Effect of Composition on the Structure and Catalytic Properties of KF/Mg-La Solid Base Catalysts for Biodiesel Synthesis via Transesterification of Cottonseed Oil
Effect of Composition on the Structure and Catalytic Properties of KF/Mg-La Solid Base Catalysts for Biodiesel Synthesis via Transesterification of Cottonseed Oil
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DOI：
10.1021/ef200378j
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发表时间：
2011-05
期刊：
影响因子：
5.3
通讯作者：
Ruili Song;Dongmei Tong;Jinqiang Tang;Changwei Hu
中科院分区：
文献类型：
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作者：
Ruili Song;Dongmei Tong;Jinqiang Tang;Changwei Hu
制备了一系列不同Mg/La质量比和KF负载量的固体碱（KF/Mg―La），并将其用于棉籽油酯交换合成生物柴油。采用ICP、XRD、CO2 ―TPD、TPDE和FTIR等手段对催化剂进行表征，探讨了催化剂组成与固体碱结构和碱性的关系。Mg/La质量比为3%、KF负载量为30.9%（wt/wt前驱体）的催化剂具有最高的催化活性。在醇油物质的量比为12：1、催化剂用量为5%（wt/wt油）、反应温度为65 °C、反应时间为1h的最佳反应条件下，在30.9%KF/M3 L上的TOF可达3.28 × 10 ―2 mols ―1 mol ―1。计算得到的Arrhenius反应活化能为54.74 kJ·mol-1。
A series of solid bases (KF/Mg―La) with different Mg/La mass ratios and varied KF loadings were prepared, and applied to biodiesel synthesis by transesterification of cottonseed oil. ICP, XRD, CO 2 ―TPD, TPDE, and FTIR were employed to characterize the catalysts in order to reveal the correlation of the composition with the structure and the basicity of the solid bases. The catalyst with Mg/La mass ratio of 3% and 30.9% (wt/wt precursor) KF loading possessed the highest catalytic activity. Under the optimal reaction condition of methanol/oil molar ratio of 12: 1, reaction for 1 h at 65 °C, and 5% (wt/wt oil) catalyst amount, the TOF on 30.9% KF/M 3 L could reach 3.28 x 10 ―2 mol s ―1 mol ―1 . The Arrhenius activation energy was evaluated to be 54.74 kJ·mol ―1 .