Synthesis Of Highly Ordered Mesoporous Materials As Supports By EISA Method For The SCR And CO Oxidation

With the rapid economical and social development, the environmental pollution has been a serious problem. As NOx is the main component of automobile exhaust, people focus on how to control and deal with it. Selective Catalytic Reduction (SCR) is one of the main means of dealing with NOx. CO is another main pollutants in the atmosphere produced from the combustion. It is very meaningful and necessary to find a effective way to deal with the pollutants such as NOx and CO, and catalysts play a crucial role both in SCR and CO oxidation.With the special properties, non-silicon based mesoporous materials have wide range of applications. Non-silicon based mesoporous materials usually have a high specific surface area and regular pore structure, they could be good supports of catalysts, and improve the adsorption capacity and enhance the interaction between the active component and the supports.Evaporation-Induced Self-Assembly (EISA) is one the the soft template method to prepare mesoporous materials, it is simple and materials prepared through this method always have a ordered pore structure. In this paper, we firstly prepared a series of non-silicon based mesoporous oxides, and each of them had a high surface area and regular pore structure. The mesoporous titanium oxides was chosen to be further studied. Different kinds of titanium oxides were prepared by EISA method, common sol-gel method, hydrothermal method, hard-template method and ceramic method. After loading vanadium species and manganese species on the titanium oxides, the V/TiO2and Mn/TiO2catalysts were used in the SCR and CO oxidation.After a series of characterization and activity test, we got the conclusion:catalysts with the support of EISA-TiO2had the best performance. In the SCR reaction, V/EISA and Mn/EISA were both better than other catalysts respectively. NO conversion could be achieved100%between280℃to350℃using the V/EISA catalysts, while it also could be100%between150℃to250℃with the lowest by-products using the Mn/EISA catalysts. In the CO oxidation reaction, Mn/EISA also was the best one, CO conversion rate could reach100%at270℃. This is mainly due to the long-range ordered structure and high specific surface area of mesoporous titanium oxides, which is beneficial to the dispersion and better performance of the active ingredient. Affected by the supports, performance of the catalysts in this order:ordered mesoporous supports>disordered mesoporous supports> non-mesoporous supports.