Preparation of magnetic core-shell CaO-MgO@CoFe2O4 solid base and its catalytic performance in the transesterification of soybean oil to biodiesel
A magnetic core-shell CaO-MgO@CoFe2 O4 solid base was prepared with oxalates as the precursor through a two-step method, which was used as the catalyst for the transesterification of soybean oil to biodiesel with methanol. The CaO-MgO@CoFe2 O4 catalyst was characterized by magnetic hysteresis loop, X-ray diffraction ( XRD) , CO2-TPD and transmission electron microscopy ( TEM ); the effects of core-shell molar ratio, catalyst calcination temperature, reaction temperature, reaction time, methanol/oil molar ratio and catalyst amount on the yield of biodiesel were investigated. The results indicated that over the CaO-MgO@CoFe2 O4 catalyst with a core-shell molar ratio of 1:6 and calcined at 700 ℃, the biodiesel yield reaches 97 . 1% after conducting the transesterification reaction at 65℃ for 3 h, when the methanol/oil mol ratio is 12 and the amount of catalyst is 1. 0% by mass. The catalyst exhibits excellent reusability; the biodiesel yield remains above 90%after reusing for four cycles.
biodieselmagnetic solid base catalysttransesterificationsoybean oilCaO-MgOCoFe2 O4
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