Abstract: “As environmental pollution increases due to greenhouse gas emissions the use of fuels obtained from renewable energy sources gain more interest. The majority of studies globally are related to the improvement of conventional biofuel production technologies by applying transesterification process of oil using alcohol and catalyst. Some of the more recent methods to produce biodiesel are based on heterogeneous catalysis, which has the advantage of easy separation of catalyst from the final product. Dolomite is a natural mineral rich in calcium compounds which can be converted to calcium oxide (CaO) which is known as a good catalyst used in heterogeneous biodiesel synthesis. In the present work, we investigated optimum conditions for biodiesel synthesis from rapeseed oil and methanol using dolomite as a heterogeneous catalyst. Firstly optimum conditions for dolomite preparation was studied. Optimum dolomite fraction size was obtained 0.315'0.1 mm and calcination temperature 850 °C was use”

Keywords: heterogeneous, catalysis, dolomite, biodiesel