Synthesis And Application Of Titanium Silicalite And Porous Material

With China’s growth of energy consumption, atmospheric environmental issues become more prominent, environmental and energy issues have become a problem in front of us. Nitrogen oxides are one of the main cause of acid rain, the selective catalytic reduction of nitrogen oxides has been a great concern for the protection of the atmosphere in the industrial and scientific fields. In dealing with the issue of nitrogen oxides selection of SCR catalyst is particularly important. In this context, we studied the novel titanium catalyst and porous material, whether it has a good performance for the application of denitrification.At first, this paper studied denitration performance of the silicon titanium catalyst TS-1, ETS-4 and ETS-10 by hydro-thermal synthesis. Two Modifiers modified molecular sieve with the ion exchange method and the ion doping method, loaded with different percentages of Cu and directly doped Al, Fe, Ce, plasma ions in the synthesis step, we discuss the NH3-SCR performance, then we conducted a comprehensive analysis by the means of XRD, BET, SEM, XPS, XPF, and explain its relationship with NH3-SCR activity. Then we prepare TiCeOx porous material with homogeneous precipitation method. It was studied NH3-SCR activity of V2O5 loaded and no-loaded sample, and the results were analyzed by series means of SEM, XRD, NH3-TPD.Experiments show that the new titanium silicalite has a particularly rich pore structure and large specific surface area, the NH3-SCR denitration performance has a good performance, and significantly better than the conventional TS-1 titanium silicalite.NO conversion rate can be close to the maximum 100% and its selectivity are greater than 90% N2 over Cu/ETS-4 and Cu/ETS-10. In the comparison of themselves, having [TiO6]2- octahedral structure of the ETS-10 has better acidic adsorption and ion exchange capacity. It can maintain excellent denitration performance within 200℃-400℃ temperature window. Characterization results can be seen divalent Cu2+ species is the crucial role in NH3-SCR. Al doping elements can enhance the activity of molecular sieve ETS-4 of low-temperature doping Ce element of ETS-10 improves the NO conversion rate of the high temperature section. TiCeOx porous material loading V2O5 have a good performance in NH3-SCR, NO conversion rate can be close to 100% within 200℃-450℃, NO conversion rate of the sample without loadingV2O5 can be also close to 100% within 250℃-450℃, it shows that TiCeOx porous material itself has the activity center of NH3-SCR.