作　　者： ; ; ; ; ; ;

机构地区： 浙江海洋学院石油化工学院

出　　处： 《燃料化学学报》 2010年第4期415-421,共7页

摘　　要： 制备了具有磁性和催化活性的双功能催化剂CaO/MgO/Fe3O4,用于催化花生油酯交换制备生物柴油的清洁生产过程。对CaO/MgO/Fe3O4进行了XRD、TEM、FT-IR和磁性等表征分析,探讨了CaO/MgO/Fe3O4催化剂的重复利用性能。结果表明,用Mg(Ac)2溶液等体积浸渍磁性基质Fe3O4,在N2气氛中600℃焙烧2 h,可得到具有磁性的载体5%MgO/Fe3O4;再用Ca(Ac)2溶液等体积浸渍MgO/Fe3O4,并在N2气氛中700℃煅烧,得到具有磁性且催化活性较高的催化剂10%CaO/MgO/Fe3O4。该催化剂具有核壳结构,磁核平均直径约为35 nm。在催化剂用量10%,醇油摩尔比12∶1,反应温度65℃,反应2 h的条件下酯交换转化率可达90%以上。在磁场的吸引下该催化剂能快速与反应体系分离,催化剂回收率达90%。但CaO/MgO/Fe3O4重复利用性能较差,其原因是在搅拌反应过程中催化活性组分逐渐从催化剂上脱落所致。 A novel solid base catalyst,CaO/MgO/Fe3O4 with magnetism used for production of clean biodiesel,was prepared and characterized by X-ray diffraction,transmission electron microscope,infrared spectrum and magnetism analysis.The catalytic activities of the fresh and the reused catalysts for the transesterification of peanut oil with methanol to produce biodiesel were investigated.The magnetic support of MgO/Fe3O4 with MgO loading of 5% was obtained by the magnetic matrix Fe3O4 dipped in Mg（Ac）2 aqueous solution and then calcined at 600 ℃ in N2.And CaO/MgO/Fe3O4 with CaO loading of 10% was prepared by MgO/Fe3O4 impregnated in Ca（Ac）2 aqueous solution and further calcined at 700 ℃ in N2.The particle of CaO/MgO/Fe3O4 was shell-core structure with the core mean diameter of 35 nm.The results show that CaO/MgO/Fe3O4 has higher catalytic activity for transesterification reaction and could be separated easily from the reaction products in magnetic field.Both the conversion of peanut oil and recovery of the catalyst are above 90% under the conditions of atmospheric pressure,65 ℃ for 2 h,methanol/oil mol ratio of 12,and catalyst dosage（catalyst/oil） of 10%.The falling off of CaO from CaO/MgO/Fe3O4 during stirring reaction process was speculated as one of the reasons for the lower activity of the reused catalyst.

关 键 词： 生物柴油 磁性固体碱催化剂 反应转化率 催化剂回收率

领　　域： [石油与天然气工程]