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Multipollutant control of Hg/SO2/NO from coal-combustion flue gases using transition metal oxide-impregnated SCR catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
54032 46994 2015 8 PDF Available
Title
Multipollutant control of Hg/SO2/NO from coal-combustion flue gases using transition metal oxide-impregnated SCR catalysts
Abstract

•The total surface area of SCR catalyst was increased after surface treatment.•V4+/V5+, Mn4+, and Cu2+ existed in VOx-, MnOx-, and CuOx-impregnated catalysts.•Hg0 oxidation and SO2/NO reduction were enhanced after surface treatment.•Potential SO2–SO3 conversion due to metal oxide impregnation should be concerned.•L–H model explained the Hg0 oxidation of VOx- and MnOx-impregnated catalysts.

This research investigated the effects of transition metal oxide impregnation on the physical/chemical properties and the multipollutant (i.e., Hg/SO2/NO) control of a V2O5-WO3/TiO2-SiO2 selective catalytic reduction (SCR) catalyst. Additional V, Mn, and Cu of 5 wt% as their precursor metal hydroxides were impregnated onto the catalyst surface. The impregnated metal oxides presenting in nanoscales caused an increase in total surface area of catalysts. SEM images suggested that the raw and treated catalysts presenting as bean-shaped nanoparticles within 10–30 nm. V4+/V5+, Mn4+, and Cu2+ were the major valence states presenting on the surface of VOx-, MnOx-, and CuOx-impregnated catalysts, respectively. Hg0 oxidation, SO2 removal, and NO reduction of the SCR catalyst can be enhanced after the metal oxide impregnation. VOx- and CuOx-impregnated catalysts had not only excellent Hg0 oxidation but also great NO reduction. However, the increase in SO2 removal after metal oxide impregnation, assumed to be partly caused from enhancing SO2–SO3 conversion, may be of concern considering the potential downstream corrosion. Langmuir–Hinshelwood model can successfully explain the Hg0 oxidation by VOx- and MnOx-impregnated catalysts. Overall, multipollutant emission control using surface-impregnated SCR catalysts can be practically applied at 350 °C under the tested coal-combustion flue gas condition.

Graphical abstractHg0 oxidation as well as SO2/NO removal of V2O5-WO3/TiO2-SiO2 SCR catalyst can be enhanced after metal oxide impregnation. Flue gas components showed great influences in Hg0 oxidation.Figure optionsDownload full-size imageDownload high-quality image (148 K)Download as PowerPoint slide

Keywords
Multipollutant; Metal oxide; Elementary mercury; Coal-combustion
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Multipollutant control of Hg/SO2/NO from coal-combustion flue gases using transition metal oxide-impregnated SCR catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 245, 1 May 2015, Pages 2–9
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us