Development of Highly Efficient Cobalt-based Catalyst for Direct Decomposition of Nitrous Oxide

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Alkali-doped Co_3O_4 catalysts were developed for direct decomposition of N_2O in the presence of O_2. The catalysts can be prepared by the precipitation method ; however, activity of the catalyst strongly depended on the crystal structure of the precipitate. It was found that the amount of alkali adsorbed on or occluded in the precursor determines the activity of the catalyst formed by calcination of the precursor. Effects of the alkali component on the catalyst activity was also examine and it was found that the alkali component facilitates the reduction of Co(III) species and thus facilitates the desorption of oxygen atoms formed by decomposition of N_2O. The effect of carbon dioxide in the feed gas upon the catalyst activity was examined, and it was found that CO_2 is strongly adsorbed on the catalyst and disturbs the activity of the catalyst.