Fe‐O Clusters Anchored on Nodes of Metal–Organic Frameworks for Direct Methane Oxidation
Wenshi Zhao, Yanan Shi, Yuheng Jiang, Xiaofei Zhang, Chang Long, Pengfei An, Yanfei Zhu, Shengxian Shao, Yan Zhuang, Guodong Li, Zhiyong Tang
Abstract
Abstract Direct methane oxidation into value‐added organic oxygenates with high productivity under mild condition remains a great challenge. We show Fe‐O clusters on nodes of metal–organic frameworks (MOFs) with tunable electronic state for direct methane oxidation into C1 organic oxygenates at 50 °C. The Fe‐O clusters are grafted onto inorganic Zr 6 nodes of UiO‐66, while the organic terephthalic acid (H 2 BDC) ligands of UiO‐66 are partially substituted with monocarboxylic modulators of acetic acid (AA) or trifluoroacetic acid (TFA). Experiments and theoretical calculation disclose that the TFA group coordinated with Zr 6 node of UiO‐66 enhances the oxidation state of adjacent Fe‐O cluster due to its electron‐withdrawing ability, promotes the activation of C−H bond of methane, and increases its selective conversion, thus leading to the extraordinarily high C1 oxygenate yield of 4799 μmol g cat −1 h −1 with 97.9 % selectivity, circa 8 times higher than those modulated with AA.