MnOx/HZSM-5去除烟气中元素态汞的实验研究  

Experimental study of removing elemental mercury from flue gas by MnO_x/HZSM-5

作　　者：陈玲[1] 李彩亭[1] 高招[1] 樊小鹏[1] 彭敦亮[1] 崔华飞[1] 

机构地区：[1]f湖南大学环境科学与工程学院,环境生物与控制教育部重点实验室,湖南长沙410082

出　　处：《中国环境科学》2010年第8期1026-1031,共6页China Environmental Science

基　　金：国家自然科学基金资助项目(50878080);长沙市科技重大专项(K0902006-31)

摘　　要：采用浸渍法制备了一系列的MnO_x/HZSM-5,在实验烟气中研究了MnO_x/HZSM-5对Hg^0的去除行为,并运用比表面(BET)和X-射线衍射(XRD)技术对其进行了表征.结果表明,在6%O_2条件下HZSM-5本身具有良好的去除Hg^0的性能,改性后的分子筛对Hg^0吸附和氧化的能力得到改善,且MnO_x负载量在10%时效果最佳;适当升高反应温度能增强脱汞效率,300℃为最佳反应温度;烟气中O_2能促进汞的氧化,而NO和SO_2与汞竞争MnO_x/HZSM-5上的活性位,对Hg^0的氧化有一定的抑制作用.此外,研究还发现,在MnO_x/HZSM-5吸附剂上Hg^0主要是经氧化形成HgO,其脱汞机理在一定程度上符合Mars-Maessen机理.A series of HZSM-5 zeolite loading MnOx were prepared by impregnation method to investigate their removal characteristics of Hg^0 in experimental flue gas,and characterized by X-ray diffraction（XRD） and surface area measurement（BET） methods.These experimental results suggested that HZSM-5 had good activity on removing Hg^0 in the presence of 6%O2.After loading active components MnOx on HZSM-5 zeolite,the removal efficiency of Hg^0 could be increased,and the best loading amount was 10%.Rising reaction temperature appropriately could enhance the removal efficiency of Hg^0,and the optimum temperature was 300℃.O2 in flue gas could promote the oxidation of Hg^0 while NO and SO2 inhibited the mercury oxidation due to the competition of active sites on MnOx/HZSM-5 sorbents with Hg^0. Additionally,it was verified that Hg^0 on MnOx/HZSM-5 adsorbents was mainly oxidized into HgO,which agreed with the Mars-Maessen mechanism to a certain extent.

关 键 词：HZSM-5 MnO_x Hg^0 吸附 氧化 

分 类 号：X701.2[环境科学与工程—环境工程]