Improvement of SO2 Resistance of Low-Temperature Mn-Based Denitration Catalysts by Fe Doping | Zendy

Jinyu Wang | Zendy; Zhaoguang Nie | Zendy; Zewen An | Zendy; Hongcun Bai | Zendy; Fengyin Wang | Zendy; Xiuli Zhang | Zendy; Yanhui Li | Zendy; Cuiping Wang | Zendy

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Improvement of SO₂ Resistance of Low-Temperature Mn-Based Denitration Catalysts by Fe Doping

Author(s) -

Jinyu Wang,

Zhaoguang Nie,

Zewen An,

Hongcun Bai,

Fengyin Wang,

Xiuli Zhang,

Yanhui Li,

Cuiping Wang

Publication year - 2019

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.9b00002

Subject(s) - catalysis , doping , inorganic chemistry , selective catalytic reduction , flue gas , chemistry , sulfate , ammonium sulfate , sulfation , nitrogen , materials science , chemical engineering , organic chemistry , optoelectronics , engineering , biochemistry

The influence of vapor and SO 2 in coal firing flue gas on the selective catalytic reduction activity of Mn/γ-Al 2 O 3 and Mn-Fe/γ-Al 2 O 3 catalysts was investigated at 150-275 °C. Denitration experiments and detailed characterization of catalysts were conducted. Vapor had no chemical effects on denitration, and the mechanism of SO 2 deactivating the Mn/γ-Al 2 O 3 catalysts was investigated in detail. This is due to the reaction between MnO 2 and SO 2 and the ammonium sulfate deposits forming on the surface. Sulfation of the Mn-active component was significantly reduced by doping the Mn/γ-Al 2 O 3 catalyst with Fe. Iron doping also lowered the stability of the ammonium sulfate surface deposits, forcing them to rapidly decompose. Thus, iron doping significantly improved SO 2 resistance and the denitration efficiency of Mn-Fe/γ-Al 2 O 3 catalysts was not clearly decreased.

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