Ramagani, Asyh Rasidu2023-04-102023-04-102023-01PerpustakaanElfitrahttps://repository.unri.ac.id/handle/123456789/10922Calcium Oxide (CaO) is a heterogeneous base catalyst that is often used in the biodiesel production, one of the sources of CaO is blood cockle shells (Anadara granosa). Attempted to modify CaO with SiO2 quartz sand to increase its catalytic activity in the synthesis of biodiesel. This study aims to determine the effect of adding SiO2 to the CaO catalyst on the yield of biodiesel produced. Characterization of the CaO-SiO2 catalyst produced by the BET method showed that the surface area increased with increasing amount of SiO2. Based on the FTIR data, there are OH functional groups showing Ca(OH)2, Si-O-Si asymmetric stretching vibrations and Ca-O groups. The maximum biodiesel yield was obtained on a 5% CaO-SiO2 catalyst, which was 70.76% at the condition of an oil:methanol mole ratio of 1:9 with a reaction time of 90 minutes and a catalyst weight of 2 g.enbiodieselcatalystCaO-SiO2.Article