SO_2和NO浓度对TiO_2-硅酸铝纤维脱除元素汞的影响  

Effects of SO_2 and NO on removal of elemental mercury using a TiO_2-aluminum silicate fiber

作　　者：袁媛[1] 张军营[1] 赵永椿[1] 王宇翔[1] 郑楚光[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《燃料化学学报》2012年第5期630-635,共6页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(40972102;50936001;51021065);国家重点基础研究发展规划(973计划;2011CB201500)

摘　　要：使用溶胶凝胶法制备了TiO2-硅酸铝纤维纳米复合材料。使用此复合材料在波长为253.7 nm的紫外光照射下脱除模拟烟气中的元素汞,实验研究了SO2和NO浓度对光催化脱汞的影响以及温度对脱汞率的影响。结果表明,常温时烟气中SO2浓度对光催化脱汞表现出促进作用,当SO2浓度为1 200μg/m3时脱汞率最高可达93%。NO浓度对光催化脱汞表现出抑制作用,随着NO浓度的增加脱汞率逐渐降低。高温时SO2和NO浓度对光催化脱汞的作用规律与常温时相似。随着模拟烟气温度的升高,脱汞率逐渐减低,升高温度对光催化脱汞表现出抑制作用。A novel TiO2-aluminum silicate fiber nanocomposite was prepared by sol-gel method,and used to remove the elemental mercury from a simulated coal-fired flue gas under UV irradiation at a wavelength of 253.7nm.The effects of SO2,NO and temperature on the photocatalytic removal of mercury were tested.The result shows that SO2 has a stimulative effect on the photocatalytic removal of mercury at ambient temperature.The mercury removal can reach to 93% when the SO2 concentration is 1200μg/m3.However,NO shows an inhibitory effect on the elemental mercury removal,and the removal efficiency decreases with the increasing of NO concentration.At high temperature,the effects of SO2 and NO on the photocatalytic removal of mercury are the same as those at the normal temperature.The mercury removal efficiency decreases as the temperature increases.Elevating temperature shows an inhibitory effect on the photocatalytic removal of mercury.

关 键 词：纳米TiO2复合材料 光催化 SO2 NO 脱汞 

分 类 号：X7[环境科学与工程—环境工程]