the experimental results revealed that 30% RHA-800 exhibited the highest catalytic activity.More specifically, when the reaction was carried out with a reaction time of 4 h, methanol-to-oil molar ratio of 9:1,and catalyst loading of 7 wt%,the biodiesel yield could reach 91.5%, besides,after reused for more than 8 cycles,the catalyst could still possess a rather high biodiesel yield (80%)