Effects of Multi-component Flue Gases on Hg0 Removal over HNO3-Modified Activated Carbon

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• 作者：Li Tong ; Wenqing Xu ; Xuan Zhou ; Ruihui Liu ; Tingyu Zhu
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：August 20, 2015
• 年：2015
• 卷：29
• 期：8
• 页码：5231-5236
• 全文大小：370K
• ISSN：1520-5029

文摘

The impact of the coexistence of SO₂ and NO in flue gas on Hg⁰ removal over HNO₃-modified activated carbon (HNO₃-AC) was evaluated. In addition, the effect of adding HCl on Hg⁰ removal was also investigated. Hg⁰ removal strongly depends upon the composition of the acidic gas. The results indicated that physically adsorbed SO₂ inhibited Hg⁰ removal because of competitive adsorption, while chemically adsorbed SO₂ slightly promoted Hg⁰ removal by generating HgSO₄. The formation of N-containing active species, such as NO₂, facilitates the removal of Hg⁰ in the presence of NO to primarily produce Hg(NO₃)₂ or HgO. In comparison to the study performed under NO, SO₂ suppressed Hg⁰ removal by weakening the amount of active NO₂ species that were generated over the samples. The presence of HCl strongly affected Hg⁰ removal, and HgCl₂ and Hg₂Cl₂ were produced in all of the flue gases containing HCl. In addition, the binding abilities between mercury and the different groups that formed on the samples follow the order: Cl- > S- > N-containing groups.