| With sodium oxalate as precipitant，a series of heterogeneous basic catalysts of CaO-CeO2 with different molar ratios were synthesized by co-precipatation. The catalysts were characterized by XRD，ICP, BET and CO2-TPD, and the actual Ca/Ce ratio, specific surface area and basicity of these catalysts added with Ca and Ce were examined, also the calalysts were used in transesterification reaction. The results showed that Ca and Ce produced good synergistic effects and the better structures emerged compared with pure CaO. Under the conditions of Ca/Ce ratio 1, calcination temperature 700?℃, dosage of catalyst 3%, ratio of methanol to palm oil 12∶?1, reaction temperature 65?℃ and reaction time 6 h, the yield exceeded 97%. The acid resistance and water resistance of the catalyst were excellent compared with pure CaO. Meanwhile, the used catalyst could be regenerated by ethanol washing and calcination at 700?℃ for 3 h and it still had good catalysis activity after reused four cycles with yield above 80%. |
