Cu-modified Fe-Mn magnetic mercury adsorbent and anti-SO2 characteristic

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-02-14 DOI:10.1002/apj.3045

Yu Shang, Ruhao Gong, Yufeng Duan, Qiang Zhou

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Abstract

A series of Fe₆Mn₁Cu_x adsorbents for mercury removal were prepared by using co-precipitation and impregnation methods. The performance of mercury adsorption and anti-SO₂ characteristic was studied in a fixed-bed experimental system. The effect of Cu doping amount, reaction temperature, and flue gas components on mercury removal was investigated. The mercury species on the spent adsorbent was analyzed through Hg-TPD test. The physical–chemical features were characterized by using the N₂ adsorption/desorption, VSM, XPS, and XRD. It was found that the Fe₆Mn₁Cu_0.4 exhibited a high performance of mercury adsorption and well magnetic property and good sulfur resistance. Under high concentration of SO₂, the average adsorption efficiency of Fe₆Mn₁Cu_0.4 adsorbent achieved 99%. Cu modification optimized the pore structure and improved the mercury removal performance as well as SO₂ resistance. The XPS analysis indicated that Mn⁴⁺ was the main form that played an important role in oxidizing Hg⁰, as a result of decrement of Mn⁴⁺ after mercury adsorption. Mercury adsorbed on the spent adsorbent was HgO and HgSO₄.

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铜改性铁锰磁性汞吸附剂和抗二氧化硫特性

采用共沉淀法和浸渍法制备了一系列用于脱汞的 Fe6Mn1Cux 吸附剂。在固定床实验系统中研究了其汞吸附性能和抗二氧化硫特性。研究了铜掺杂量、反应温度和烟气组分对汞去除的影响。通过 Hg-TPD 试验分析了废吸附剂上的汞物种。利用 N2 吸附/解吸、VSM、XPS 和 XRD 对物理化学特征进行了表征。结果表明，Fe6Mn1Cu0.4 具有较高的汞吸附性能、良好的磁性和抗硫性能。在高浓度二氧化硫条件下，Fe6Mn1Cu0.4 吸附剂的平均吸附效率达到 99%。铜改性优化了孔隙结构，提高了脱汞性能和抗二氧化硫性能。XPS 分析表明，Mn4+ 是氧化 Hg0 的主要形式，这是因为汞吸附后 Mn4+ 减少了。废吸附剂上吸附的汞为 HgO 和 HgSO4。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.