期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 153, 期 1-2, 页码 103-108出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1381-1169(99)00307-6
关键词
niobium; peroxoniobate; epoxidation; oxidation; hydrogen peroxide
The sodium tetraperoxo niobate, Na-3[Nb(O-2)(4)] . 13H(2)O (1) was prepared by fusing Nb2O5 with NaOH followed by reacting with aqueous H2O2 and characterised by single-crystal X-ray analysis and TGA. 1 was tested for the epoxidation of cyclohexene and oxidation of alcohols with hydrogen peroxide as a homogeneous catalyst. The [Nb(O-2)(4)](3-) anion was found to catalyse the epoxidation of cyclohexene with 30% aqueous H2O2 in homogeneous solution giving cyclohexene oxide in a 73% selectivity and 7% cyclohexene conversion at 45 degrees C. It also showed some catalytic activity for the homogeneous oxidation of alcohols (ethanol, isopropanol, 1- and 2-butanol) with H2O2. The [Nb(O-2)(4)](3-) anion immobilised on a quaternary ammonium polystyrene resin was much less active in the above reactions than the homogeneous catalyst. (C) 2000 Elsevier Science B.V. All rights reserved.
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