The Modification And Application Research Of The Titanate Materials

Para-nitrotoluene is a kind of important fine chemical intermediates which is prepared by toluene nitration and it has many applications in the medical and industrial fields. In the industrial production, the toluene was nitrated mostly through using the mixed acid (sulfuric acid and nitric acid) catalysis process, however in this process, lots of problems such as more by-products, low yield of paranitrotoluene and serious environmental pollution were appeared. In this paper, the layered K2Ti4O9crystalline powder was synthesis by high-temperature solid state method and the H2Ti4O9, TiO2-H2Ti4O9, SO42-/TiO2-H2Ti4O9solid acids have been prepared by acidification, pillared and acid dipping method. The structure, morphology and the acidity of catalyst were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and multi-adsorption instrument (NH3-TPD). The performance of the selective nitration of the toluene of the modified layered titanate was evaluated by using nitration of toluene as the probe. The results showed that the prepared solid acid H2Ti4O9, TiO2-H2Ti4O9, SO42-/TiO2-H2Ti4O9have better selectivity on the nitration of toluene than the liquid mixed acid, which is due to the strong acidity of the solid acid catalysts and the selective type effects. The catalyst has a strong acid peak after impregnated in the sulfuric acid. The ratio of p-nitrotoluene to o-nitrotoluene of SO42-/TiO2-H2Ti4O9catalyzed the nitration of toluene to be maximized, which represents the SO42-/TiO2-H2Ti4O9has the better catalytic selectivity.It is of great significance to protect the humans’environment by reduce the content of sulfur compound. Photocatalytic oxidation desulfurization can be used under the sunlight and it can largely remove the sulfur. This technology has attracted the attention all over the world. In my study, titanate nanotubes were prepared by hydrothermal method, and then modified by Ni2+and Fe3+to fabricate the Ni-TNT and Fe-TNT, respectively. Many methods are used to characterize the samples, such as XRD, FT-IR and UV-vis DRS, etc. The photocatalytic activity of modified titanate nanotubes was evaluated by using photocatalytic oxidation of ethyl mercaptan as probe. The results indicate that the pure Na-TNT has little photocatalytic activity, the photocatalytic activity of Ni-TNT and Fe-TNT is better than Na-TNT, and the Fe-TNT exist the highest activity. And the band gap decline to improve the solar energy utilization due to the absorption edge of modified samples red shift.