| dc.description.abstract | Biodiesel as an environmentally friendly alternative fuel is produced by
considering the best operating conditions with the help of a catalyst to increase
biodiesel yield. Heterogeneous catalysts can be produced from indigofera leaves
(Indigofera zollingeriana). This study aims to characterize the calcined indigofera
leaf ash as a catalyst in the manufacture of biodiesel, evaluate t he best
temperature of the calcination of indigofera leaf ash at 500, 600, 700, and 800 °C
for 3 hours as a catalyst in the manufacture of biodiesel and apply the resulting
indigofera leaf ash as a heterogeneous catalyst in the manufacture of biodiesel
fro m RBDPO. The research procedure is manufacturing an indigofera leaf ash
catalyst with a particle size passing a 100 mesh sieve, which is calcined using a
furnace at a temperature of 700 °C for 3 hours. The biodiesel transesterification
stage involves RBDPO heated at various temperatures of 55, 60, and 65 °C,
methanol was added with a molar ratio of 6:1, 9:1, and 12:1 to oil and catalysts
of 1%, 2%, 3%, and 4% by weight. The reaction was carried out with a magnetic
stirrer stirring at 300 rpm for 90, 120, 15 0, and 180 minutes. Based on the results
of the study, the highest biodiesel yield was obtained at 94.20% at a calcination
temperature of 700 OC, a catalyst amount of 3%, a reaction temperature of 60 OC,
a mole ratio of oil to methanol of 1:9, and a reacti on time of 120 minutes.
Analysis using Gas Chromatography on the significant composition of RBDPO
fatty acids and biodiesel, namely oleic acid and palmitic acid. Based on the
analysis using Energy Dispersive X ray Spectroscopy, X ray diffraction, and
Fouri er Transform Infra Red, it was confirmed that a calcium component was the
target in Indigofera leaf ash. Based on the analysis using Brunner Emmet Teller
(BET) Barrett Joyner Halenda (BJH), the surface area was 9.318 m 2 /g, the pore
volume was 0.047 cc/g, and the pore size was 87.240 Å in the indigofera leaf ash
catalyst. Therefore, the indigofera leaf ash catalyst can be utilized in s ustainable
biodiesel production | en_US |
