Novel Effective Catalyst for Elemental Mercury Removal from Coal-Fired Flue Gas and the Mechanism Investigation

Environmental Science & Technology
Wanmiao ChenNaiqiang Yan

Abstract

Mercury pollution from coal-fired power plants has drawn attention worldwide. To achieve efficient catalytic oxidation of Hg(0) at both high and low temperatures, we prepared and tested novel IrO2 modified Ce-Zr solid solution catalysts under various conditions. It was found that the IrO2/Ce0.6Zr0.4O2 catalyst, which was prepared using the polyvinylpyrrolidone-assisted sol-gel method, displayed significantly higher catalytic activity for Hg(0) oxidation. The mechanism of Hg(0) removal over IrO2/Ce0.6Zr0.4O2 was studied using various methods, and the Hg(0) oxidation reaction was found to follow two possible pathways. For the new chemisorption-regeneration mechanism proposed in this study, the adsorbed Hg(0) was first oxidized with surface chemisorbed oxygen species to form HgO; the HgO could desorb from the surface of catalysts by itself or react with adsorbed HCl to be release in the form of gaseous HgCl2. O2 is indispensable for the chemisorption process, and the doping of IrO2 could facilitate the chemisorption process. In addition, the Deacon reaction mechanism was also feasible for Hg(0) oxidation: this reaction would involve first oxidizing the adsorbed HCl to active Cl species, after which the Hg(0) could react with Cl to...Continue Reading

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Citations

Dec 12, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Deshetti JampaiahSuresh K Bhargava
Mar 22, 2021·Journal of Environmental Sciences (China)·Qiangwei LiLidong Wang
Mar 28, 2021·The Science of the Total Environment·Chunhui LiJiyan Shi
Aug 22, 2017·Environmental Science & Technology·Tiantian CaoZhenghe Xu
Jun 11, 2019·Environmental Science & Technology·Jinchen MaHaibo Zhao
Aug 25, 2020·Environmental Science & Technology·Qinyuan HongNaiqiang Yan
Dec 21, 2016·Environmental Science & Technology·Shangchao XiongShijian Yang
Feb 26, 2019·Environmental Science & Technology·Zequn YangKaimin Shih

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