化学修饰富勒烯对电化学氢化大豆油脂的影响

Effects of Chemically Modified Fullerene on Electrochemically Hydrogenated Soybean Oils

摘要:

为解决纳米足球状富勒烯C60作为催化剂载体易聚集的问题，研究添加分散剂对负载铂的富勒烯C60（C60/Pt）催化剂的影响，利用固体聚合物电解质（Solid polymer electrolyte, SPE）电化学氢化反应装置对大豆油进行氢化。通过沉降试验、粒径及电位分析、透射电子显微镜、X射线衍射分析、催化剂活性分析等技术和方法，探究了不同分散剂的分散效果和化学修饰后富勒烯催化剂活性。结果表明：分散效果较好的分散剂为吐温-80（最佳添加量为0.25%）。根据X射线衍射分析可知，加入分散剂的催化剂衍射峰强度增加，结晶度变好。催化剂活性结果显示，氢化2 h后，添加0.25%吐温-80 C60/Pt（C60/Pt+）催化的氢化油碘值均低于C60/Pt催化所得到的氢化油碘值，表明加入分散剂有效提高催化剂的催化效率。研究结果为足球状富勒烯C60的高效氢化应用提供了数据积累。

Abstract:

In order to solve the problem that nanosized spherical fullerene C60 is prone to aggregation as a catalyst support, the effect of adding dispersants on the platinum-supported fullerene C60 (C60/Pt) catalyst was studied, and soybean oil was hydrogenated by using a solid polymer electrochemical hydrogenation reaction device. Through techniques and methods such as sedimentation experiments, particle size and potential analysis, transmission electron microscopy, X-ray diffraction analysis, catalyst activity analysis, etc., the dispersion effect of Tween-80 and polyethylene glycol-6000 surfactants and the activity of fullerene after chemical modification were explored. The results showed that according to particle size potential and transmission electron microscopy, it can be seen that too high or too low was not conducive to catalyst dispersion, and the dispersant with better dispersion effect was Tween-80 (the optimal amount was 0.25%). According to X-ray diffraction analysis, it can be seen that the 111 crystal surface represented by 39.76° in C60/Pt+ was sharper, which showed that the addition of dispersant had a significant impact on the crystallization state of Pt substances on the catalyst surface. The diffraction peak intensity of the catalyst added with the dispersant increased and the crystallinity became better. The catalyst activity results showed that after 2 h of hydrogenation, the iodine value of hydrogenated oil catalyzed by adding 0.25% Tween-80 C60/Pt (C60/Pt+) was lower the iodine value of hydrogenated oil obtained by C60/Pt catalyzed, indicating that C60/Pt+ had better catalytic activity. To sum up, the research chemically modified fullerene C60 by adding different contents and different types of dispersants, providing data accumulation and laying the foundation for the efficient hydrogenation of spherical fullerene C60.