Hg0 Conversion over Sulfureted HPMo/r-Fe2O3 with HCl at Low Temperatures: Mechanism, Kinetics,and Application in Hg0 Removal from Coal-Fired Flue Gas

Chang Wang; Yulei Ma; Pengjian Lv

首页> 外文期刊>Environmental Science & Technology: ES&T >Hg0 Conversion over Sulfureted HPMo/r-Fe2O3 with HCl at Low Temperatures: Mechanism, Kinetics,and Application in Hg0 Removal from Coal-Fired Flue Gas

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Hg0 Conversion over Sulfureted HPMo/r-Fe2O3 with HCl at Low Temperatures: Mechanism, Kinetics,and Application in Hg0 Removal from Coal-Fired Flue Gas

机译：Hg0 Conversion over Sulfureted HPMo/r-Fe2O3 with HCl at Low Temperatures: Mechanism, Kinetics,and Application in Hg0 Removal from Coal-Fired Flue Gas

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Recently, sulfureted metal oxides have been developed for the catalytic oxidation of Hg° to HgCl2 using HCl as an oxidant at low temperatures, and they exhibit excellent Hg° removal performance. Owing to the lack of reaction mechanisms and kinetics, further improvement in their performance for Hg° conversion is extremely restricted. In this study, the reaction mechanism of Hg° conversion over sulfureted HPMo/j,-Fe203 with HCl at low temperatures was investigated using Hg balance analysis and transient reaction. The chemical adsorption of Hg° as HgS and the catalytic oxidation of Hg° to HgCl2 both contributed to Hg° conversion over sulfureted HPMo/y-Fe2O3 Meanwhile, the formed HgCl2 can adsorb onto sulfureted HPMo/r-Fe2O3. Then, the kinetics of Hg° conversion, Hg' adsorption, and HgCl2 desorption were developed, and the kinetic parameters were gained by fitting the Hg balance curves. Subsequently, the inhibition mechanism of H2O and SO2 on Hg° conversion over sulfureted HPMo/r-Fe2O3 was determined by comparing the kinetic parameters. The kinetic model suggested that both HgCl2 resulting from Hg° oxidation and unoxidized Hg° can be completely adsorbed on sulfureted HPMo/r-Fe2O3 with a moderate mass hourly space velocity. Therefore, sulfureted HPMo/r-Fe2O3 can be developed as a reproducible sorbent for recovering Hg° emitted from coal-fired power plants.

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来源
《Environmental Science & Technology: ES&T》 |2023年第1期|697-707|共11页
作者
Chang Wang; Yulei Ma; Pengjian Lv;
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作者单位

School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, P. R. China;

School of Environment and Civil Engineering Jiangnan University, Wuxi 214122, P. R. China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
Hg° adsorption; Hg° oxidation to HgCl2; HgCl2 adsorption; kinetic analysis; Hg-TPD; transient reaction; coal-fired flue gas;

Hg0 Conversion over Sulfureted HPMo/r-Fe2O3 with HCl at Low Temperatures: Mechanism, Kinetics,and Application in Hg0 Removal from Coal-Fired Flue Gas

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