• 关键词：Fe(Ⅲ)  催化氧化  S(Ⅳ)  脱硫

• 基金项目：国家自然科学基金项目(20176032)

• 赖庆柯
• 四川大学化工学院,成都610065;重庆三峡学院化工系,重庆404000

• 张永奎
• 四川大学化工学院,成都610065

• 梁斌
• 四川大学化工学院,成都610065

• 巩长旸
• 四川大学化工学院,成都610065

• 摘要：利用酸性铁离子溶液在鼓泡反应器中进行了模拟烟道气SO₂脱出实验研究。 在总铁离子浓度为1.72×10^-2～4.12×10^-1mol·L^-1、总S(Ⅳ)浓度为3.32×10^-5～7.81×10^-5mol·L^-1、O₂含量1%～10%(干重)、pH为0.8～2.2、温度为25～32℃的范围内, 研究了水合Fe(Ⅲ)离子与氧化物之间的配合

• Abstract：Experimental investigations were carried out on the removal of simulated flue gas SO₂ using acid ferric ion aqueous solution in a bubbling reactor. The complex formation reactions between aquated Fe(Ⅲ) ions and S(Ⅳ) oxides were studied under the following conditions. The concentration of total ferric ion was 1.72×10^-2～4.12×10^-1 mol·L^-1, the concentration of total S(Ⅳ) oxides ion was 3.32×10^-5～7.81×10^-5 mol·L^-1, the content of O₂ was 1%～10%, pH range was 0.8～2.2 and the temperature was 25℃～32℃. The results showed that there was an optimal desulfuration effect when the total ferric ion concentration was 0.13 mol·L^-1. The complex in solution was mainly the dimeric hydroxo-ferric ions when the total ferric ion concentration was relatively low (e.g., lower than 0.13 mol·L^-1), and under this condition the formation and decomposition of the complex between ferric ion and sulfite was the step for controlling the reaction rate. On the other hand, when the concentration of ferric (Ⅲ) was more than 0.13 mol·L^-1, a space baffle effect was formed by big groups when reacted with sulfite and resulted in a decrease in the reaction rate, because the formation of polynuclear complex, such as the poly-hydroxo-ferric (Ⅲ) complex and the sulfite complex of ferric (Ⅲ) iron, etc. From the experimental results and theoretical analysis, the mechanism of the desulphrization reaction was supposed as the combination of complexation and catalytic oxidation and free radical reaction.

• Key words：Fe(Ⅲ)  catalytic oxidation  S(Ⅳ)  desulphurization

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