Abstract
In situinfrared observation during the reduction of NO by CH4over Co–ZSM-5 reveals the presence of CN species. The reactivity of these species has been probed by exposing them to NO2, O2, or NO while monitoring their rate of disappearance. In a complementary set of experiments, mass spectrometry was used to identify the reaction products as N2and CO2. At 450°C the rate coefficients for the consumption of CN are 8.5×10−5, 1.9×10−6, and 3.3× 10−7s−1ppm−1for reaction in NO2, O2, and NO, respectively. The reactivity of CN is sufficiently high for these species to be considered reaction intermediates in the formation of N2and CO2during the reduction of NO by CH4in the presence of O2.
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