氧化钙和氟化钾负载高岭土固体碱催化制备新型生物柴油

以高岭土为载体,利用浸渍法制备了氧化钙和氟化钾负载高岭土固体碱(GCK);利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(FT-IR)和哈密特指示剂法等技术手段对催化剂进行表征;考察了KF负载量和反应条件对月桂酸甲酯(ML)与乙二醇单甲醚(EGME)酯交换反应制备新型生物柴油产率的影响。 结果表明,GCK碱强度(H_)在7.2~18.4之间,KCaF₃为主要活性组分,当氟化钾负载量为25%、EGME与ML摩尔比3.0、催化剂用量相对于ML的质量分数为4.5 %、120 ℃下反应2 h,新型生物柴油的收率高达97.1%。 最后对催化剂的重复利用性能进行了考察。

Production of the Novel Biodiesel over Potassium Floride and Calcium Oxide Loaded Kaolinite Solid Base Catalyst

A series of supported solid-base catalysts (GCK) was prepared by loading KF and CaO over kaolinite by impregnation. Their activity was investigated for the catalytic transesterification of methyl laurate (ML) with ethylene glycol monomethyl ether (EGME) to produce the novel biodiesel. The catalyst was characterized by X-ray diffraction, scanning electron microscopy and Hammett indicators methods. Moreover, the effect of loading amount of KF and main reaction parameters on the yield of novel biodiesel was examined. The base strength of the GCK (H_ value) varies from 7.2 to 18.4. The KCaF₃ phase is the main active sites in GCK. The highest yield of novel biodiesel reaches 97.1 % under 25% loading of KF over GCK, EGME/ML molar ratio of 3.0, 4.5% loading of the catalyst (relative to the ML) and reacting for 2 h at 120 ℃. At last, the recycle of the catalyst was investigated.