Citation: LI Yang, CHEN Wei, ZHAO Yong-chun, LI Hai-long, ZHANG Jun-ying, LI Jie, HU Hao-quan. Removal of elemental mercury from flue gas by Fe/Al-SiO₂ complex[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(12): 1409-1416. shu

Removal of elemental mercury from flue gas by Fe/Al-SiO₂ complex

LI Yang ¹ ,
CHEN Wei ¹ ,
ZHAO Yong-chun ² ,
LI Hai-long ³ ,
ZHANG Jun-ying ² ,
LI Jie ⁴ ,
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.
State Key of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
3.
School of Energy Science and Engineering, Central South University, Changsha 410083, China
4.
School of Environmental Science and Technology, Dalian 116024, China

Corresponding author: HU Hao-quan, hhu@dlut.edu.cn
Received Date: 14 May 2019
Revised Date: 17 October 2019

Fund Project: the 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)National Natural Science Foundation for Young Scientist of China 51306028

Figures(9)

The Fe/Al-SiO₂ composite metal oxides were prepared by various methods to simulate the composition of red mud. A series of experiments were carried out to study the mercury removal performance from simulated flue gas. The results show that the composite metal oxide obtained by sol-gel method has an excellent mercury removal performance in a temperature range of 300-450 ℃. Among them, average mercury removal efficiency can reach 94.8% within 3 h at 350 ℃. Fe₂O₃ provides lattice oxygen and chemical adsorbed oxygen for the oxidation of Hg⁰, and SiO₂ is conducive to the dispersion of the active component Fe₂O₃, which enhances the contact between Hg⁰ and the active sites. In the presence of trace HCl and NO in flue gas, the removal efficiency of Hg⁰ is close to 100%. However, the average mercury removal efficiency reduces to 90.7% and 53.4% respectively after adding 0.2 mL/min and 0.4 mL/min SO₂, since the reaction of SO₂ and Fe₂O₃ produces Fe₂(SO₄)₃, leading to the deactivation of Fe₂O₃.
- sorbents,
- elemental mercury,
- flue gas,
- Fe/Al-SiO₂
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Removal of elemental mercury from flue gas by Fe/Al-SiO2 complex

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Removal of elemental mercury from flue gas by Fe/Al-SiO₂ complex