Study Of Effect Of Radical To Catalytic Reduction Of Sulfur Dioxide In The Presence Of Oxygen

Direct reduction of SO₂ by CO to elemental sulfur is the focus of flue gas desulfurization(FGD). O₂ make against reduction of SO₂ by CO. So it is significant studying how oxygen affects reductive reaction and catalyst. We will find out a way to eliminate this bad effect. The reducer source is another restrictive complication. We also shall find out low-cost reducer source.We studied the reductive reaction of SO₂ by CO in the presence of oxygen with sulfurized perovskite LaCoO₃ catalyst. It takes good result that radicals from pyrolysis of acetone operate to flue gas in the presence of oxygen with catalyst. Photolysis of CO₂ to CO is actualized by vacuum ultraviolet(VUV).After research we find out that sulfurized perovskite LaCoO₃ catalyst is composed by La₂O₂S and CoS. O₂ will by degrees oxygenate sulphide of catalyst to sulphate or oxid and catalyst will be deactivated. Retexture can get CoS back but not La₂O₂S. It is testified La₂O₂S can catalyze reaction of SO₂ by CO in the presence of oxygen little time but CoS can't. Pyrolysis of acetone produce a mass of CH₃ radicals which can react with O₂ rapidly and these radicals don't react with SO₂. Experiment attest pyrolysis of acetone don't destroy catalyst while O₂ is eliminated by CH₃ radicals. VUV gave off by electrolyze nitrogen can photolyze CO₂ to CO and the yield of CO enormously increase when there is CH₄(CH₃).The conclusion can be summed up. Sulfurized perovskite will be deactivated in the presence of oxygen because La₂O₂S and CoS phase is transformed to sulphate or oxid and La₂O₂S can't be regenerated. CH₃ radical can efficiently eliminate O₂ of flue gas and that it don't influence reductive reaction of SO₂ by CO. CH₃ radical is favorableness to the cracking of CO₂.