KMnO<sub>4</sub>溶液改性半焦对烟气中气态Hg<sup>0</sup>的吸附性能研究

王力; 陈继涛; 张华伟; 李敏; 张林林; 刘珊珊

KMnO₄溶液改性半焦对烟气中气态Hg⁰的吸附性能研究

山东科技大学化学与环境工程学院, 山东青岛 266590

基金项目: 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)。

详细信息

通讯作者:
陈继涛, 男, 硕士研究生, Tel: 0532-86057103, E-mail: cjthg2008@126.com。

中图分类号: TQ536.9
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出版历程
- 收稿日期: 2012-04-20
- 修回日期: 2012-07-02
- 刊出日期: 2012-12-31

Adsorption performance of semi-coke modified by KMnO₄ solution for gas-phase Hg⁰ in flue gas

College of Chemical and Environmental Engineering,Shandong University of Science and Technology, Qingdao 266590, China

摘要

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。
- 改性半焦 /
- KMnO₄溶液 /
- 气态Hg⁰ /
- 烟气脱汞 /
- 吸附性能
Abstract: 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.
- modified semi-coke /
- KMnO₄ solution /
- gas-phase Hg⁰ /
- mercury removing from flue gas /
- adsorption performance

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