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Abstract
The decomposition rate of NO on the alumina surface is obtained by two different experimental methods in the temperature region of 920-1220°K. One is carried out by a laminar convective mass transfer experiment of the fuel lean combustion gas including various quantities of NO in a horizontal alumina pipe. The other is by an experiment of introducing such mixed gases as Ar-NO, Ar-NO-CO and Ar-NO-H2 flowing through a packed bed of alumina pebbles. First, the decomposition rate of NO is proved to be of zeroth order on the NO concentration when it is larger than about 300 ppm. However, in the case of NO concentration lower than about 300 ppm, all the reaction rates come to depend on the NO concentration. Secondly, the effect of the reducing species such as CO and H2 on the decomposition rate was studied by adding CO and H2 and, depending on the amount of CO and H2 included, the rate was seen to increase up to 3 to 12 times that in the case without these reducing species.