Effect of addition of CaO and ZrO
2 to MgO/SiO
2 catalyst, which is effective for synthesis of High Quality BioDiesel (HiBD) was investigated using atmospheric agitated reactor at 430
°C and LHSV = 0.3 h
-1. Binary MgOCaO/SiO
2 and MgO-ZrO
2/SiO
2 catalysts and ternary MgO-CaO-ZrO
2/SiO
2 catalyst were prepared by the incipient wetness impregnation method. Physical properties of these catalysts were characterized by XRD and BET methods. Both the fatty acids and the triglycerides in waste cooking oil were converted into hydrocarbon gases, CO, CO
2, water and hydrocarbon oil. CaO- and/or ZrO
2-added catalysts gave higher CO
2 yields than MgO/SiO
2 alone, and showed lower acid values. These observation indicates that the added oxides promote the decarboxylation reactions. Iodine values also decreased to some extent by the addition of these oxides.
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