SYNTHESIS OF A HETEROGENEOUS CaO-SiO2 CATALYST FROM CRAB SHELLS AND RICE HUSKS FOR OLEIC ACID CONVERSION
Main Article Content
Abstract
Biodiesel is considered a renewable, sustainable, and environmentally friendly energy source that can replace fossil fuels. Biodiesel can be produced either by esterification of fatty acids or transesterification of triglycerides. In this study, crab shells were recycled as a source of CaO. CaO was combined with SiO2 from rice husks to form a new heterogeneous catalyst for esterification. The catalyst was characterized using XRD, FT-IR, and SEM-EDX. Synthesized CaO and CaO-SiO2 were used for esterification of oleic acid. The effects of catalyst type, temperature, reaction time, and MeOH:oleic acid molar ratio were investigated. The results revealed that the addition of SiO2 could improve the reaction rate while increasing the calcination temperature enhanced the activity of the CaO-SiO2 catalyst. The reaction temperature and time affected oleic acid conversion more significantly than the MeOH:oleic acid molar ratio. The highest conversion (78.49%) was achieved at 68 °C for 7 h, with a catalyst loading of 10 wt% CaO-SiO2 (900 °C) and a MeOH:oleic acid molar ratio of 10:1.
Keywords
Biodiesel, CaO-SiO2, crab shell, esterification, oleic acid, rice husk
Article Details
References
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