材料科学
纳米材料基催化剂
催化作用
化学工程
热解
金属有机骨架
选择性
X射线光电子能谱
纳米颗粒
热分解
分解
镍
多孔性
纳米技术
有机化学
化学
冶金
复合材料
吸附
工程类
作者
Kazuki Nakatsuka,Takeharu Yoshii,Yasutaka Kuwahara,Kohsuke Mori,Hiromi Yamashita
标识
DOI:10.1002/chem.201704341
摘要
Abstract 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.
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