This study is focused on the transesterification of the soybean oil into biodiesel using magnetic based solid catalysts (LiFe₅O₈-LiFeO₂). The catalyst was prepared through a simple solid-state reaction that involved mixing and grinding iron oxide (Fe₂O₃) and Li₂CO₃. The results demonstrated that the catalyst was ferromagnetic. Under the optimal reaction conditions, the highest FAME conversion in the transesterification of soybean oil can reach 96.5% by using LiFe₅O₈-LiFeO₂ catalyst. The LiFe₅O₈-LiFeO₂ demonstrates excellent catalytic activities and it could be recovered by magnetic separation. The LiFe₅O₈-LiFeO₂ can be easily recovered and reused without significant deactivation.

这项研究的重点是使用基于磁性的固体催化剂（LiFe ₅ O ₈ -LiFeO ₂）将大豆油酯交换为生物柴油。通过简单的固态反应制备催化剂，该反应涉及混合和研磨氧化铁（Fe ₂ O ₃）和Li ₂ CO ₃。结果表明该催化剂是铁磁性的。在最佳反应条件下，使用LiFe ₅ O ₈ -LiFeO ₂催化剂，大豆油酯交换反应中的最高FAME转化率可达到96.5％。LiFe ₅ O ₈ -LiFeO ₂具有良好的催化活性，可以通过磁分离法回收。LiFe ₅ O ₈ -LiFeO ₂可以容易地回收和再利用而没有明显的失活。