| 초록 |
Co2O4 hollow microspheres with porous crystalline structure were one pot formulated by hydrothermal treatment of Chitosan/Urea/ Co(NO3)2 mixtures at 180 °C for 12 h and then calcined at different temperatures for 4 h. The prepared materials were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and BET technique. The catalytic activity of the as-prepared sample was examined for hydrolysis reaction of sodium borohydride (NaBH4) at different temperature, catalyst amount and (NaBH4) amount. The results reveal that the average crystallite size, microsphere thickness, surface properties and catalytic activity of Co2O4 hollow microspheres could be controlled by varying the molar ratio of chitosan/urea to cobalt concentration. Further results indicate that hollow microspheres can be separated from the reaction mixture by simple filtration or centrifugation after catalytic reaction and reused for several runs. |
