writer：Siyuan Zou, Hao Zhang, Jianli Wang
keywords：transesterification, biodiesel, Pickering emulsion, ultrasound, response surface methodology
source：期刊
specific source：Journal of Oleo Science
Issue time：2023年

  皮克林界面催化剂(PIC)近年来被广泛应用于液-液反应中，它不仅能显著减小液滴尺寸和扩散距离来加强传质，而且为有价值活性位点的固定提供了一个灵活的平台。然而，催化剂流动性的限制在某种程度上降低了催化剂的活性。为了获得良好的反应效率，我们首次报道了一种利用Pickering乳液和超声概念协同增强双相反应的方法，以高效生产生物柴油为目标。采用基于Box-Behnken设计的响应面方法对催化剂组成、反应温度、超声功率、甲醇油摩尔比和催化剂用量等反应条件进行了优化。超声辅助皮克林界面催化在2.5 h内可获得98%以上的生物柴油，比超声辅助均相酯交换体系提高2倍以上。与机械搅拌辅助Pickering乳液体系相比，超声辅助Pickering乳液体系的反应时间缩短了3.6倍。

Recently, Pickering interfacial catalyst (PIC) was widely applied for liquid-liquid reactions, in view of not only intensifying the mass transfer through significant reducing both the drop sizes and the diffusion distance, but also supplying a flexible platform for the immobilization of valuable active sites. However, the restriction of the mobility of catalyst somehow decreases the activity of a catalyst. To obtain a promise reaction efficiency, we firstly report a synergistic method to enhance the biphasic reaction by Pickering emulsion and ultrasound concepts, targeted at efficient production of biodiesel. Response surface methodology based on Box-Behnken design was applied to optimize the reaction conditions, such as composition of catalyst, reaction temperature, ultrasound power, methanol to oil molar ratio and catalyst amount. An over 98% yield of biodiesel could be achieved within 2.5 hours by ultrasound assisted Pickering interfacial catalysis, which is over two times higher than that of ultrasound assisted homogeneous transesterification system. Besides, the ultrasound assisted Pickering emulsion shortened the reaction time by 3.6 fold when compared to mechanical stirring assisted Pickering emulsion system.

  DOI: 10.5650/jos.ess22340

  这项工作得到了国家自然科学基金的支持中国基金(资助项目22178317、22109138)，浙江省自然科学基金(LY18B040004)和中国博士后科学基金(2020M671790)。