Oxidation efficiency of elemental mercury in flue gas by SCR De-NO<sub><em>x</em></sub> catalysts

LI Jian-rong; HE Chi; SHANG Xue-song; CHEN Jin-sheng; YU Xiao-wei; YAO Yuan-jun

Volume 40 Issue 02

Feb. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(02): 241-246

LI Jian-rong, HE Chi, SHANG Xue-song, CHEN Jin-sheng, YU Xiao-wei, YAO Yuan-jun. Oxidation efficiency of elemental mercury in flue gas by SCR De-NOx catalysts[J]. Journal of Fuel Chemistry and Technology, 2012, 40(02): 241-246.

Citation:

LI Jian-rong, HE Chi, SHANG Xue-song, CHEN Jin-sheng, YU Xiao-wei, YAO Yuan-jun. Oxidation efficiency of elemental mercury in flue gas by SCR De-NO_x catalysts[J]. Journal of Fuel Chemistry and Technology, 2012, 40(02): 241-246.

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Oxidation efficiency of elemental mercury in flue gas by SCR De-NO_x catalysts

1.
Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;
2.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2011-08-31
Rev Recd Date: 2011-11-28
Publish Date: 2012-02-29

Abstract

Abstract

The oxidation efficiency of elemental mercury (Hg⁰) by fresh and 40 000 h SCR (Selective Catalytic Reduction) catalysts was studied with the help of simulated experiments under oxidation and SCR conditions, respectively. The structural and textural properties of the catalysts were characterized by various techniques, including N₂ adsorption/desorption, SEM-EDS, FT-IR, and ion chromatography. It was found that the Hg⁰ oxidation efficiency over the 40 000 h catalyst is about 5%~20% lower than that of the fresh one under the oxidation condition (with HCl and O₂), whereas it just decreases by about 5%~10% under the SCR condition (when NH₃ and NO are added). The particles agglomeration phenomenon was observed for the 40 000 h catalyst, of which the BET, V content, and V⁵⁺ = O quantity decrease to some extent. The contents of the water-soluble ions (such as Na⁺, K⁺, NH₄⁺, and SO₄^2-) of the 40 000 h catalyst are higher than those of the fresh one. All these factors have a negative influence on the pore structure and active sites distribution over the 40 000 h catalyst, thereby reducing its Hg⁰ oxidation efficiency.
- SCR,
- de-NO_x catalyst,
- flue gas,
- elemental mercury,
- oxidation efficiency

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References(19)

References

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