Title

Investigation of ultraviolet light-enhanced H2O2 oxidation of NOx emissions

Authors

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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