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Selectivity of transition metal catalysts in promoting the oxidation of solid sulfites in flue gas desulfurization

Paper ID Volume ID Publish Year Pages File Format Full-Text
39078 45805 2015 9 PDF Available
Title
Selectivity of transition metal catalysts in promoting the oxidation of solid sulfites in flue gas desulfurization
Abstract

•We found the selective catalytic performance of Co2+ and Mn2+ in sulfite oxidation.•The features of the solid sulfites were characterized and compared.•We elucidate the selective catalytic behavior by the position-occupying hypothesis.

Wet flue gas desulfurization (WFGD) has been widely used to reduce the harmful effects of sulfur dioxide during coal combustion, of which sulfite is a byproduct. Recycling this desulfurization byproduct requires the oxidation of sulfite, and transition metals might considerably promote the sulfite oxidation rate. We compared the oxidation rates of four sulfites—sodium sulfite, ammonium sulfite, magnesium sulfite, and calcium sulfite—and found that transition metals have selective catalytic performance. Although each transition metal was confined to specific sulfites, Co2+ and Mn2+ were the most effective catalysts. In addition, the sensitivity levels of the sulfite oxidation rates to various transition metals were classified. The orders of the reactions of the four sulfites catalyzed by Co2+ and Mn2+ were calculated. Although both magnesium sulfite and calcium sulfite exist as solids, the oxidation rate of magnesium sulfite was considerably sensitive to Co2+. The same results were observed for sodium sulfite and ammonium sulfite. However, the oxidation rate of calcium sulfite was sensitive only to Mn2+. The properties of the two prepared solid samples, magnesium sulfite and calcium sulfite, were compared using X-ray diffraction, scanning electron microscopy, and particle size analysis. The position-occupying hypothesis was applied to determine the selective catalytic behaviors of transition metals for the oxidation of various sulfites by comparing the ionic potentials of the metals. The results provide an effective theoretical basis for catalyzing the sulfite oxidation in WFGD.

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Keywords
Sulfite; Oxidation rate; Selective; Catalyst; Desulfurization
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Selectivity of transition metal catalysts in promoting the oxidation of solid sulfites in flue gas desulfurization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 508, November 2015, Pages 52–60
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