Fe–Zn double-metal cyanide complexes catalyzed biodiesel production from high-acid-value oil

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• 作者：Fang Yan^a ; ^b ; Zhenhong Yuan^a ; Pengmei Lu^a ; ^{lvpm@ms.giec.ac.cn} ; Wen Luo^a ; Lingmei Yang^a ; Li Deng^b
• 关键词：Double-metal cyanides (DMC) ; Solid Fe– ; Zn catalysts ; Biodiesel
• 刊名：Renewable Energy
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：36
• 期：7
• 页码：2026-2031
• 全文大小：602 K

文摘

A kind of solid catalyst of Fe(Ⅱ)–Zn double-metal cyanide (DMC) complexes was prepared through co-reaction of potassium ferrocyanide, zinc chloride and complexing agent of tert-butanol. This catalyst was characterized by using several techniques such as XRD, TG/FT-IR, EA, BET and SEM. And it proved to be highly active for the simultaneous transesterification of triglycerides and esterification of free fatty acids (FFAs). Results show that the catalyst has a hybrid-structure comprised of both crystal and amorphous species. Its good water-resistance depends on the amorphous state, which has surface hydrophobicity. Zn²⁺ may be the active site of catalysis. The effect of various factors on the reaction was also studied, including different co-complexing agents, DMC concentration, reaction temperature, methanol/oil molar ratio, reaction time, water and fatty acid content and so on. The yield rate reached 98 % under the optimum conditions, and the recovery rate maintained more than 90 % after 10 batches.