Fe‐O Clusters Anchored on Nodes of Metal–Organic Frameworks for Direct Methane Oxidation
作者:Wenshi Zhao、Yanan Shi、Yuheng Jiang、Xiaofei Zhang、Chang Long、Pengfei An、Yanfei Zhu、Shengxian Shao、Zhuang Yan、Guodong Li、Zhiyong Tang
DOI:10.1002/anie.202013807
日期:2021.3.8
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 Zr6 nodes of UiO‐66, while the organic terephthalic acid (H2BDC)
在温和条件下以高生产率将甲烷直接氧化成增值有机含氧化合物仍然是一个巨大的挑战。我们显示了在可调节电子状态下,金属-有机骨架(MOF)上的Fe-O团簇可在50°C下将甲烷直接氧化成C1有机含氧化合物。Fe-O团簇接枝到UiO-66的无机Zr 6节点上,而UiO-66的有机对苯二甲酸(H 2 BDC)配体被乙酸(AA)或三氟乙酸(TFA)的单羧酸调节剂部分取代。实验和理论计算表明,TFA基团与Zr 6配位UiO-66的节点由于其吸电子能力而增强了相邻Fe-O团簇的氧化态,促进了甲烷的CH键的活化并增加了其选择性转化率,从而导致C1的C1含氧化合物的收率异常高4799μmolg cat -1 h -1,选择性为97.9%,比AA调制的高约8倍。