Study Of The Preparation And Catalytic Oxidation Perormance Of The 3DOM Manganese Oxides

Volatile Organic Compound (VOC), as the environment hazards, has become a worldwide recognized, which has caused the serious impact on the health and security of ecosystems due to its high toxicity and hardly decomposing. Among various treating technologies, catalytic oxidation method has attracted great concern based on its slow energy consumption and broad scope application. Transitional manganese-based oxides are always the focus field for treating the VOCs due to their distinct cost advantage and good catalytic performance. However, such catalytic material will be marked by huge challenges for the rigor demands of the VOCs. Thus, the main subject of this wok is to design the microstructure of the manganese-based oxides and to enhance the catalytic performance ethyl acetate.The modulating of oxygen vacancies for the 3DOM MnOx was explored. The 3DOM MnOx were prepared via the double template method. The effects of calcination temperature and the treating conditions of the H2SO4 and H2O2 on the oxygen vacancies for the 3DOM MnOx were studied. The results indicated that the increasing of the calcination temperature is helpful not only to the transformation of crystalline phase from Mn2O3 to Mn3O4 but also to enhance the ratio of the Oads/Olatt.Moreover, the treating conditions of H2SO4 and H2O2 not only affect the crystal sizes and the reduction temperature of the MnOx but also are beneficial to enhancing the ratio of the Oads/Olatt. The catalytic performances show that the increased oxygen vacancies content is helpful to enhancing the catalytic oxidation performances for the ethyl acetate.The gelling velocity and the pore structure modulating of the 3DOM LaMnO3 were studied. To enhance the specific surface area of the 3DOM LaMnO3, the relativity between pore structures, chemical compose and the gelling velocity was investigated. The results indicate that the gelling velocity of the LaMnO3 with La and Mn two components can be decreased at a certain extent via introducing the mixed acid of tartaric and nitric acid. The gelling velocity of the LaMnO3 can be distinct decreased only by adding a minute amount of nitric acid, which is helpful not only to decreasing the size of the mesoporous but also to increasing the specific surface area of the 3DOM LaMnO3. The catalytic performances show that the decreased gelling velocity for the LaMnO3 is helpful to enhancing the catalytic oxidation performances for the ethyl acetate.The supported 3DOM LaMnO3 and their catalytic oxidation performances were studied. Based on the studding of the pore structure modulating of the 3DOM LaMnO3, the effects of the three types of noble metal constituents and four types of commonest metal constituents on the structures and the catalytic oxidation performances were studied. The results indicate that supported Pa on the LaMnO3 showed lower reduction temperature, higher the ratio of the Oads/Olatt and higher catalytic oxidation performances for the ethyl acetate than those of the LaMnO3 supported Au and Ag samples. Moreover, for the LaMnO3 supported Fe, Zn, Co and Cu metallic oxide samples, the supported Co oxide catalyst exhibited lower reduction temperature and higher the ratio of the Oads/Olatt than other three supported samples. The catalytic performances show that the supported Co oxide sample presented higher catalytic oxidation activity and stability for the ethyl acetate than other three supported catalysts.