Optimization of Catalyst Synthesis Using Ornamental Stone Waste Supported on Activated Carbon for Enhancing Biodiesel Production Efficiency.

In that study, they showed that the amounts of metals leached into the produced biodiesel was quite significant (374.5 mg/kg of Ca 12.6 mg/kg of Mg) when the material obtained after heat treatment of OSW was used as catalyst; on the other hand, when activated carbon was used as support, the leaching of Ca (<0.76 mg/kg) and Mg (<0.15 mg/kg) remained below the limits established by the European standard EN-14214.

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