期刊
APPLIED CATALYSIS A-GENERAL
卷 454, 期 -, 页码 88-92出版社
ELSEVIER
DOI: 10.1016/j.apcata.2013.01.007
关键词
Niobium oxyhydroxide; Hydrogen peroxide; Cyclohexene; Epoxide
资金
- CNPq
- CBMM (Brazil)
- FAPEMIG
A surface modified niobium oxyhydroxide catalyst was utilized for the selective liquid-phase oxidation of cyclohexene to epoxide in the presence of hydrogen peroxide. After surface modification with a surfactant (cetiltrimetilamonium bromide-CTAB), the very active niobium oxyhydroxide (NbO2OH), presented hydrophobic characteristics and good activity for the oxidation of cyclohexene over the heterogeneous catalyst. Furthermore, the hydrophobic material presented a high selectivity toward the formation of the epoxide species. The mass spectrometry analysis of the reaction showed that epoxide species was produced with a selectivity of 60% using 0.2 mL of hydrogen peroxide, with 65% of conversion. The results strongly suggest that the reaction involves oxidizing species generated after the reaction with H2O2. The surfactant anchored over the niobium catalyst promotes a better interaction with the nonpolar substrate. (C) 2013 Elsevier B.V. All rights reserved.
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