Supported Manganese Dioxide Catalyst for Seawater Flue Gas Desulfurization Application

Jun Jie Bian; Xin Min; Shu Zhang; Chun Hu Li

doi:10.4028/www.scientific.net/AMR.236-238.964

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Supported Manganese Dioxide Catalyst for Seawater Flue Gas Desulfurization Application
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 236-238Supported Manganese Dioxide Catalyst for Seawater...

Supported Manganese Dioxide Catalyst for Seawater Flue Gas Desulfurization Application

Abstract:

Ceramic-supported manganese dioxide catalyst, MnO2-ceramic, prepared by impregnation- precipitation method and calcined at 350 degree C, was exposed to flue gases to investigate the catalytic oxidation of sulphur dioxide in flue gas at seawater buffering system. The results showed that compared with acid treated ceramic, MnO₂-ceramic gained 2%-46% higher Desulfurization efficiency in temperature range of 15-75 degree C. MnO₂-ceramic exhibited 57% desulfurization efficiency at its favorable temperature (60 degree C) while ceramic showed 11% Desulfurization efficiency at 60 degree C. MnO₂-ceramic was found to catalyze S(IV)oxidation even at low pH (pH<4) while the reaction rate of noncatalytic S(IV) oxidation is negligible under the identical conditions. No catalytic activity decay was observed after 40 hours’ run. XPS reveals that the Mn was in the oxidation state of +4 for the MnO_x-ceramic. SEM-EDS and XRD indicated that the good catalytic activity of MnO₂-ceramic at low temperature could be attributed to high dispersion of MnO₂ on ceramic support. The high performance of MnO₂-ceramic on the SO₂ removal appeared to be promising in the seawater flue gas desulfurization industrial application when high sulfur coals were burned.