氧化铁吸收S0_2的反应机理  

Mechanism of Sulphur Dioxide Absorption on Ferric Oxide

作　　者：吴菊贤[1] 刘世斌[1] 韩镇海 

机构地区：[1]太原工业大学

出　　处：《硫酸工业》1992年第5期18-23,64,共6页Sulphuric Acid Industry

基　　金：山西省科学基金资助项目

摘　　要：通过实验,研究了三种晶型的氧化铁脱硫剂(Fe_3O_4、γ-Fe_2O_3和α-Fe_2O_8)对SO_2的吸收特性。结果表明,在380～450℃的温度范围,对于新制脱硫剂,Fe_3O_4的脱硫速率最快;而对于再生后的脱硫剂,不同初始晶型的氧化铁均转化成α-Fe_2O_3,并且其活性较初始α-Fe_2O_3有较大幅度的提高。X射线分析表明,氧化铁吸收SO_2后的产物主要为Fe_2(SO_4)_3。吸收剂在645℃下再生,放出SO_2和SO_3。对氧化铁吸收SO_2的过程进行了热力学计算,表明在450℃下,吸收反应为不可逆反应,脱硫率可达100％。探讨了因氧化铁表面吸附水蒸汽而加速SO_2吸附及氧化的作用机理。Absorption features of SO2 on three ferric oxides ( Fe2O4, γ-Fe2O4 and α-Fe2O3) were studied experimentally. In the temperature range of 389-450℃,Fe3O4 afforded a fastest absorption rate among all fresh absorbents tested, but after regeneration,the all absorbents in different initial crystalls transferred into α-Fe2O3 and moreover had a much better activity than the fresh α-FetO3. X-ray analysis showed that the main absorption product was Fei(SO4)3. The absorbents were regenerated at 645℃, giving off SO2 and SO3. The thermodynamical calculation showed the absorption reaction of SO2 with ferric oxides is a non-reversible reaction and 100% S will be removed. Also discussed is the mechanism of acoeleratingSO2 adsorption and oxidation through adsorption of HzO vapour on the surface of ferric oxides.

关 键 词：氧化铁 吸收 二氧化硫 反应 

分 类 号：TQ138.1[化学工程—无机化工]