https://scholars.lib.ntu.edu.tw/handle/123456789/425134
標題: | Preparation of Cu-Mn and Cu-Mn-Ce oxide-incorporated mesoporous silica via silicate exfoliation for the removal of NO and Hg<sup>0</sup> | 作者: | Lin, Cong Jhen Chang, Chuan Lin Tseng, Chih Fu Lin, Hong Ping HSING-CHENG HSI |
關鍵字: | Coal combustion | Mercury | Metal oxide | Multi-pollutant | Silicate exfoliation | 公開日期: | 1-六月-2019 | 出版社: | TAIWAN ASSOC AEROSOL RES-TAAR | 卷: | 19 | 期: | 6 | 起(迄)頁: | 1421 | 來源出版物: | Aerosol and Air Quality Research | 摘要: | © Taiwan Association for Aerosol Research. Cu-Mn and Cu-Mn-Ce oxide-incorporated mesoporous silica was formed by hydrothermally exfoliating silicate, and the physicochemical properties and NO/Hg0 removal efficiency were investigated. The exfoliation induced structural reformation, resulting in a large specific surface area and the uniform dispersion of metal oxides on the surface. The transfer of valences between Cu2+ and Mn3+ in the Cu-Mn silica contributed to the single reduction peak displayed in the H2 temperature-programmed reduction profiles and the high Mn4+/Mn and Cu+/Cu ratios observed via X-ray photoelectron spectroscopy (XPS). The high oxygen lability of the Cu-Mn silica may have inhibited its ability to remove NO. By contrast, when SO2 was present, incorporating Ce enhanced the NO removal efficiency due to the increased number of Brønsted acid sites. Hg0 removal tests indicated that adsorption was the primary removal mechanism for both the Cu-Mn and the Cu-Mn-Ce silica samples. Cu2Mn8 exhibited the highest Hg removal efficiency, suggesting that Ce’s enhancing effect on Hg0 adsorption was diminished when a large amount of Mn was present. Of the gaseous components, the adsorbed HCl was mainly responsible for the oxidation and subsequent adsorption of Hg0. Furthermore, with the addition of SO2, the competitive adsorption of SO2 and the resulting HgCl2 did not decrease the Cu-Mn silica’s efficiency in oxidizing Hg0, but the oxidized Hg was less adsorptive. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/425134 | ISSN: | 16808584 | DOI: | https://api.elsevier.com/content/abstract/scopus_id/85068735237 10.4209/aaqr.2018.10.0389 |
顯示於: | 環境工程學研究所 |
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21_AAQR-18-10-OA-0389_1421-1438.pdf | 2.55 MB | Adobe PDF | 檢視/開啟 |
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