|
With the rapid development of modern society, energy and environmental issues are becoming more prominent. In order to solve the energy and environmental crisis, the rapid development of nanotechnology provides endless opportunities and broad prospects. Makes it excellent properties of the manganese oxide in catalysis, adsorption, ion exchange, communications, microwave ferrite, soft ferrite, gas sensing, humidity and many other fields have a wide range of applications. International research preparation methods and structure of manganese oxide deficiencies, for example, is still facing great challenges in the preparation of large surface area, high thermal stability and structural morphology and size of the controlled oxidation of manganese, while oxidation manganese functions (optical, electrical, catalytic and adsorption properties, etc.) need to be further exploration and development. For these existing problems, this paper carried out the following sections: (1) the the ammonia evaporation-induced the hydrolysis prepared Mn2O3/SBA-15 catalyst using ammonia evaporation induced hydrolysis processing method to prepare high load Mn2O3/SBA- 15 catalyst, the catalyst having a high specific surface area, degree of order, and Mn2O3 coated particles are uniformly attached to the pore walls of the SBA-15, has a higher degree of dispersion, and no pore blockage. This is mainly attributed to the role of the ammonia vapor, the pores of the manganese precursor hydrolysis MnOOH, and ammonia vapor under pressure, MnOOH evenly cover the pore walls of the SBA-15. Of catalyst in the oxidative degradation of the performance of the high concentration of methylene blue and ethanol, the results showed that, 50% Mn2O3/SBA-15 has the best catalytic activity, its catalytic performance is improved as the temperature increases, the decrease in pH. (2) a KMnO4 carbon monoxide prepared structure controllable MnOx (1 ≦ x ≦ 2) in the low temperature conditions, using KMnO4 carbon Birnessite-type MnO2 structure controllable layered structure was prepared and 2 × 2 tunnel structure MnO2. Investigated the reaction temperature, time, pH of the solution, and reactant concentration on the structure of the product, through the X-ray diffraction, field emission scanning electric mirrors and perspective electric mirrors and other testing means, the product crystal form, and structure carried out the analysis and characterization, and exploration carried out on the of MnO2 formation and growth mechanism. Meanwhile, the core-shell MnO2 as precursors prepared by low temperature reduction core-shell of Mn2O3, Mn3O4 and MnO. Core-shell the MnO2 and core-shell the Mn2O3 catalytic, electrochemical properties and adsorption performance testing results show that the core-shell structure of MnO2 with core-shell structure Mn2O3 not only has good catalytic performance, simultaneously the MnO2 exhibit excellent capacitance rather the core-shell structure the Mn2O3 you have good adsorption performance. (3) Low temperature synthesis of new LiMn2O4 material as precursors to the above-prepared MnO2 with LiOH · 4H2O mixed in nitrogen and air, respectively 400oC processing structure controllable LiMn2O4 material was prepared by XRD, FESEM test means the crystalline form of the product as well as structural analysis and characterization.
|