The Study On Simultaneous Catalytic Reductions Of No And SO₂ By CO Over TiO₂/γ-Al₂O₃ Catalyst

SO2 and NOx are both of the main atmospheric pollutants which seriously affect human health and our living environment, It is our duty to find out an effective method of controlling air pollution to solve the problem of pollution of sulfur dioxide and nitrogen oxides, and the direct catalytic reduction of SO2 and NO of flue gas technology is the catalytic reduction process of SO2 and NOx were converted to S elemental and N2 by the reducing agent(NH3, CH4 and CO, etc.) acting under catalytic agent, this technology is simple and easy to control which can achieve the purpose of removing SO2 and NOx simultaneously, also the choice of reductant has diversity. In this study, in order to explore the catalysts with preferable performance of desulfurization and denitration and the appropriate reaction conditions, the following work was done:1.A series of M/TiO2/γ-Al2O3(M= Ce2O3、Co3O4、Cr2O3、CuO、NiO、Fe2O3) were prepared by impregnation method and the impact factors such as the active component, roasting conditions, active component content, carrier on the catalytic activity of catalysts were investigated, the crystal phase structure, reduction activity, specific surface area and pore diameter size, surface morphology, precursor decomposition temperature and other main characteristics were studied by characterization methods of XRD、H2-TPR、BET、SEM、TG- MS techniques. The catalytic activity was researched by the activity evaluation device. The results showed that catalyst 12%NiO/ 15%TiO2/γ-Al2O3 and 12%Fe2O3/15%TiO2/γ-Al2O3, calcined for 3h at 500℃, had the best performance of desulfurization and denitration under the condition of 0.05%NO+0.10%SO2+0.30%CO(volume fraction). The highest desulfurization and denitration rate were 96.0% and 98.6% respectively.2. Four bimetallic catalysts(x)Fe2O3(y)NiO/TiO2/γ-Al2O3 、(x)Fe2O3(y)CuO/TiO2/γ-Al2O3、(x)NiO(y)Cu O/TiO2/γ-Al2O3, ect. were prepared by impregnation method and the effects of different ratio on the performance of desulfurization and denitration simultaneously were also studied. Experimental results showed that Fe2O3 and NiO contribute to synergistic catalytic effects. Catalyst 2Fe2O310NiO/TiO2/γ-Al2O3 had the highest activity, its highest denitration and desulfurization rate was 100% and 97% respectively.Fe-Cu bimetallic catalyst and Ni-Cu bimetallic catalyst have synchronization desulfurization denitration activity, but the reaction temperature is higher;3.Volume space velocity, reaction temperature, oxygen and other factors influence on the desulfurization denitration process of 2Fe2O310 Ni O /TiO2/γ-Al2O3 catalyst were studied. Experimental results showed that the volume space velocity was 6000 h-1, the continuous reaction temperature was 500℃, the catalyst has good desulfurization denitration activity, denitration rate up to 98%, the desulfurization rate of up to 96.6%.