One-step production of biodiesel from oils with high acid value by activated Mg-Al hydrotalcite nanoparticles

Activated Mg-Al hydrotalcite nanoparticles (<45 nm) were synthesized. The catalyst presented both acidic and basic to produce biodiesel from oils with high acid value (AV). Biodiesel yield reached 93.4% and 92.9% from Jatropha and soybean oils with AV of 6.3 and 12.1 mg KOH/g. The catalyst can recycle 4 times with Jatropha biodiesel yield >86%.77