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首页> 外文期刊>Nano letters >Ligand-Functionalization-Controlled Activity of Metal-Organic Framework-Encapsulated Pt Nanocatalyst toward Activation of Water
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Ligand-Functionalization-Controlled Activity of Metal-Organic Framework-Encapsulated Pt Nanocatalyst toward Activation of Water

机译：金属 - 有机骨架 - 包封PT纳米催化剂朝向激活水的配体 - 官能化控制活性

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摘要

We first report the systematic control of the reactivity of H2O vapor in metal-organic frameworks (MOFs) with Pt nanocrystals (NCs) through ligand functionalization. We successfully synthesized Pt NCs covered with a water-stable MOF, UiO-66 (Pt@UiO-66), having different metal ions or functionalized ligands. The ligand functionalization of UiO-66 significantly affected the catalytic performance of the water-gas shift reaction, and the replacement of Zr4+ ions with Hf4+ ions in UiO-66 had no impact on the catalytic activity. The introduction of a -Br group lowered the reactivity of Pt@UiO-66 by nearly half, whereas the substitution of -Br with a -Me-2 group triply enhanced the activity. The origin of the enhanced catalytic activity was found to be the change in H2O activity in the UiO-66 pores by the ligand functionalization, which was investigated using H2O sorption, solid-state NMR, X-ray photoelectron spectroscopy, and in situ IR measurements. This work opens a new prospect to develop MOFs as a platform to activate H2O.
机译：我们首先报告H2O蒸气的有Pt纳米晶体（NCS）通过配体官能化的金属 - 有机骨架（MOF）的反应性的系统的控制。我们成功地合成了Pt的NC覆盖有水稳定的MOF，UIO-66（铂@ UIO-66）中，具有不同的金属离子或官能配体。 UIO-66的配体官能化显著影响了水煤气变换反应的催化性能，并在UIO-66替换Zr 4+的离子与HF4 +离子对的催化活性没有任何影响。引入-Br组的近一半降低了Pt的@ UIO-66的反应性，而-Br的与-Me-2基团的取代三重增强的活性。增强的催化活性的起源被发现是在H 2 O的活性的变化UIO-66孔通过配体官能化，其使用H 2 O的吸附，固态NMR，X射线光电子能谱法和原位IR测量调查。这项工作开辟了新的前景，开发MOFs材料为平台，以激活H2O。

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