The effect of the catalyst loading on the biodiesel yield was investigated by varying the catalyst loading from 3wt.% to 8wt.%.
As indicated in Fig. 7, the CaO and 30% RHA800-800 catalyst showed equilibrium biodiesel yields when the catalyst loading was 5 wt.% and 7 wt.%, respectively.
However, further increase in catalyst loading beyond its optimum value, a decreased yield was observed because of the difficulty in blending of the catalyst, reactant and product caused by the excessive applied catalyst.