共混法制备纳米KF/γ-Al₂O₃催化制备生物柴油的研究

通过共混法制备KF/γ-Al2O3纳米固体碱,以此为催化剂催化甲醇–油脂酯交换制备生物柴油。详细考察了KF负载量、共混反应温度、共混反应时间等因素对催化剂活性的影响,并与不同方法制备的KF/γ-Al2O3活性进行比较。实验结果显示,共混法制备的KF/γ-Al2O3的催化性能较浸渍法KF/γ-Al2O3明显提高。纳米KF/γ-Al2O3的最佳制备条件是:KF/γ-Al2O3摩尔比1.30:1,65℃反应2 h,300℃煅烧2 h。当醇/油比为8:1,催化剂用量5%,共混温度65℃,反应70 min生物柴油产率达到96.47%,与浸渍法KF/γ-Al2O3相比较,相同条件下生物柴油产率提高60%。

In this paper, the nano solid base catalyst was prepared over γ-Al2O3 particles supported with KF. The catalytic performance of nano catalyst for transesterification of methanol and rapeseed oil to biodiesel production has been investigated. The factors to influence the reaction activity including the loading of active component KF on the catalyst, the reacting temperature, reacting time, calcinating temperature and time were investigated. The experimental results show that catalytic property of nano catalyst prepared by blending was better than impregnation method. The nano solid alkali prepared at 65?C loaded with 1.30:1 molar ratio of KF?2H2O to γ-Al2O3, exhibits a high catalytic activity that higher biodiesel yield of 96.47%, which was 60% higher than the yield over KF?2H2O/γ-Al2O3 prepared by impregnation method.