The Preparation And Properties Investigation Of Metal Oxide Nanomatenals

In recent years, through the untiring efforts of the scientists, they found that take advantage of new technology and new methods could make the harmonious development betweet people and the environment. The development of nanotechnology marks people enter into a new stage of utilizing nature and change nature. Due to their special particle size, nanomaterials are very special materials.In the numerous nanomaterials, metal oxide nanomatenals is a very special material and widely used in catalyst, composite, fluorescent material, ceramic and semiconductor and so on. Energetic material has a very high energy density and be widely used in the national defense and economic construction of our country. Thermite as a kind of high qualitydensity, high energy density and high safety performance energetic materials has been attracting many attentions of scientists. Porous materialsare an important branch of material science. Tetravalent metal oxide is one of the important research areas, for instance ZrO2, CeO2, TiO2, ZrO2 is in the form of white powder or monoclinic crystal, the molecular weight is 123. ZrO2 has three crytal forms, monoclinic, tetragonal and cubic phase, and it is a polycrystalline oxide. ZrO2 is widely used in ceramics, electronics, optics, biology, machinery, aerospaceand chemical, and ZrO2 has been attracting many attentions of scientists. Its application in the field of catalytic recognised by many scientists, ZrO2 has high thermal stability and high chemical stability. Above all, it's a kind of acidic and alkaline metal oxides with oxidizing and reducing. Its acid sites derive from the dangling bond that lattice fracture of the Zr4+ in the surface. With the existence of the dangling bond, When the alkali molecules are approached ZrO2 could give priority in proton so that show the acidic. Its basic sites derive from the dangling bond that lattice fracture of the O2- in the surface. So it can accept protons and show the alkaline.This paper aims at the problems about conditional thermite high-cost, lower calorific value and so on. We studied the design, preparation and property research of the core-shell structure Al@metallic oxide nanocomposite in order to present a new method of preparation of the Al@metallic oxide nanocomposite. Nanoscale Al was used as aluminum source and using the unique reduction-oxidation route aiming to achieve a variety of metal oxides coated on the surface of the Al nucleus. Finally we prepare a series of core-shell structure materials aim to the accuracy control of composition, particle size distribution, the quality of the aluminum core and metal oxide shell of the nanocomposite. We can present a new method of the design and synthesisof theAl@metallic oxide nanocomposite.We aim at the problems about conditional ZrO2 high-cost, complex preparation and so on. We present a new method of hydrothermal synthesis of dynamic controlled. It's a direct one-step method to synthesis of required tetravalent metal oxide using sodium borohydride (NaBH4) as a precipitating agent and without any surfactant or template want is more does not need high-temperature calcination. And we take the nanocomposite as the research objectanalyse the structure of the nanocomposite by XRD and Raman. And we use NH3-TPD and CO2-TPD to analyse the roles of acid sites and basic sites in the reaction of MPV, Finally we study the influence of reaction time, reaction pressure and concentration of substrate to the reaction of MPV.