Investigation of ultraviolet light-enhanced H2O2 oxidation of NOx emissions

    Authors

    C. D. Cooper; C. A. Clausen; L. Pettey; M. M. Collins;M. P. de Fernandez

    Comments

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    Abbreviated Journal Title

    J. Environ. Eng.-ASCE

    Keywords

    hydrogen peroxide; oxidation; nitrogen oxide; emissions; HYDROGEN-PEROXIDE; Engineering, Environmental; Engineering, Civil; Environmental Sciences

    Abstract

    Injecting aqueous solutions of hydrogen peroxide (14202) into hot flue gases can convert nitric oxide (NO) to higher oxidation states (NO2, HNO2, and HNO3), which can then be removed in a wet scrubber. The optimum temperature for such conversion is 500degreesC (930degreesF), at which H2O2 is thermally "activated" (split into free radicals). At lower temperatures ultraviolet (UV) light can be used to activate the peroxide molecules. In this pilot plant study at Kennedy Space Center, experiments were done with none, one, or two UV lamps on, with and without SO2 present in the flue gases, at various temperatures, and with various injection rates of peroxide. Temperatures ranged from 117 to 350degreesC (243 to 660degreesF), and the molar ratios (peroxide to NO,) ranged from 0.68 to 5.02. Conversions of NO varied from below 10 to above 70%, with the highest conversions occurring with higher temperatures, higher dosages of hydrogen peroxide, and with both UV lamps turned on. Conversions of NOx (NO+ NO2) varied from below 5 to above 40%. The presence of SO2 did not inhibit NO or NOx conversion.

    Journal Title

    Journal of Environmental Engineering-Asce

    Volume

    128

    Issue/Number

    1

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    68

    Last Page

    72

    WOS Identifier

    WOS:000173308300010

    ISSN

    0733-9372

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