Kinetic and Electron Paramagnetic Resonance Studies of Photochemical Reactions of Gas Mixtures of Methane, Ammonia and Water

Article abstract of DOI:10.1039/ft9908602565

Photoactivation of methane has been kinetically studied in the CH4-NH3-H2O mixture, and the radical intermediates measured by the spin trap (PBN, α-phenyl-N-tert-butylnitrone)-EPR method.The trapped radicals were CH3O^. (a^N = 1.35, a_β^H = 0.20 mT), ^.CH2NH2 (a^N = 1.46, a_β^H = 0.26 mT), and ^.CH=NH (a^N = 1.48, a_β^H = 0.62 mT).It was suggested that ^.CH2NH2 was mainly provided by H abstraction from methylamine and the photolysis of CH3NH2 to CH3NH^. and ^.CH2NH2 was low.The coupling of ^.CH2NH2 led to the formation of ethylenediamine, while CH3NH^. decayed to CH2=NH from which the ^.CH=NH radical was generated by the H elimination.The water photolysis proceeded with a quantum yield of 0.06 in the gas mixture.

Full text of DOI:10.1039/ft9908602565

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