Interaction of iron atoms with molecular oxygen
The results of experimental and theoretical studies of the interaction of iron atoms with molecular oxygen are presented. It was demonstrated that the reaction simultaneously proceeds through two channels, a recombination one, with the formation of FeO2, and an exchange one, with the formation of FeO+O. The rate constants of these reactions, as well as that of the thermal dissociation of FeO2 were determined. Under the assumption that all the reaction proceed via the long-lived complex FeO2*, an analysis of these processes was performed within the framework of the RRKM theory. An examination of the available thermochemical and kinetic data made it possible to estimate the rate constants for some reactions involving the higher iron oxides, FeO3 и FeO4.
Представлены результаты экспериментально-теоретического исследования взаимодействия атомов железа с молекулярным кислородом. Показано, что реакция протекает одновременно по двум каналам − рекомбинационному − с образованием FeO2 − и обменному, с образованием FeO+O. Измерены константы скорости реакции для этих каналов, а также константа скорости термической диссоциации FeO2. В предположении, что все реакции протекают через долгоживущий комплекс FeO2*, проведен анализ этих процессов в рамках теории РРКМ. На основе термохимических и кинетических данных, представленных в литературе, оценены константы скорости некоторых реакций с участием высших окислов железа FeO3 и FeO4.
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