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Title: Epoxidation of mixed bi-olefins with air over nanosized Co3O4 assisted by ultrasonic waves
Authors: Lei, J
Lu, X-H
Zhang, J-L
Wei, X-L
Zhou, D
Xia, Q-H
Keywords: Epoxidation;Hydrocarbons;Olefins;Biolefins;Epoxides;Mixed alkenes;Nanomaterials;Cobalt oxide
Issue Date: 5-Jun-2013
Abstract: Nanosized Co3O4 prepared by a simple method is considerably active in the ultrasonic waves assisted epoxidation of mixed bi-olefins with dry air. Both conversions and selectivities are distinctly promoted with α-methylstyrene and α-pinene mixed in the molar ratio of 1:1, as compared to α-methylstyrene or to α-pinene alone. When other alkenes are mixed with cyclooctene at 1:5 (molar ratio), different effects are observed. The mixture of styrene and cyclooctene shows almost the same increase in activity as the mixture of α-methylstyrene and α-pinene. While isophorone could assist the epoxidation of cyclooctene, by itself it could not be oxidized by molecular oxygen under the present conditions. When indene is mixed with cyclooctene, its conversion increases; however, the reactivity of cyclooctene decreases notably. UV-vis spectral analysis shows that these observations may be due to the intermolecular electron transfer which is very important for the enhancement of reactivities of bi-olefinic molecules.
Page(s): 709-716
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.52A(06) [June 2013]

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