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Controlled Pyrolysis of Ni‐MOF‐74 as a Promising Precursor for the Creation of Highly Active Ni Nanocatalysts in Size‐Selective Hydrogenation
Author(s) -
Nakatsuka Kazuki,
Yoshii Takeharu,
Kuwahara Yasutaka,
Mori Kohsuke,
Yamashita Hiromi
Publication year - 2018
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.201704341
Subject(s) - materials science , nanomaterial based catalyst , catalysis , chemical engineering , pyrolysis , metal organic framework , selectivity , x ray photoelectron spectroscopy , nanoparticle , thermal decomposition , decomposition , nickel , porosity , nanotechnology , organic chemistry , chemistry , metallurgy , composite material , adsorption , engineering
Metal organic frameworks (MOFs) are a class of porous organic‐inorganic crystalline materials that have attracted much attention as H 2 storage devices and catalytic supports. In this paper, the synthesis of highly‐dispersed Ni nanoparticles (NPs) for the hydrogenation of olefins was achieved by employing Ni‐MOF‐74 as a precursor. Investigations of the structural transformation of Ni species derived from Ni‐MOF‐74 during heat treatment were conducted. The transformation was monitored in detail by a combination of XRD, in situ XAFS, and XPS measurements. Ni NPs prepared from Ni‐MOF‐74 were easily reduced by the generation of reducing gases accompanied by the decomposition of Ni‐MOF‐74 structures during heat treatment at over 300 °C under N 2 flow. Ni‐MOF‐74‐300 exhibited the highest activity for the hydrogenation of 1‐octene due to efficient suppression of excess agglomerated Ni species during heat treatment. Moreover, Ni‐MOF‐74‐300 showed not only high activity for the hydrogenation of olefins but also high size‐selectivity because of the selective formation of Ni NPs covered by MOFs and the MOF‐derived carbonaceous layer.