ROLE OF N-CONTAINING SURFACE SPECIES ON NO REDUCTION BY CARBON

In order to understand the mechanism of C-NO reaction, the detailed ma terial balance was established by analyzing all the gas species produc ed during the reaction with mass spectroscopy and gas chromatography. The amount of nitrogen-containing surface species was estimated in the temperature range between 600 and 950 degrees C and with NO concentra tion of, mainly, 540 ppm. Then the effect of surface species on the re action rate was examined. The step response experiments were carried o ut by switching the feed gas from (NO)-N-14-O-16 to (NO)-N-15-O-18. Th e results reveal not only the reaction mechanism but also the depletio n rate of surface nitrogen species during the experiment. N-2 formatio n rate was correlated with NO concentration and the amount of surface nitrogen species. It is concluded that N-2 is mainly formed by the fir st-order reaction between C(N) and NO.