Study on the Oxidation Effects of Commercial SCR Catalyst on Elemental Mercury (Hg0)

doi:10.11930/j.issn.1004-9649.201806025

Abstract

Abstract: In order to develop a novel integrated catalyst with better joint removal effects on various pollutants such as NO_x and mercury in the flue gas, the oxidation effects of commercial SCR denitration catalyst on elemental mercury (Hg⁰) and its influencing factors were studied in this paper. The oxidation reaction mechanism of Hg⁰ was also explored. The experimental results show that the SCR catalyst has some certain oxidation effects on Hg⁰ in flue gas. However, its maximum oxidation efficiency on Hg⁰ is still below 50% even at the optimum reaction temperature of 250~300 ℃. In the presence of low concentration of NO and 5% O₂, the catalyst has a relatively high oxidation efficiency for Hg⁰. While in the presence of SO₂, the oxidation of Hg⁰ was apparently inhibited, and the toxicity of SO₂ to the catalyst was basically irreversible. Moreover, there exists a competitive relationship between NH₃ and Hg⁰ in the adsorption process. So the presence of NH₃ reduces the oxidation efficiency of Hg⁰ by the catalyst. It also appears that the presence of H₂O has significant negative impact on the oxidation of Hg⁰.

Key words: coal-fired power plants, flue gas denitration, SCR catalyst, elemental mercury (Hg⁰), oxidation efficiency of Hg⁰

CLC Number:

X511
TM621.9

QU Litao, LI Caiting, TAO Li. Study on the Oxidation Effects of Commercial SCR Catalyst on Elemental Mercury (Hg⁰)[J]. Electric Power, 2019, 52(4): 151-155,160.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201806025

https://www.electricpower.com.cn/EN/Y2019/V52/I4/151

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Study on the Oxidation Effects of Commercial SCR Catalyst on Elemental Mercury (Hg⁰)

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