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以脱脂棉为模板制备了多孔管状结构的Al2O3材料,用不同浓度的氢溴酸对多孔管状结构的Al2O3材料进行化学剪裁,制备了活性量可控,比表面积可调,不同形貌的负载型催化剂Al2O3-AlBr x。采用电场发射扫描电镜(SEM)和X射线衍射仪(XRD)对催化剂进行了表征。结果表明,该催化剂较好地复制了棉纤维的宏观和微观结构,呈现出明显的生物形貌特征。在光照条件下以空气为氧化剂的醇的选择性氧化反应中,发现催化剂Al2O3-AlBr x-3可以高选择性地将醇氧化为相应的醛、酮或酸,并对反应机理进行了探讨。该催化剂循环使用3次仍保持较高的催化活性。
A porous tubular structure of Al 2 O 3 was prepared by using cotton wool as a template. The porous tubular Al 2 O 3 material was chemically tailored with different concentrations of hydrobromic acid to prepare a supported catalyst with controlled activity, adjustable specific surface area and different morphologies Al2O3-AlBr x. The catalysts were characterized by electric field emission scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the catalyst can well reproduce the macroscopic and microstructure of cotton fiber and show obvious biological topography. In the selective oxidation of alcohols with air as oxidant under light irradiation, it was found that the catalyst Al 2 O 3 -AlBr x-3 can be oxidized to the corresponding aldehydes, ketones or acids with high selectivity and the reaction mechanism was also discussed. The catalyst was recycled for 3 times to maintain a high catalytic activity.