Several kinds of catalysts prepared under different conditions (rice husk treatment temperature, the loading of CE on the RHA, and the calcination temperature of the eggshell-loaded RHA) were tested for converting palm oil to biodiesel.
In order to investigate and compare the activity of the as-prepared catalysts, the reactions were carried out under the following conditions: catalyst loading of 7 wt.%, methanol to-oil molar ratio of 9:1 and reaction time of 4 h, respectively.