期刊
CHEMCATCHEM
卷 8, 期 5, 页码 946-951出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201501256
关键词
heterogeneous catalysis; hydrogenation; metal-organic frameworks; nanoparticles; platinum
资金
- National Natural Science Foundation of China [21322606, 21436005, 21406075, 21576095]
- Fundamental Research Funds for the Central Universities [2014ZB0004, 2015ZP002, 2015PT004]
- Guangdong Natural Science Foundation [2013B090500027]
- China Postdoctoral Science Foundation [2014M550437, 2015T80908]
The encapsulation of metal nanoparticles (MNPs) within metal-organic frameworks (MOFs) to form core-shell structural nanocomposites is one of the most promising methods to enhance the durability and selectivity of MOF-supported metal catalysts. However, it is still a challenge to fully encapsulate tiny MNPs inside MOFs. Herein, we report a facile and general strategy to coat MOFs on the surface of Pt/MOFs by direct homoepitaxial growth. The obtained Pt/MOFs@MOFs nanocomposites retained the intrinsic properties (e.g., crystalline structure, pore texture, and surface area) of Pt/MOFs. Strikingly, the MOF-coated materials exhibited a significantly enhanced chemoselectivity compared to the uncoated materials, for example, in the hydrogenation of cinnamaldehyde, the selectivity to cinnamyl alcohol through C=O hydrogenation was improved from 55 to 96% at complete conversions of cinnamaldehyde. Moreover, Pt/MOFs@MOFs can be recycled without any remarkable loss in both activity and selectivity. The enhanced catalytic selectivity and stability of MNPs/MOFs could be related to the synergetic effects of the electron donation and nanoconfinement offered by the surrounding MOF networks.
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