期刊
NANO RESEARCH
卷 14, 期 1, 页码 59-65出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-3040-1
关键词
metallo-aerogels; nanocatalysts; nitroarenes; reduction; pyrolysis
类别
资金
- National Key R&D Program of China [2016YFA0202902]
- National Natural Science Foundation of China [21861132002, 21871059, 21572036]
- Department of Chemistry, Fudan University
Metallo-aerogels fabricated by pyrolysis of xerogels derived from chitosan-metal hydrogels exhibit excellent catalytic performance in hydrogenation reactions of nitroarenes. The superior catalytic properties are attributed to the graphitic shells formed during the pyrolysis process, which prevent aggregation of metal nanoparticles, leaching of metal, and increase their stability.
A series of robust metallo-aerogels are readily fabricated by pyrolysis of xerogels derived from chitosan-metal (M = Fe, Co, Ni) hydrogels. Owing to the strong coordination between metal ions and the functional groups (NH2 and OH) of chitosan, metallo-aerogels consisting of encapsulated metal-nanoparticles (MNPs) by graphite shells were obtained, as supported by various characterizations including high-resolution transmission electron microscope (HR-TEM), X-ray diffraction (XRD), and Raman. The resulting metallo-aerogels could be functioned as highly stable, efficient and selective nanocatalysts towards the hydrogenation of nitroarenes to amines at low catalyst loading (1.2 mol.%-2.4 mol.%). Remarkably, the metallo-aerogels could be reused for more than 30 runs without obvious loss of activity and selectivity. These distinguished performances were attributed to the graphitic shells formed during the pyrolysis, which hampered the possible aggregation of MNPs, prevented metal leaching and increased their stability.
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