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首页> 外文期刊>RSC Advances >Production of novel biodiesel from transesterification over KF-modified Ca-Al hydrotalcite catalyst
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Production of novel biodiesel from transesterification over KF-modified Ca-Al hydrotalcite catalyst

机译：在KF改性的Ca-Al水滑石催化剂上通过酯交换反应生产新型生物柴油

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A series of KF-modified Ca-Al hydrotalcite (xKF/HTL-M) solid base catalysts was prepared in methanol, and characterized by thermogravimetry analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and carbon dioxide temperature-programmed desorption (CO2-TPD). The catalytic activity was investigated in the transesterification of ethylene glycol monomethyl ether (EGME) with methyl laurate (ML) to produce a novel biodiesel of ethylene glycol monomethyl ether monolaurate (EGMEML). The effect of the mass content of KF and the main reaction parameters such as EGME to ML molar ratio, amount of catalyst, reaction time and temperature on the yield of EGMEML were examined. The results indicate that a new phase of KCaF3 formed in xKF/HTL-M, and acted as the main active sites for the transesterification. In addition, xKF/HTL-M has excellent catalytic performance in the production of EGMEML. The highest yield of 97.7% was obtained over 24.7KF/HTL-M at EGME/ML molar ratio of 3.0, catalyst amount of 5 wt%, and reaction time of 4 h at 120 degrees C. Moreover, the catalyst displays a good stability and reutilization. A satisfactory yield of 90% was obtained after use for five consecutive cycles without significant deactivation. Finally, the activation energy (E-a) of the reaction of EGME with ML over 24.7KF/HTL-M was obtained as 27.11 kJ mol(-1).
机译：在甲醇中制备了一系列KF改性的Ca-Al水滑石（xKF / HTL-M）固体碱催化剂，并通过热重分析（TG-DTA），X射线衍射（XRD），扫描电子显微镜（SEM）进行了表征。和二氧化碳程序升温脱附（CO2-TPD）。在乙二醇单甲醚（EGME）与月桂酸甲酯（ML）的酯交换反应中研究了催化活性，以生产新型的乙二醇单甲醚单月桂酸酯（EGMEML）生物柴油。研究了KF质量含量和主要反应参数如EGME与ML的摩尔比，催化剂用量，反应时间和温度对EGMEML收率的影响。结果表明，在xKF / HTL-M中形成了KCaF3的新相，并作为酯交换反应的主要活性位点。此外，xKF / HTL-M在EGMEML的生产中具有出色的催化性能。 EGME / ML摩尔比为3.0，催化剂量为5 wt％，反应时间为120℃，反应时间为4 h时，在24.7KF / HTL-M上，收率最高，为97.7％。和再利用。在连续五个循环中使用后，在没有明显失活的情况下获得了令人满意的90％的收率。最终，EGME与ML在24.7KF / HTL-M上反应的活化能（E-a）为27.11 kJ mol（-1）。

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