Abstract
Perovskite-type oxide La 0.4Sr .6Mn 0.8Ni 0.2O 3 showed high activity for NO decomposition and thus was taken as the catalyst for investigation. Based on the ‘recycle’ mechanism of NO decomposition (NO 2 acts as an intermediate of O 2 formation) we reported recently, the kinetics of NO decomposition over La 0.4Sr .6Mn 0.8Ni 0.2O 3 was investigated. The NO decomposition rate was practically first-order for NO in the range 0.5–2.0 vol.% NO/He, while the reaction order varied from −0.24 to −0.08 for O 2 (0–6 vol.% O 2/He), depending on the temperature. The kinetics deduced from the ‘recycle’ mechanism accords well with that observed in practice by introducing the item K −6 ( K −7) 1/2 P NO ( P O 2 ) 1/2, which reflects the reciprocity of O 2 and NO in the reaction and is introduced in the kinetics for the first time. The rates and NO 2 dissociation equilibrium constants calculated from the practical reaction certified that NO 2 dissociation is indeed an important step of NO decomposition, and hence suggested that the ‘recycle’ mechanism is believable.
Published Version
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