【摘要】 采用化学合成法制备了磁纳米Ca/Al/Fe₃O₄固体催化剂,并将其用于菜籽油与甲醇酯交换反应的研究。考察了磁纳米固体催化剂制备过程中Fe₃O₄搀杂量、煅烧温度、煅烧时间等条件对催化剂性能的影响,确定最优条件为n（Ca）:n（Fe）=5:1、煅烧温度600℃、煅烧时间6 h。同时采用XRD、SEM、BET、VSM等手段对磁纳米固体催化剂进行了表征。实验结果表明,最优条件下制备的磁纳米固体催化剂催化酯交换反应所得甲酯收率达到98.71%,催化剂回收率在93%以上。与纯的固体铝酸钙催化剂相比,磁纳米复合催化剂具有更高的催化活性和独特而便捷的回收方式。更多还原

【Abstract】 A magnetic composite solid catalyst was prepared by loading calcium aluminate onto Fe₃O₄ nanoparticles via a chemical synthesis method for transesterification reaction of biodiesel production.The optimum conditions for the catalyst preparation were investigated.The influences of the molar ratio of Ca to Fe,calcining temperature,calcining time on the catalytic performance have been studied.The catalyst with highest activity has been obtained when the molar ratio of Ca to Fe is 5:1;calcining temperature is 600℃and calcining time is 6 h.The catalyst was characterized by X-ray diffraction（XRD）,scanning electronic microscope（SEM）,Brunauer-Emmett -Teller method（BET） and vibrating sample magnetometer（VSM）.Furthermore,the magnetic composite solid catalyst show high catalytic activity for transesterification reaction for preparing biodiesel and the biodiesel yield reaches 98.71%under the optimum conditions.This catalyst shows magnetism and can be easily separated magnetically.Both the catalytic activity and the recovery rate of the magnetic composite solid catalyst were much higher than those of pure calcium aluminate catalyst.更多还原