Abstract Magnetic nanoparticles (MNP) of Ni 0.5 Zn 0.5 Fe 2 O 4 , successfully synthesized by combustion reaction, with special differential in the production, starting from the scale of 10 g/production to a pilot-scale reproducibility of up to 200 g/production, were used and reused as heterogeneous magnetic nanocatalysts in the reactions of biodiesel production. The obtained nanocatalysts were highly efficient in the biodiesel production with soybean oil, such by the methyl as ethyl routes. It was obtained the best activity in the esterification reaction, favoring conversions of up to 99.54 ± 0.16% on the methyl route and up to 99.38 ± 0.18% on the ethyl route. As regards transesterification, the maximum conversion achieved was 14%. Biodiesel was characterized in terms of viscosity, density, acidity and iodine ratios, whose obtained values place the produced biodiesel within the specifications applicable to the quality standards for its commercialization. MNP were characterized by XRD, BET, TEM, AGM and TPD. Besides, the nanocatalyst was recovered with the help of a simple external magnetic field (magnet) and reused in another 3 cycles, without significant loss in the catalytic activity, indicating considerable stability. Therefore, the nanoferrite Ni 0.5 Zn 0.5 Fe 2 O 4 can be validated as a new environmentally correct catalyst for the heterogeneous catalysis in the field of biodiesel production.

中文翻译：

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生物柴油生产评估磁性纳米催化剂 Ni0.5Zn0.5Fe2O4 的使用和再利用

摘要 Ni 0.5 Zn 0.5 Fe 2 O 4 磁性纳米粒子（MNP），通过燃烧反应成功合成，具有特殊的生产差异，从10 g/生产规模到中试规模再现性高达200 g/生产，在生物柴油生产反应中作为异质磁性纳米催化剂使用和重复使用。所获得的纳米催化剂在使用大豆油生产生物柴油中具有很高的效率，例如通过甲基和乙基路线。它在酯化反应中获得了最佳活性，有利于甲基路线的转化率高达 99.54 ± 0.16%，乙基路线的转化率高达 99.38 ± 0.18%。至于酯交换，所达到的最大转化率为 14%。生物柴油的特征在于粘度、密度、酸度和碘比，其获得的值使生产的生物柴油符合适用于其商业化质量标准的规格。MNP 通过 XRD、BET、TEM、AGM 和 TPD 进行表征。此外，纳米催化剂在简单的外部磁场（磁铁）的帮助下被回收并在另外 3 个循环中重复使用，催化活性没有显着损失，表明具有相当大的稳定性。因此，纳米铁氧体Ni 0.5 Zn 0.5 Fe 2 O 4 可以作为生物柴油生产领域的多相催化的新型环保催化剂被证实。纳米催化剂在简单的外部磁场（磁铁）的帮助下被回收，并在另外 3 个循环中重复使用，催化活性没有显着损失，表明相当稳定。因此，纳米铁氧体Ni 0.5 Zn 0.5 Fe 2 O 4 可以作为生物柴油生产领域的多相催化的新型环保催化剂被证实。纳米催化剂在简单的外部磁场（磁铁）的帮助下被回收，并在另外 3 个循环中重复使用，催化活性没有显着损失，表明相当稳定。因此，纳米铁氧体Ni 0.5 Zn 0.5 Fe 2 O 4 可以作为生物柴油生产领域的多相催化的新型环保催化剂被证实。