Metal Nanocrystals Embedded in Single Nanocrystals of MOFs Give Unusual Selectivity as Heterogeneous Catalysts
作者:Kyungsu Na、Kyung Min Choi、Omar M. Yaghi、Gabor A. Somorjai
DOI:10.1021/nl503007h
日期:2014.10.8
The growth of nanocrystalline metal–organic frameworks (nMOFs) around metal nanocrystals (NCs) is useful in controlling the chemistry and metric of metal NCs. In this Letter, we show rare examples of nMOFs grown in monocrystalline form around metal NCs. Specifically, Pt NCs were subjected to reactions yielding Zr(IV) nMOFs [Zr6O4(OH)4(fumarate)6, MOF-801; Zr6O4(OH)4(BDC)6 (BDC = 1,4-benzenedicarboxylate)
金属纳米晶体(NCs)周围的纳米晶体金属有机骨架(nMOF)的生长可用于控制金属NCs的化学性质和度量。在这封信中,我们展示了在金属NC周围以单晶形式生长的nMOF的罕见例子。具体地,使Pt NC进行反应,得到Zr(IV)nMOF [Zr 6 O 4(OH)4(富马酸酯)6,MOF-801;NbO 2-] 。Zr 6 O 4(OH)4(BDC)6(BDC = 1,4-苯二甲酸),UiO-66; Zr 6 O 4(OH)4(BPDC)6(BPDC = 4,4'-联苯二甲酸),UiO-67]作为嵌入Pt NC的单晶。发现这些构建体(Pt⊂nMOF)纳米晶体在甲基环戊烷(MCP)的气相加氢转化中具有活性,并具有非同寻常的产物选择性。Pt⊂nUiO-66显示出对C 6环烃(例如环己烷和苯)的选择性,该温度比标准反应(Pt- on -SiO 2)低100°C 。我们在nMOF系列中观察到孔径效应,其