Abstract
Commercial CaO has been used as basic catalysts for tricomponent coupling biodiesel production using the reactant of methanol, rapeseed oil, and dimethyl carbonate (DMC) under mild reaction condition to produce no‐glycerol biodiesel. To enhance the catalytic efficiency, surface modification was carried out over commercial CaO. The yield of fatty acid methyl ester (FAME) was enhanced to 98.8% over 0.01% ethyl bromoacetate modified CaO at the oil/DMC/methanol ratio of 1:1:8 under 65°C in 6 h. Good performance of modified CaO in water‐contained reactant shows its high capacity of water resistance, which can be further confirmed by the humidity test of modified CaO in the vapor‐saturated atmosphere. The FT‐IR analysis confirms the chemical connection of modifier and CaO. The effect of surface modification on the physicochemical properties of CaO was evidenced by TGA, XRD, BET, CO2‐TPD, and SEM. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 257–262, 2016
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