KMnO_4溶液改性半焦对烟气中气态Hg^0的吸附性能研究  

Adsorption performance of semi-coke modified by KMnO_4 solution for gas-phase Hg^0 in flue gas

作　　者：王力[1] 陈继涛[1] 张华伟[1] 李敏[1] 张林林[1] 刘珊珊[1] 

机构地区：[1]山东科技大学化学与环境工程学院,山东青岛266590

出　　处：《燃料化学学报》2012年第12期1498-1504,共7页Journal of Fuel Chemistry and Technology

基　　金：青岛市科技计划(08-2-l-16-nsh-3);山东科技大学研究生科技创新基金(YCA110362)

摘　　要：在小型固定床实验台上利用半焦及其KMnO4溶液改性样品进行气态Hg0吸附实验。结果表明,在低温时原料半焦对气态Hg0具有良好的吸附性能,升温则使其吸附性能迅速降低;经高锰酸钾溶液浸渍处理后,改性半焦在高温140℃时吸附性能明显提高,对浸渍样品在250℃进行热处理可使其吸附性能进一步提高。BET结果表明,原料半焦具有较发达的微孔结构,改性处理使微孔比例下降,孔隙结构发达程度降低;XPS测试表明,改性半焦表面的汞主要以氧化态(Hg2+)形式存在,高价锰化合物(KMnO4、K2MnO4、MnO2)是主要的氧化活性物质。In an attempt to develop a novel and more effective sorbent with low-cost for the removal of gas- phase Hg0 from flue gas, the adsorption performance of semi-coke and KMnO4 solution-modified semi-coke for gas-phase Hg0 was investigated with a bench-scale fixed-bed reactor system. The experimental results suggest that the adsorption performance of semi-coke is good at low temperature but weak at higher temperature. The semi- cokes impregnated by KMnO4 solution have excellent adsorption performance for gas-phase Hg0 at 140 ℃, and can be further enhanced by heating the impregnated samples at 250 ℃. The BET analysis shows that the semi- coke has rich micro-pores but become poor after modification. The XPS results indicates that the adsorbed mercury on the surface of the modified semi-coke samples mainly exists in oxidation state （Hg2＋） and these compounds （ KMnO4, K2MnO4 and MnO2 ） play a key role in the oxidation reaction of gas-phase Hg0.

关 键 词：改性半焦 KMnO4溶液 气态Hg0 烟气脱汞 吸附性能 

分 类 号：TQ536.9[化学工程—煤化学工程]