<![CDATA[Biodiesel is one of the alternatives for the shortage of fossil fuel. In this experiment biodiesel from waste cooking oil which is made using an ozonation process was studied. The process is energy extensive and environmentally friendly because of the use waste cooking oil as a raw material and the experiment was carried out at low reaction temperature which is room temperature. Waste cooking oil was reacted with methanol, KOH as the base catalyst, and ozone that was continually flowed into a stirred reactor at 30oC and atmospheric pressure. The effect of rice hulk ash addition as the supporting catalyst on methyl esters concentrations was observed in this experiment. Two different types of ashes were used, namely black (heating at 350oC) and white (heating at 750oC) with the concentrations of 0.5; 1; 1.5% (w/w). Methyl esters products were characterized using GC apparatus for Short Chain Methyl Ester (SCME) and Long Chain Methyl Ester (LCME) concentrations. They were also analyzed in terms of density and viscosity. The ashes were characterized by XRD and BET. The highest amount of SCME was achieved at the white ash concentration of 1.5%. However, the ash additions seemed not significant on the LCME production. Thus, the white ash was more useful as a supporting catalyst than the black one.]]>
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