Synthesis And Application Of Mesoporous Alumina

Mesoporous alumina has many applications in heterogeneous catalysis, adsorption and separation of macromolecules, optical, electrical, thermal and many other important fields as a catalyst, adsorbent, catalyst carrier. Although a large number of scholars have studied the preparation and characterization of mesoporous materials, most of them use the expensive organic materials such as aluminum source, which greatly increases the costs of industrialization. In order to get high properties but low production costs mesoporous alumina ,this paper has a systematic study of the preparation of mesoporous alumina, the impact of various factors on the synthesis and the application of seperation carbon dioxide. The structure of mesoporous alumina are also characterized and analyzed by variety of testing techniques such as BET, TEM, XRD and TGA / DTG.Mesoporous alumina are prepared with the aluminum nitrate as Al source, TEA and the lauric acid mixture as the structure directing agent, by precipitation and hydrothermal methods . The structure of mesoporous alumina as follows : surface area of 370m2/g, pore size of 4.0nm, pore volume 0.389cm3/g, pore size distribution of 2 ~ 6 nm. The factors of the reaction temperature, reaction time, inorganic aluminum species, different structure directing agent conditions are also discussed . And determined the optimal ratio of reactants, Al Source: TEA: lauric acid = 1:3:0.1 and synthesis of the optimum conditions: reaction temperature is 80℃, the crystallization time is 24 h and calcination temperature is 600℃. This method overcomes the synthesis of mesoporous alumina shortcomings of template expensive and lowers the costs.Mesoporous alumina as adsorbent , this paper implements dynamic experiments of the separation of carbon dioxide/nitrogen under different pressures at room temperature. The separation factor under different pressures shows that the greater the pressure, the smaller the separation factor .When the pressure is 0.2MPa, separation factor reaches the maximum about 6. This paper also studied that mesoporous alumina as carrier loads lead oxide by single molecular layer load method. The load has a great impact of properties adsorption of carbon dioxide. Experimental results show that the: after loading the adsorption equilibrium pressure is lower, but the adsorption capacity becomes more than before.