Takovite鈥揂luminosilicate鈥揅r Materials Prepared by Adsorption of Cr3+ from Industrial Effluents As Catalysts for Hydrocarbon Oxidation Reactions
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- 作者：Katia J. Ciuffi ; Emerson H. de Faria ; Liziane Mar莽al ; Lucas A. Rocha ; Paulo S. Calefi ; Eduardo J. Nassar ; Iuri Pepe ; Z锚nis N. da Rocha ; Miguel A. Vicente ; Raquel Trujillano ; Antonio Gil ; Sophia A. Korili
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：May 23, 2012
- 年：2012
- 卷：4
- 期：5
- 页码：2525-2533
- 全文大小：406K
- 年卷期：v.4,no.5(May 23, 2012)
- ISSN：1944-8252
文摘
The catalytic efficiency of takovite鈥揳luminosilicate鈥揷hromium catalysts obtained by adsorption of Cr3+ ions from aqueous solutions by a takovite鈥揳luminosilicate nanocomposite adsorbent is reported. The adsorbent was synthesized by the coprecipitation method. The catalytic activity of the final Cr鈥揷atalysts depended on the amount of adsorbed chromium. (Z)-cyclooctene conversion up to 90% with total selectivity for the epoxide was achieved when the oxidation was carried out with hydrogen peroxide, at room temperature. After five consecutive runs, the catalysts maintained high activity, although after the sixth reuse, the epoxide yields strongly decreased to 35%. The catalysts were also efficient for cyclohexane oxidation, reaching up to 18% conversion, with cyclohexanone/cyclohexanol selectivity close to 1.2. On the whole, their use as catalysts gives a very interesting application for the solids obtained by adsorption of a contaminant cation such as Cr3+.