MA Guo-fu, ZHANG Zhi-fang, PENG Hui, ZHANG Zhe, WANG Qi-zhao, LEI Zi-qiang *
(Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China)
Abstract: Tubular gamma alumina was prepared by sol-gel method using cotton as template and aluminium chloride as aluminum resource. Via chemical tailoring method, gamma alumina supported aluminum bromidewas obtained. Several techniques such as high-resolution field-emission scanning electron microscopy, N2 adsorption techniques and X-ray diffraction were employed to investigate their morphology, structures as well as components. Experiments showed, via template synthesis, the gamma alumina fibers well replicated the nanoporous morphologies and hierarchical pore size of original cotton. With different concentration of hydrobromic acid, the morphology, structure and component could be controllablly changed. These preparation methods made these catalysts exhibited unique characteristics, such as environmental friendship, low cost and non-toxicity. The Baeyer-Villiger oxidation reactions of ketones catalyzed by the gamma alumina supported aluminum bromide, together with 30% hydrogen peroxide as an oxidant, were carried out. The experimental results revealed that this type of reactions could proceed in ethylacetate at 70℃ with good yields and high regioselectivity, through an example of oxidized cyclohexanone.
Key words: Cotton;Template synthesis; Chemical tailoring; Baeyer-Villiger oxidation
E-mail: leizq@nwnu.edu.cn
Journal of Molecular Catalysis, Vol. 25, Issue 3, 2011, 193~201
