The catalysts derived from waste shells were employed to produce biodiesel from Jatropha curcas oil. The catalysts were characterized by scanning electron microscopy, Fourier transform infrared, and powder X-ray diffraction studies. Under the best reaction conditions (temperature 65 degrees C, methanol/oil molar ratio 9: 1, reaction time 3 h, and catalyst loading 3 wt% of oil), a high biodiesel yield of more than 99.0% was obtained. After ultrasonic mixing, the time for reaction completion could be shortened. After reuse for seven times, about 75% of the fatty acid methyl esters yield could be obtained. The activity of the catalysts could be revived absolutely after recalcination.