Green synthesis of hydrocalumite-type compounds and their evaluation in the transesterification of castor bean oil and methanol

► Hydrocalumite-like compounds prepared by a simple and environmentally-friendly method. ► Catalyst precursor for biodiesel production. ► Thermal treatment enhanced biodiesel obtaining. ► Full conversion of the raw materials was achieved with the annealed sample at 700 °C. ► The catalyst deactivation was caused by the active phase leaching.