期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 54, 页码 14418-14424出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201801942
关键词
alloys; copper; heterogeneous catalysis; hydrogenation; iron; magnetic immobilization
资金
- Ministry of Science and Technology [2017YFC0906902, 2017ZX09301032]
- National Natural Science Foundation of China [21621003]
- Macau Science and Technology Development Fund [129/2017/A3, 089/2013/A3]
- Fundamental Research Funds for the Central Universities [N160504002]
A novel core-shell structured nanocatalyst (Fe3O4@SiO2-NH2-FeCu nanoparticles) with ultrafine FeCu alloy NPs magnetically immobilized in porous silica has been fabricated. The obtained catalyst revealed excellent activity and chemoselectivity for catalyzing the hydrogenation of nitroarenes to corresponding anilines using hydrazine hydrate as the hydrogen source, and the reaction could be carried out smoothly in water, which is an environmentally friendly solvent. The FeCu alloy effectively prevented the dehalogenation of halonitroarenes, and X-ray photoelectron spectroscopy (XPS) study showed that it resulted from the electron-enrichment of Fe from Cu. A kinetics study indicated that the reaction order was about 1.5 towards 4-CNB and the apparent active energy (E-a) was 48.1 kJ mol(-1), which is a relatively low value. Furthermore, the FeCu NPs are magnetically immobilized in the silica spheres (Fe3O4@SiO2), therefore the catalyst can be easily recovered by use of an external magnet and also possesses a long life time.
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