Although heterogeneous catalysts can be seperated from reaction media easily, catalyst efficiency is often decreased compared to homogeneous counterparts. In this study, catalytic oxidation of thymol and carvacrol were investigated using micron and nano‐sized PCN‐222(Fe) as heterogeneous catalysts and water soluble Fe‐porphyrin complex (FePTC) as homogeneous catalyst in the presence of peroxymonosulfate (PMS). Fe‐porphyrin complexes is well‐known catalyst for oxidation reactions. PCN‐222(Fe), a Zr‐based mesoporous MOFs utilizing porphyrin as organic linker, exhibits similar catalytic performance compared to FePTC for the first use. However, higher conversion values were achieved in PCN‐222(Fe) for the second cycles compared to the homogeneous systems highlighting the importance of heterogeneous MOF system. Thymoquinone (TQ) selectivities of the carvacrol oxidation are 5 and 8 times higher than homogeneous system in the second cycle for nano‐ and micro‐PCN222(Fe), respectively. Importantly, PCN‐222(Fe) can be used for at least 3 cycles with the reduced PMS:catalyst mole ratio.

中文翻译：

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卟啉异构化成PCN-222作为氧化催化剂：在可重用性方面的比较

尽管非均相催化剂可以轻松地从反应介质中分离出来，但与均相催化剂相比，催化剂效率通常会降低。在这项研究中，在过氧一硫酸盐（PMS）存在的情况下，使用微米级和纳米级PCN-222（Fe）作为多相催化剂，水溶性铁卟啉配合物（FePTC）作为均相催化剂，研究了百里酚和香芹酚的催化氧化。铁卟啉配合物是氧化反应的知名催化剂。利用卟啉作为有机连接基的Zr基介孔MOF PCN-222（Fe）与首次使用的FePTC相比具有类似的催化性能。但是，与同质系统相比，PCN-222（Fe）在第二个循环中实现了更高的转换值，突出了异构MOF系统的重要性。在纳米和微米级PCN222（Fe）的第二个循环中，香芹酚氧化的胸苷（TQ）选择性分别比均相系统高5倍和8倍。重要的是，PCN-222（Fe）可以在降低的PMS：催化剂摩尔比的情况下至少使用3个循环。