Ultrasound-assisted Pickering Interfacial Catalysis for Transesterification: Optimization of Biodiesel Yield by Response Surface Methodology
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
皮克林界面催化劑(PIC)近年來被廣泛應用于液-液反應中，它不僅能顯著減小液滴尺寸和擴散距離來加強傳質，而且為有價值活性位點的固定提供了一個靈活的平臺。然而，催化劑流動性的限制在某種程度上降低了催化劑的活性。為了獲得良好的反應效率，我們首次報道了一種利用Pickering乳液和超聲概念協同增強雙相反應的方法，以高效生產生物柴油為目標。采用基于Box-Behnken設計的響應面方法對催化劑組成、反應溫度、超聲功率、甲醇油摩爾比和催化劑用量等反應條件進行了優化。超聲輔助皮克林界面催化在2.5 h內可獲得98%以上的生物柴油，比超聲輔助均相酯交換體系提高2倍以上。與機械攪拌輔助Pickering乳液體系相比，超聲輔助Pickering乳液體系的反應時間縮短了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
這項工作得到了國家自然科學基金的支持中國基金(資助項目22178317、22109138)，浙江省自然科學基金(LY18B040004)和中國博士后科學基金(2020M671790)。