Biodiesel production from high acid value oils with a highly active and stable bifunctional magnetic acid

Carbonaceous bifunctional magnetic solid acid catalyst with high acid content was synthesized by four-step method. It efficiently catalyzed the esterification of oleic acid, transesterification of soybean oil and pretreatment of Jatropha oil with easy separation for 10 cycles. （双功能磁性固体酸催化剂通过四步法合成和活化，用于酯化油酸，转酯化豆油和预处理小桐子油制备生物柴油，只需简单的磁性分离步骤可循环使用10次）。

Recently, Miss Yi-Tong Wang (PhD student from Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences) supervised by Prof. Zhen FANG has synthesized carbonaceous bifunctional magnetic solid acid catalyst with both Brønsted and Lewis sites to efficiently catalyze the esterification of oleic acid with 97% biodiesel yield, transesterification of mixed soybean oil with high acid value (AV) with 95% biodiesel yield and pretreat Jatropha oil with AV reduced from 17.2 to 0.7 mg KOH/g. Biodiesel yield > 90% at 90 oC for 4 h reaction time was obtained for ten cycles by easy magnetic separation which showed potential practical applications in the field of green production of biodiesel.

The results were published:

YT Wang, Zhen Fang*, XX Yang, Biodiesel Production from High Acid Value Oils with a Highly Active and Stable Bifunctional Magnetic Acid, Applied Energy, 204, 702–714(2017).

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高活性和稳定性的磁性固体酸催化剂催化高酸值的油脂制备生物柴油

最近，王一同同学（中国科学院西双版纳热带植物园博士研究生）在方老师的指导下，通过四步法合成了双功能磁性固体酸催化剂，并应用于生物柴油制备。

为了降低生物柴油制备工艺的能耗，通过四步法合成一种同时具有路易斯酸位点和布朗斯特酸位点的磁性固体酸。合成的磁性固体酸具有优秀的催化能力，可以酯化油酸获得97%生物柴油产率，转酯化高酸值的豆油获得95%生物柴油产率，预处理酸值为17.2 mg KOH/g的小桐子原油使其酸值降为0.7 mg KOH/g。合成的双功能磁性固体酸拥有较好的稳定性，通过简单的磁性分离可以循环使用10次，展示了出色的商业化应用前景。

结果发表在Applied energy: Yi-Tong Wang, Zhen Fang*, Xing-Xia Yang, Biodiesel Production from High Acid Value Oils with a Highly Active and Stable Bifunctional Magnetic Acid, Applied Energy, 204, 702–714(2017).