Fe-Mn二元复合离子液体协同催化氧化去除二氧化硫的研究.doc

  Fe-Mn 二元复合离子液体协同催化氧化去 除二氧化硫的研究# 郭惠锋，张婷婷，余江** 5 10 15 20 25 30 35 40 （北京化工大学化学工程学院环境催化与分离过程研究组，北京 100029） 摘要：以氯化丁基甲基咪唑（ [Bmim]Cl）、无水氯化锰（ MnCl2）和六水合三氯化铁 （FeCl3·6H2O）为原料合成 Fe-Mn 二元复合离子液体。利用紫外光谱仪、傅里叶变化红外 光谱仪、拉曼光谱仪分析了离子液体的表面结构和基本组成。将制得的复合离子液体与 H2O、 乙醇三元溶液体系用于催化氧化脱除二氧化硫，考察了复合离子液体中不同锰含量对脱硫效 率和产物硫酸根含量的影响。实验结果表明：Fe-Mn 复合离子液体比单独 Fe-IL 具有更高的 催化氧化活性；锰的存在提高了复合离子液体对 SO2 的去除率，并增加了脱硫产物中硫酸根 的含量；当 MnCl2:FeCl3 的摩尔比为 0.2:1 时，脱硫率可达 99.3%，产物中硫酸根的含量可达 54.1%。据脱硫实验，初步解析了反应机理。研究证实，Fe-IL 和 Mn-IL 直接混合所得的 Fe-Mn 复合离子液体是一种高效、绿色的新型脱硫剂。 关键词：复合离子液体；铁(III)-锰(II)二元体系；脱硫；催化氧化；二氧化硫 中图分类号：X701.3 Catalytic oxidation of sulfur dioxide using Fe-Mn composited ionic liquid GUO Huifeng, ZHANG Tingting, YU Jiang (Research Group of Environmental Catalysis Separation Process, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029) Abstract: An iron-manganese composited ionic liquid was synthesized using 1-butyl-3- methylimidazolium, anhydrous manganese chloride and ferric chloride hexahydrate. The structure of the composited ionic liquid was detected by UV spectra , FT-IR and FT-Raman spectra. A ternary system of the composited ionic liquid, water and ethanol was used to remove of sulfur dioxide. The results show that Fe-Mn composited ionic liquid presents a better desulfurization performance than Fe-IL, and the existence of manganese in the composited ionic liquids can improve the desulfurization ability, and increase the amount of reaction product sulfuric acid. When the mole ratio of MnCl2 to FeCl3 was 0.2:1, the desulfurization efficiency reached up to 99.3% and the content of sulfuric acid was up to 54.1%. The catalytic oxidation mechanism of the composited ionic liquid on the removal of sulfur dioxide is proposed. It proves that the Fe-Mn-IL is a kind of high efficient, environment friendly desulfurizing reagent. Keywords: Composited ionic liquid; binary system of manganese(II) and iron(III); desulfurization; catalytic oxidation; sulfur dioxide 0 引言 我国的大气污染以煤烟型为主，