including XRD, N2 adsorption, SEM. The effects of ratios of Mg/Al catalyst, reaction temperature, catalyst dosage are thoroughly investigated to determine the optimal reaction conditions. A yield of biodiesel and glycerol carbonate could reach up to 87.5% and 93.4%, respectively, over Mg5Al-LDHs catalyst under batch condition. The transesterification glycerol for glycerol carbonate is successfully carried out in a stirring packed-bed reactor with MgxAl-LDHs coating on the spherical α-Al2O3 catalysts. Additionally, extra-particle mass transfer and intra-particle diffusion do not control the reaction rate. The yield of glycerol carbonate could reach up to 80.2% over Mg5Al-LDHs/α-Al2O3 catalyst.
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More From: Journal of the Taiwan Institute of Chemical Engineers
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