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Waste-ram-fat as a feedstock for biodiesel production using heterogeneous catalyst of kaolinite-clay impregnated calcium-oxide from chicken eggshell
Abstract
Synthesis of a catalyst (AKC-CE) from activated kaolinite clay (AKC) and chicken eggshells (CE) for biodiesel production using waste-ram-fat (WRF) was undertaken in this study. Characterisation studies of AKC, CE, and AKC-CE samples were investigated using various equipment such as X-ray fluorescence (XRF), X-ray diffraction (XRD), and High-resolution scanning electron microscope (HR-SEM) incorporated with Energy-dispersive X-ray spectroscopy (EDAX). The catalyst produced was tested for biodiesel production using WRF in a one-factor-at-a-time study of the process parameters. The XRD analysis showed that the main components of Al2(Si2O5)(OH)4, SiO2, and CaO are present in the AKC-CE catalyst. These compounds are commonly used as catalysts for biodiesel production.
The AKC-CE catalyst’s morphology also demonstrated a significant cavity containing irregular crystals, with numerous white flaky crystals. These characteristics show that the catalyst would be efficient for WRF transesterification for biodiesel production. The highest biodiesel yield of 81.33% was obtained at process parameters of MeOH: WRF molar ratio of 18:1, reaction time of 4 h, catalyst loading of 10% (w/w), and temperature of 70oC. The biodiesel produced with the developed catalyst has properties within the ASTM standard. The AKC-CE catalyst is effective for producing biodiesel from WRF. Using WRF and chicken eggshells as materials for sustainable energy may not pose more threat to food availability in the biodiesel production that meets the ASTM standard as established in the Nigerian Biofuel Policy. Therefore, an increase in the use of non-edible feedstock for biofuel production is recommended.