Bakuru Vasudeva Rao, Kalidindi Suresh Babu
Materials science division, Poornaprajna Institute of Scientific Research, Bidalur post, Devanahalli, Bengaluru, 562164, India.
Graduate Studies, Manipal University, Manipal-, 576104, India.
Chemistry. 2017 Nov 21;23(65):16456-16459. doi: 10.1002/chem.201704119. Epub 2017 Oct 30.
Enhancing catalytic performance of metal nanoparticles is highly sought for many industrial catalytic processes. In this regard, assembly of crystalline porous super-tunable metal-organic frameworks (MOFs) around preformed metal nanoparticles is an attractive prospect as this strongly influences the activity of the entire nanoparticle surface. Herein, we assembled a MlL-101(Fe) MOF onto the Pd nanocubes and evaluated the catalytic properties of the hybrid material for the hydrogenation of the α,β-unsaturated carbonyl compounds cinnamaldehyde, crotonaldehyde, and β-ionone. Owing to the synergestic effects originating from the Lewis acid sites present on MOF and Pd active sites, striking improvements in the activities and selectivities were observed for the Pd⊂MIL-101(Fe) hybrid material. The turnover frequency (TOF) values increased up to roughly 20 fold and in all three studied substrates, C=C was preferentially hydrogenated compared to C=O. Furthermore, the Pd⊂MIL-101(Fe) catalyst was readily reusable and highly stable.
提高金属纳米颗粒的催化性能在许多工业催化过程中备受关注。在这方面，围绕预制金属纳米颗粒组装结晶多孔超可调金属有机框架（MOF）是一个有吸引力的前景，因为这会强烈影响整个纳米颗粒表面的活性。在此，我们将MlL-101(Fe) MOF组装到钯纳米立方体上，并评估了该杂化材料对α,β-不饱和羰基化合物肉桂醛、巴豆醛和β-紫罗兰酮氢化反应的催化性能。由于MOF上的路易斯酸位点和钯活性位点产生的协同效应，Pd⊂MIL-101(Fe)杂化材料的活性和选择性有显著提高。周转频率（TOF）值增加了约20倍，并且在所有三种研究的底物中，与C=O相比，C=C优先被氢化。此外，Pd⊂MIL-101(Fe)催化剂易于重复使用且高度稳定。
