Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/10724
Title: Selective epoxidation of styrene with air over Co<sub>3</sub>O<sub>4</sub>-MO<sub>x</sub> and CoO<sub>x</sub>-MO<sub>x</sub>/SiO<sub>2</sub>
Authors: Lu, X-H
Lei, J
Zhou, D
Fang, S-Y
Dong, Y-L
Xia, Q-H
Keywords: Catalysis
Epoxidation
Oxidation
Air oxidation
Composites
Oxides
Cobalt oxide
Styrene
Issue Date: Dec-2010
Publisher: NISCAIR-CSIR, India
Series/Report no.: Int. Cl.<sup>9</sup> B01J23/00
Abstract: Composite Co<sub>3</sub>O<sub>4</sub>-MO<sub>x</sub> metal oxides prepared by direct calcination are found to be considerably active for the epoxidation of styrene with air in DMF under mild conditions. A substrate conversion of 86.6 mol% with an epoxide selectivity of 79.4% is achieved at 373 K over 15 mg of 10:1 Co<sub>3</sub>O<sub>4</sub>-SnO<sub>x</sub> oxide catalyst, and is superior to other Co<sub>3</sub>O<sub>4</sub>-MO<sub>x</sub> catalysts.<b style=""> </b>After Co<sub>3</sub>O<sub>4</sub>-MO<sub>x</sub> was loaded on the supports like SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, MgO or zeolite Y through a simple procedure consisting of wet impregnation/ion exchange, drying and calcination, only 3%Co<sub>3</sub>O<sub>4</sub>-1%TiO<sub>2</sub>/SiO<sub>2</sub> behaves as a high-efficiency catalyst. Under identical conditions, 3%Co<sub>3</sub>O<sub>4</sub>-1%TiO<sub>2</sub>/SiO<sub>2</sub> catalyzed 76.7 mol% of the styrene conversion with 80.6% selectivity to epoxide, higher than other catalysts. The results showed that many factors affected the performance of the catalysts, such as the molar ratios of Co<sub>3</sub>O<sub>4 </sub>to MO<sub>x</sub>, the loading of cobalt or other metals, the support, the catalyst amount, etc.
Description: 1586-1592
URI: http://hdl.handle.net/123456789/10724
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.49A(12) [December 2010]

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