Study On Simultaneous Catalytic Reduction Of Sulfur Dioxide And Nitric Oxide Over Iron Catalyst Doped With Rare Earth Oxide

Although we have entered the 21st century, coal is still the primary energy in our country and the condition will not be changed in short term. In view of the coal's foundation status in our country'energy structure (consumption ratio reaches 70%), thermal power is still the main power in China during the twelfth five-year. In the process of coal combustion, SO2 and NOx emissions cause serious air pollution, such as acid rain pollution, photochemical smog, greenhouse effect and so on. Especially, controlling nitrogen oxide is referred firstly in the twelfth five-year plans, moreover, the sulphur dioxide is needed to reduce 8%, and the nitrogen oxide is needed to reduce 10%.And because the mature separate desulfurization and denitration technology all cannot achieve simultaneous desulfurization and denitration.Therefore, the development of advanced simultaneous desulfurization and denitration technology for controlling the sulphur dioxide and nitrogen oxide emissions economically and effectively is a hot spot of desulfurization and denitration research in our country, even in the whole world.A series of different kinds of magnetic catalysts and Fe-Ce catalysts were prepared in this paper.Through simulating the experiment of catalytic reduction of SO2 and NO with CO in flue gas, the desulfurization activities of catalysts were investigated, moreover, the simultaneous desulfurization and denitration experiments over the best catalyst were studied and the impact of magnetic field on the simultaneous desulfurization and denitration were also explained, meanwhile, the XRD characterization for the catalysts were showed. The main research conclusions are as follows:⑴The magnetical 3mm 10% Fe₂O₃/γ-Al2O3 has the best desulfurization activity at low temperature of 300℃, consistent with the previous research results. The desulfurization activity of super paramagnetical 3mm 10% Fe₃O₄/γ-Al2O3 is better than paramagnetical 3mm 10% Fe₂O₃/γ-Al2O3 and the anti-magnetical catalyst.The desulfurization activity of the 3mm 10% Fe₂O₃/γ-Al2O3 with the method of total precipitation is better than the traditional immersion.⑵The time of activated completely of Fe-Ce catalysts doped with the different concentations of cerium oxide have positive correlations with the concentations of cerium oxides. Based on the former study results , the desulfurization activity of Fe-Ce catalysts have not positive correlation with the concentations of cerium oxides, 3mm 10% Fe₂O₃-6% CeO₂/γ-Al₂O₃ has the best desulfurization activity among all Fe-Ce catalysts.⑶The desulfurization activity of 10% Fe₂O₃-6% CeO₂/γ-Al₂O₃ have not the positive correlation with the particle size of support, and the desulfurization effect of 3mm 10% Fe₂O₃-6% CeO₂/γ-Al₂O₃ is better than 1mm10% Fe₂O₃-6% CeO₂/γ-Al₂O₃.⑷In condition of NO+SO₂+CO, 10% Fe₂O₃-6% CeO₂/γ-Al₂O₃ (3mm) have good desulfurization and denitration performance, and the desulfurization rate maintains more than 90%, and the denitration rate is approximately 100%.⑸Space velocity has significant influence on the effect of desulfurization and denitration, and the performance need to be investigated in future.