Characterization of calcium oxide catalysts from natural sources and their application in the transesterification of sunflower oil

- Crab shell and eggshell calcined were evaluated as catalyst for biodiesel.
- These materials are composed of CaCO3, which are converted into CaCO3 and CaO.
- These mixed oxides showed catalytic activity to oils due to its basic properties.
- Biodiesel conversion was optimized analyzing the effect of the reaction conditions.