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Synthesis of mesoporous alumina with CO2 expanded carbonation and its catalytic oxidation of cyclohexanone |
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| Affiliation: | 1. Department of Civil, Environmental and Architectural Engineering, University of Genova, Italy;2. NatHaz Modeling Laboratory, University of Notre Dame, IN, USA;1. School of Chemical and Petroleum Engineering, Shiraz University, Mollasadra Ave., Shiraz 71345, Iran;2. Delft University of Technology, Faculty of Science and Technology, Department of Chemical Technology, Julianalaan 136, 2628 BL Delft, The Netherlands;3. The Petroleum Institute, Chemical Engineering Department, P.O. Box 2533, Abu Dhabi, United Arab Emirates;4. Eindhoven University of Technology, Department of Chemical Engineering and Chemistry, Separation Technology Group, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands;1. Department of Physics, Harbin Institute of Technology, Harbin 150001, People’s Republic of China;2. Aerospace Research Institute of Special Materials and Processing Technology, Beijing 100074, People’s Republic of China |
| Abstract: | A CO2 expanded carbonation technique is proposed for direct synthesis of alumina powders that does not require structure directing substances or templates. Mesoporous amorphous flower-like alumina was synthesized at relatively low volume expansions (lower ethanol to water volume ratio), whereas mesoporous crystalline honey-comb-like alumina was synthesized at high volume expansions. The alumina powders exhibited high surface area and pore size with small crystallite sizes. The alumina structures were stable from 400 to 800 °C. Experimental tests showed that the alumina powders could catalytically convert cyclohexanone to ɛ-caprolactone efficiently. The use of the calcined catalysts (at 400 and 800 °C; flower-like alumina) at equal ethanol to water volume ratio avoids the usual and inevitable hydrolysis of ɛ-caprolactone to ɛ-hydroxyhexanoic acid. The catalyst was recyclable and stable for up to five reaction cycles. |
| Keywords: | Alumina Carbon dioxide expanded carbonation Honey-comb-like Baeyer–Villiger oxidation Cyclohexanone |
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