Effects of hydrogen addition on the removal of nitric oxide by cyanuric acid
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Selective, non-catalytic techniques for removing nitric oxide (NO) from exhaust gases include the addition of cyanuric acid (CA) to the hot exhaust. This work examines the effects of hydrogen (H2) on the cyanuric acid-NO reduction process. Cyanuric acid was vaporized and mixed with a gas stream composed of N2, O2, H2 and NO in an electrically heated quartz flow reactor. The NO reduction and the products of the process were examined as a function of reactor temperature with a chemiluminescent NOx analyzer and a Fourier transform infrared (FTIR) spectrometer. Addition of H2 lowered the reactor temperature at which NO reduction occurred and increased both the quantity of NO removed and the temperature range over which NO reduction occurred. The effects of H2 on the process result from the oxidation of H2 and the generation of free-radicals that drive the NO reduction mechanism. Species observed in the exhaust stream of the reactor under various conditions included: H2O, CO2, CO, NO, N2O, HNCO, and CA. The quantity of each species depended on the reactor temperature and the input concentrations of H2, NO and CA. 1991 Combustion Institute.
