Microwave heating (MW) is known for its efficacy in promoting transesterification for biodiesel production. However, the microwave-induced catalysis, linked to catalyst absorbing capability, remains poorly understood. Herein, a class of alkaline catalysts with strong microwave absorption were synthesized, validating their positive impact on transesterification. Various methods were used to reveal the relationship between microwave absorbing capacity and physicochemical properties of the synthesized catalyst (KF/Mg-MIL). Results indicated the previously recognized basicity’s role for KF/Mg-MIL was surpassed by microwave absorbing capability (permittivity and permeability) in MW (2.45 GHz). KF/Mg-MIL, with = 4.94′-1.09″ and = 1.03′-0.024″, efficiently transformed microwave into thermal energy via the dielectric loss and magnetic loss, saving 50 % energy consumption and reducing 1051.61 kg CO for per ton biodiesel compared to water bath heating (WB). Notably, “non-thermal” effect was observed with KF/Mg-MIL in MW, which reduced activation energy by 2.49 kJ/mol and increased the frequency factor by 793.32 min in comparison to WB.

中文翻译：

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用于通过 MIL-100(Fe) 生产生物柴油的微波吸收碱性催化剂：催化优化、表征、动力学和蒸馏模拟


微波加热 (MW) 因其在促进生物柴油生产的酯交换反应方面的功效而闻名。然而，与催化剂吸收能力相关的微波诱导催化作用仍然知之甚少。本文合成了一类具有强微波吸收的碱性催化剂，验证了它们对酯交换反应的积极影响。采用多种方法揭示了合成催化剂（KF/Mg-MIL）的微波吸收能力与物理化学性质之间的关系。结果表明，KF/Mg-MIL 的微波吸收能力（介电常数和磁导率）超过了先前认识的 KF/Mg-MIL 碱度作用（2.45 GHz）。 KF/Mg-MIL = 4.94′-1.09″ 和 = 1.03′-0.024″，通过介电损耗和磁损耗有效地将微波转化为热能，与每吨生物柴油相比，节省了 50% 的能耗，减少了 1051.61 kg CO 排放水浴加热（WB）。值得注意的是，在 MW 中观察到 KF/Mg-MIL 的“非热”效应，与 WB 相比，活化能降低了 2.49 kJ/mol，频率因子增加了 793.32 分钟。