Waste snail shell derived heterogeneous catalyst for biodiesel production by the transesterification of soybean oil.

A waste snail shell () derived catalyst was used to produce biodiesel from soybean oil at room temperature for the first time. The snail shell was calcined at different temperatures of 400-1000 °C. The synthesized catalysts underwent XRD, SEM, TEM, EDS, FTIR, XRF, TG/DTA and N adsorption-desorption isotherm (BET) analysis.