Krutpijit Chadaporn, Jongsomjit Bunjerd
Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University.
J Oleo Sci. 2017;66(12):1355-1364. doi: 10.5650/jos.ess17118.
Montmorillonite clay (MMT) is one of materials that can be "green material" due to its environmental safety. In this work, acid-activated MMT catalysts were prepared for the dehydration reaction of ethanol. To be the green process, the reaction with bioethanol was also studied. Ethanol concentrations in feed were varied in the range of 10-99.95 wt%. Moreover, the concentrations of hydrochloric acid activated MMT were investigated in range of 0.05-4 M. From the experiment, it reveals that different acid concentrations to activate MMT affect the catalytic activity of catalysts. The 0.3 M of HCl activated MMT exhibits the highest activity (under the best condition of 30 ml HCl aging for 1 h) with the Si/Al ratio of 7.4. It can reach the ethanol conversion and ethylene selectivity up to 95% and 98% at reaction temperature of 400°C, respectively. For the several ethanol feed concentrations, it does not remarkably affect in ethanol conversion. However, it has some different effect on ethylene selectivity between lower and higher reaction temperatures. It was found that at lower temperature reaction, ethylene selectivity is high due to the behavior of water in feed. In addition, the 0.3 M-MMT can be carried out under the hydrothermal effect.
蒙脱石粘土（MMT）因其环境安全性而成为可作为“绿色材料”的材料之一。在本工作中，制备了酸活化蒙脱石催化剂用于乙醇脱水反应。为实现绿色工艺，还研究了与生物乙醇的反应。进料中乙醇浓度在10 - 99.95 wt%范围内变化。此外，研究了盐酸活化蒙脱石的浓度范围为0.05 - 4 M。实验表明，不同酸浓度活化蒙脱石会影响催化剂的催化活性。0.3 M盐酸活化的蒙脱石表现出最高活性（在30 ml盐酸老化1 h的最佳条件下），硅铝比为7.4。在400°C反应温度下，其乙醇转化率和乙烯选择性分别可达95%和98%。对于几种乙醇进料浓度，对乙醇转化率没有显著影响。然而，在较低和较高反应温度下，对乙烯选择性有不同影响。发现在较低温度反应时，由于进料中水的行为，乙烯选择性较高。此外，0.3 M - MMT可在水热效应下进行。
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