【摘要】 使用DR IFTS,XPS,HPLC和IC考察了常温、常压和氧气存在下SO2与Fe2O3的复相反应,结果表明,SO2在Fe2O3表面的反应活性与Fe2O3表面含水量密切相关,表面含水量增加有助于Fe(Ⅱ)(aq)和硫酸盐的生成.室温下(T=291 K,相对湿度68%),每毫克Fe2O3在30 m in内可消耗53.6μg SO2,生成12.6 ngFe(Ⅱ)(aq)和56.2μg SO42-.反应产物SO42-的浓度比Fe(Ⅱ)(aq)的浓度高3个数量级,表明在生成硫酸盐的复相反应中铁对SO2氧化具有非常高的催化活性.提出了Fe(Ⅱ)(aq)和硫酸盐的生成机理.更多还原

【Abstract】 The formation mechanism of Fe（Ⅱ）（aq） and sulfate via heterogeneous reaction of SO₂ oxidation on the surface of Fe₂O₃was investigated at the normal temperature,pressure and in the presence of oxygen by DRIFTS,XPS,HPLC and IC.The results revealed that the reaction activity of SO₂with Fe₂O₃was closely related to the amount of absorbed water on the surface of Fe₂O₃,which was favorable for the formation of（Fe（Ⅱ））（aq） and S（Ⅵ）.Under ambient condition[T=291 K,relative humidity（RH）=68%] within 30 min,for 1 mg Fe₂O₃with the exhaustion of 53.6 μg SO₂,it could produce 12.6 ng Fe（Ⅱ）（aq） and 56.2 μg SO^2-₄.The concentration of the product,[SO^2-₄],was three orders of magnitude higher than that of Fe（Ⅱ）（aq）,indicating that large amount of SO^2-₄ production was formed via catalysis by the transitional metal Fe.The reaction mechanism of SO₂ oxidation on Fe₂O₃ is proposed.更多还原