Oxidation of elemental mercury by modified spent TiO2-based SCR-DeNOx catalysts in simulated coal-fired flue gas
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- 作者：Lingkui Zhao ; Caiting Li ; Xunan Zhang…
- 关键词：Catalytic oxidation ; Manganese oxide ; Cerium oxide ; Elemental mercury ; Low temperature
- 刊名：Environmental Science and Pollution Research
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：23
- 期：2
- 页码：1471-1481
- 全文大小：1,331 KB
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Caiting Li (1) (2)
Xunan Zhang (1) (2)
Guangming Zeng (1) (2)
Jie Zhang (1) (2)
Yin’e Xie (1) (2)
1. College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People’s Republic of China
2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People’s Republic of China - 刊物类别：Earth and Environmental Science
- 刊物主题：Environment
Environment
Atmospheric Protection, Air Quality Control and Air Pollution
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
Industrial Pollution Prevention - 出版者：Springer Berlin / Heidelberg
- ISSN：1614-7499
文摘
In order to reduce the costs, the recycle of spent TiO2-based SCR-DeNOx catalysts were employed as a potential catalytic support material for elemental mercury (Hg0) oxidation in simulated coal-fired flue gas. The catalytic mechanism for simultaneous removal of Hg0 and NO was also investigated. The catalysts were characterized by Brunauer-Emmett-Teller (BET), scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) method. Results indicated that spent TiO2-based SCR-DeNOx catalyst supported Ce-Mn mixed oxides catalyst (CeMn/SCR1) was highly active for Hg0 oxidation at low temperatures. The Ce1.00Mn/SCR1 performed the best catalytic activities, and approximately 92.80 % mercury oxidation efficiency was obtained at 150 °C. The inhibition effect of NH3 on Hg0 oxidation was confirmed in that NH3 consumed the surface oxygen. Moreover, H2O inhibited Hg0 oxidation while SO2 had a promotional effect with the aid of O2. The XPS results illustrated that the surface oxygen was responsible for Hg0 oxidation and NO conversion. Besides, the Hg0 oxidation and NO conversion were thought to be aided by synergistic effect between the manganese and cerium oxides. Keywords Catalytic oxidation Manganese oxide Cerium oxide Elemental mercury Low temperature