Chemical Speciation and Removal Mechanism of Arsenic from Spent SCR Catalysts
文献类型：期刊论文
| 作者 | Zhao, Chen1,2; Wu, Wenfen1,2; Meng, Ziheng1,2; Li, Huiquan1,2; Wang, Chenye1; Wang, Xingrui1 |
| 刊名 | Cailiao Daobao/Materials Reports
 |
| 出版日期 | 2021-03-10 |
| 卷号 | 35期号:5页码:5001-5010 |
| ISSN号 | 1005023X |
| 关键词 | Sodium hydroxide - Coal fired power plant - Oxidation - Waste treatment - Coal - Leaching - X ray photoelectron spectroscopy - Fossil fuel power plants - Vanadium pentoxide - Efficiency |
| DOI | 10.11896/cldb.20060294 |
| 英文摘要 | The valence state and speciation of As in spent SCR catalysts used in coal-fired power plants was studied by XPS and ICP. The results show that As in spent SCR catalysts exists in the form of As2O3 and As2O5. As2O3 is difficult to be leached directly in weak alkaline solution, so it is difficult to be removed completely. In order to solve this problem, the alkali method with oxidant added was proposed. The effects of oxidizer species, time, temperature, NaOH concentration, H2O2 concentration, solid to liquid ratio on the removal efficiency of As were studied. The results show that the removal efficiency of As could reach as high as 98.5% under the optimal leaching conditions of reaction temperature 30, reaction time 4 h, NaOH concentration 10wt%, H2O2 concentration 5wt%, the ratio of liquid to solid 2 mL/g, and the arsenic oxide content in the solid was reduced from 1 334脳10-6 to 50脳10-6. The content of As in detoxified SCR catalysts could reach the requirement of fresh SCR catalysts. The removal mechanism of As was studied by EPR and XPS methods, and a new advanced oxidation process was used to treat spent SCR catalysts. The V2O5 in spent SCR catalysts reacts with NaOH to form HV2O5- and VO43-. Under the influence of HV2O5- and VO43- in the leaching solution, H2O2 produces hydroxyl radicals (鈥H) in alkali solution. Hydroxyl radicals have strong oxidizing properties and oxidize As3+, which is not easily soluble in weak alkali, to As5+. 漏 2021, Materials Review Magazine. All right reserved. |
| 学科主题 | Catalysts |
| 项目编号 | This work was financially supported by the National Key Research and Development Program of China (2019YFC1907502) and Youth Program of National Natural Science Foundation of China (51904287). |
| 出版者 | Cailiao Daobaoshe/ Materials Review |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/60289]  |
| 作者单位 | 1.Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Cleaner Production Technology of Hydrometallurgy, Institute of Process Engineering, Chinese Academy of Sciences, Beijing; 100190, China 2.School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China |
| 推荐引用方式 GB/T 7714 | Zhao, Chen,Wu, Wenfen,Meng, Ziheng,et al. Chemical Speciation and Removal Mechanism of Arsenic from Spent SCR Catalysts[J]. Cailiao Daobao/Materials Reports,2021,35(5):5001-5010. |
| APA | Zhao, Chen,Wu, Wenfen,Meng, Ziheng,Li, Huiquan,Wang, Chenye,&Wang, Xingrui.(2021).Chemical Speciation and Removal Mechanism of Arsenic from Spent SCR Catalysts.Cailiao Daobao/Materials Reports,35(5),5001-5010. |
| MLA | Zhao, Chen,et al."Chemical Speciation and Removal Mechanism of Arsenic from Spent SCR Catalysts".Cailiao Daobao/Materials Reports 35.5(2021):5001-5010. |
入库方式： OAI收割
来源：过程工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。