Citation: LI Yang, LIU Bing, YANG He, YANG Da-wei, HU Hao-quan. Removal of elemental mercury (Hg⁰) from simulated flue gas over MnO_x-TiO₂ sorbents[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(5): 513-524. shu

Removal of elemental mercury (Hg⁰) from simulated flue gas over MnO_x-TiO₂ sorbents

LI Yang ^1,, ,
LIU Bing ¹ ,
YANG He ¹ ,
YANG Da-wei ² ,
HU Hao-quan ¹

1.
State Key Laboratory of Fine Chemicals, Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
2.
Environmental Protection Bureau of Chao Yang County, Chaoyang 122000, China

Corresponding author: LI Yang, yli@dlut.edu.cn
Received Date: 13 January 2020
Revised Date: 23 March 2020

Fund Project: National Natural Science Foundation for Young Scientist of China 51306028the National Natural Science Foundation of China 21776039the Fundamental Research Funds for the Central Universities DUT2018TB0The project was supported by the National Natural Science Foundation of China (21776039), National Natural Science Foundation for Young Scientist of China (51306028) and the Fundamental Research Funds for the Central Universities (DUT2018TB0)

Figures(13)

A series of MnO_x modified TiO₂ based sorbents were synthesized using wet impregnation method and its performance on elemental mercury (Hg⁰) removal was studied. The effects of loading amount, calcination temperature, reaction temperature, and flue gas compositions on mercury removal efficiency were investigated. The sorbents were characterized by TGA, N₂ adsorption-desorption, XRD, FT-IR, XPS and Hg-TPD. It was shown that the optimum MnO_x loading value was 12%, and the optimal calcination and reaction temperature were 450 and 300 ℃, respectively. The highest mercury removal efficiency of MnO_x-TiO₂ sorbent was 98.46%. O₂ and HCl in flue gas played a positive role in mercury removal. SO₂ had a strong inhibitory effect on mercury removal, which may be due to the competition adsorption between SO₂ and Hg⁰. At the same time, the manganese sulfate produced during the reaction covered the surface of the active site, resulting in the decrease in mercury removal efficiency. CO₂ and NO in flue gas also slightly inhibited mercury removal. Mn⁴⁺ participated in oxidizing Hg⁰ to Hg²⁺, accompanied with its reduction to Mn³⁺. The adsorption and oxidation process of Hg⁰ over MnO_x-TiO₂ basically conformed to the Mars-Maessen mechanism and Langmuir-Hinshelwood mechanism.
- simulated flue gas,
- sorbent,
- mercury removal,
- MnO_x,
- TiO₂
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Removal of elemental mercury (Hg0) from simulated flue gas over MnOx-TiO2 sorbents

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Removal of elemental mercury (Hg⁰) from simulated flue gas over MnO_x-TiO₂ sorbents