期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 334, 期 2, 页码 176-182出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2009.02.046
关键词
Ni-B amorphous alloy; Hollow nanospheres; Emulsion system; Chloronitrobenzene; Hydrogenation; Chloroaniline
资金
- Leading Academic Discipline Project of SHNU [DZL807]
- National Natural Science Foundation of China [20603023]
- 863 Project [2007AA03Z339]
- 973 Program [2009CB2261606]
- Shanghai Government [09YZ158, S30406, 0852nm01000, 07dz22303]
Ni-B nanospheres were synthesized through chemical reduction of nickel ions with borohydride in an emulsion system comprised of cyclohexylamine, polyethylene glycol, and water. With the characterization of X-ray diffraction, selective area electronic diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy, the resulting hollow Ni-B nanospheres were identified to be amorphous alloys with a hollow chamber. Cyclohexylamine played a significant role in fabricating hollow Ni-B nanospheres, because only solid nanoparticles were obtained in the absence of cyclohexylamine. Polyethylene glycol also had a significant influence on the formation of hollow Ni-B nanospheres, because low yield of hollow nanospheres were achieved without this polymer. During liquid-phase chloronitrobenzene hydrogenation, the as-synthesized Ni-B catalyst exhibited a much higher activity and even better selectivity than the dense Ni-B nanoparticles prepared by direct reduction of nicked ions with borohydride. (C) 2009 Elsevier Inc. All rights reserved
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