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Selective Catalytic Performances of Noble Metal Nanoparticle@MOF Composites: The Concomitant Effect of Aperture Size and Structural Flexibility of MOF Matrices
Author(s) -
Chen Luning,
Zhan Wenwen,
Fang Huihuang,
Cao Zhenmin,
Yuan Chaofan,
Xie Zhaoxiong,
Kuang Qin,
Zheng Lansun
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702103
Subject(s) - catalysis , materials science , selectivity , noble metal , metal organic framework , composite number , nanoparticle , chemical engineering , nanotechnology , composite material , chemistry , organic chemistry , adsorption , engineering
Noble metal nanoparticles embedded in metal–organic frameworks (MOFs) are composite catalysts with enhanced or novel properties compared to the pristine counterparts. In recent years, to determine the role of MOFs during catalytic process, most studies have focussed on the confinement effect of MOFs, but ignored the structural flexibility of MOFs. In this study, we use two composite catalysts, Pt@ZIF‐8 [Zn(mIM) 2 , mIM=2‐methyl imidazole] with flexible structure and Pt@ZIF‐71 [Zn(DClIM) 2 , DClIM=4,5‐dichloroimidazole] with rigid structure, and hydrogenation of cinnamaldehyde as model reaction, to show the confinement effect and the structure flexibility of MOF matrices on the catalytic performance of composite catalysts. Both catalysts showed high selectivity for cinnamic alcohol with the confinement effect of the aperture. But, compared to Pt@ZIF‐71, Pt@ZIF‐8 exhibited higher conversion but lower selectivity owing to the flexible structure. The above results remind us that we will have to consider both the aperture size of MOFs and structure flexibility to select the proper MOF matrices for the composite materials to achieve the optimized performance.