The Study On The Preparation And The Catalytic Property Of CuO Ultrafine Material

Using Copper (II) sulfate pentahydrate as the main raw material, CuO submicrorods andCuO-Cu2O composite hollow spheres have been prepared via rapid liquid phase precipitationmethod and hydrothermal method respectly. The particle size, morphology and crystalstructure of the samples were characterized by Malvern Zetasizer, X-ray diffraction (XRD),Fourier Transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) andThermogravimetric Ananlysis (TG). The formation processes of submicrorods and hollowspheres have been discussed briefly. In addition, based on catalytic decomposition ofhydrogen peroxide as the model reaction, and the synthetic powder material as catalysts, theeffects of various catalysts and catalytic reaction conditions on catalytic decomposition ratewere researched in alkaline medium, the secondary order of these influencing factors wassummarized as well. The results show:(1)The optimum process conditions of preparation of CuO submicrorods via rapid liquidphase precipitation method are as follows: the amout of SDS is3Wt.%, reaction time is30min, nantokite concentration is0.7mol/L, the molar ratio of copper salt and precipitant is1:2.2, calcination temperature is500℃, calcination time is2h. The CuO submicrorods haveregular morphology, good dispersion and uniform particle size.(2)The optimum process conditions of preparation of CuO-Cu2O composite hollowspheres via hydrothermal method are as follows: hydrothermal time is16h, the ratio ofcupper and carbon (Cu/C6, molar ratio) is1:5, the nantokite concentration is0.25mol/L,calcination temperature is500℃. The synthetic CuO-Cu2O composite hollow spheres haveintact structure, smooth surface, compact shell and relatively uniform outer diameter.(3)The experiment of catalytic performance of superfine powder material shows:CuO-Cu2O has the highest catalytic decompositon rate of H2O2over all the samplesinvestigated; the secondary order of the influencing factors on catalytic decompositon rate ofH2O2are as follows: catalyst species, reaction temperature, medium concentration,catalystdosage, the concentration of H2O2.