Reactions of Isotopically Labeled Nitric Oxide (N15O) in a Gas Phase Corona Reactor

摘要

The chemical reactions of nitric oxide decomposition in a pulsed streamer corona discharge were studied through the use of isotopically labeled nitric oxide, N(15)O. Detection of the relative abundance of N(14)-N(14), N(15)- N(14), N(15)-N(15) and N(15)O using mass spectrometry indicate that decreasing the initial concentration of NO leads to less direct dissociation of N(15)O by the corona discharge in favor of direct dissociation of N(14)-N(14). It was found that even at a concentration of 5% NO in a nitrogen carrier gas, the ratio of N(2), formed from N(15) reacting with N(15) to that formed from N(15) reacting with N(14) was 0.3. These results are consistent with expectations from previous studies in the literature, however, the present study offers the potential for direct measurement of reaction pathways in the corona reactor to assess more accurately the magnitude of reaction rate constants and the relative importance of various reaction pathways.