SO_2与Fe_2O_3生成Fe(Ⅱ)(aq)和硫酸盐的复相反应机理  

Formation of Fe(Ⅱ)(aq) and Sulfate via Heterogeneous Reaction of SO_(2) with Fe_(2)O_(3)

作　　者：张秋菊[1] 王晓[1] 陈建民[1] 庄国顺[1] 

机构地区：[1]复旦大学环境科学与工程系大气化学研究中心,上海200433

出　　处：《高等学校化学学报》2006年第7期1347-1350,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学重点基金(批准号:40533017);国家自然科学基金(批准号:20377008;20477004);教育部博士学科点基金(批准号:20030246029)资助

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.The formation mechanism of Fe（ Ⅱ ） （aq） and sulfate via heterogeneous reaction of SO2 oxidation on the surface of Fe2O3 was 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 Fe203with the exhaustion of 53.6 p^g SO2, it could produce 12. 6 ng Fe（ Ⅱ ） （aq） and 56. 2 μg SO4^2-. The concentration of the product, [ SO4^2- ], was three orders of magnitude higher than that of Fe （ Ⅱ ） （aq） , indicating that large amount of SO4^2- production was formed via catalysis by the transitional metal Fe. The reaction mechanism of SO2 oxidation on Fe2O3 is proposed.

关 键 词：复相反应 FE2O3 SO2 Fe(Ⅱ)(aq) 硫酸盐 

分 类 号：O643[理学—物理化学] X131.1[理学—化学]