Experimental Study on H2O2 Wet Denitration Catalyzed by Fe2O3 With Different Crystal Forms

doi:10.12096/j.2096-4528.pgt.20069

Abstract

Abstract:

The process of oxidative absorption of NO by Fenton-like reagents using α-Fe₂O₃, β-Fe₂O₃ and γ-Fe₂O₃ as catalysts was studied, and the impact mechanisms of crystal structure and surface property of three Fe₂O₃ on the NO removal efficiency were also analyzed. It is found that the denitration performance of γ-Fe₂O₃ is the best and the NO removal efficiency could reach 87.5% with the H₂O₂ concentration of 1.5 mol/L, catalyst concentration of 20 mmol/L, pH value of 5 and reaction temperature of 55℃. The mechanism investigation indicates that the reactions of H₂O₂ decomposition catalyzed by three Fe₂O₃ for NO removal occur on the surface of catalysts, the redox cycle exists in the reaction process and the main product of H₂O₂ decomposition is ·OH. Activity difference analysis indicates that the influence of crystal structure and surface property of Fe₂O₃ on the NO removal is obvious. The highest activity of γ-Fe₂O₃ can be attributed to its large specific surface area, high dispersion and abundant Fe²⁺ on the surface and the activity of β-Fe₂O₃ is higher than α-Fe₂O₃ due to more oxygen vacancies on the surface.

Key words: wet denitration, Fe₂O₃, NO, H₂O₂, oxygen vacancies

CLC Number:

X773
TK16

Yang QIN,Weiguo PAN,Ruitang GUO,Deyu GUO,Zhongwei ZHANG,Qi ZHOU. Experimental Study on H₂O₂ Wet Denitration Catalyzed by Fe₂O₃ With Different Crystal Forms[J]. Power Generation Technology, 2020, 41(5): 480-488.

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Experimental Study on H₂O₂ Wet Denitration Catalyzed by Fe₂O₃ With Different Crystal Forms

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