<![CDATA[Commercial biodiesel of oil palm is controversial as the palm oil is classified as food oil and palm plantation utilizesfertile land. One potential type of vegetable oil as biodiesel raw material is kemiri sunan (Reutealis trisperma(Blanco) Airy Shaw) oil. This research aimed to prepare a heterogeneous solid catalyst in the form of an impregnatedSiO2by CaO catalyst (CaO/SiO2), to study the effect of the esterification stage on free fatty acid (FFA) content ofoil, and to test the activity of the CaO/SiO2catalyst during the trans-esterification stage for biodiesel formation. CaO/SiO2catalysts were prepared by sol-gel method made from natural materials (egg shells and rice husk). The FFAcontent of kemiri sunan oil was determined through various esterification stages namely 1; 1.5; and 2 hours in thepresence of H2SO4catalyst. While the trans-esterification stage was carried out under reaction temperature of 60°C,oil to methanol ratio of 1:9, reaction time of 2 hours and CaO/SiO2catalyst content of 3%. The results showed thatthe esterification stage for 1; 1.5; and 2 hours reduced the FFA content from 12.5% (without esterification) to 0.65%;0.58%; and 0.54% respectivaly. Biodiesel made from kemiri sunan oil which was synthesized with the addition ofCaO/SiO2catalyst at optimal conditions of trans-esterification stage fulfilled SNI 7182-2015: Biodiesel based ondensity, viscocity, moisture content, iodine number, and cetane number.]]>
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