Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 5, Issue 5, Pages 1178-1184Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.200900628
Keywords
heterogeneous catalysis; hydrogenation; ionic liquids; nanoparticles; nickel
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Funding
- National Natural Science Foundation of China [20773037]
- ECUST [YJ0142136]
- Commission of Science and Technology of Shanghai Municipality, China [07J14023]
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Nickel nanoparticles (NPs) well-dispersed in the aqueous phase were conveniently prepared by reducing nickel(II) salt with hydrazine in the presence of the functionalized ionic liquid 1-(3-aminopropyl)-2,3-dimethylimidazolium bromide. UV/Vis spectroscopy, elemental analysis, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS) show the presence of a weak interaction of the functionalized ionic liquid with Ni-II and Ni-0 complexes. The face-centered cubic structure of the Ni-0 NPs was confirmed by X-ray diffraction (XRD) characterization. Transmission electron microscopy (TEM) images reveal that smaller Ni-0 particles of approximately 6-7 nm average diameter assemble to give larger, blackberry-shaped particles with an average diameter of around 35 nm. The Ni NPs were employed as highly efficient catalysts for the selective hydrogenation of C=C double bonds in the aqueous phase under mild reaction conditions (40-90 degrees C at 1.0-3.0 MPa), and the Ni-0 nanocatalysts in the aqueous phase are stable enough to be reused at least seven times without significant loss of catalytic activity during subsequent reuse cycles.
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