| Autor: |
Lahcene, Driss, Choukchou-Braham, Abderrahim, Kappenstein, Charles, Pirault-Roy, Laurence |
| Zdroj: |
Journal of Sol-Gel Science & Technology; Dec2012, Vol. 64 Issue 3, p637-642, 6p |
| Abstrakt: |
The system of VO-TiO catalysts with VO contents from 5 to 20 wt% were prepared by the sol-gel route and calcined at 500 °C. The mixed oxide series presented the crystalline structure of TiO anatase phase. BET analysis showed a medium surface area decreasing from 73 to 19 m g when VO content rose from 5 to 20 wt%. The results of pyridine adsorption followed by FT-IR indicate that the catalysts display identical surface acid densities, independently of the VO content, and both Brønsted and Lewis acid sites are present on their surfaces. The VO system presents an activity and selectivity during the cyclohexene oxidation reaction. The presence of VO increases the catalyst efficiency and leads to a selectivity change from cyclohexenol (blank test) to epoxide, with a maximum for 15 wt% VO. The conversion of cyclohexene was 46 % while the selectivity to epoxide was higher (75 %). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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