| abstract |
To provide a catalyst capable of efficiently decomposing and removing nitrous oxide contained in exhaust gas even in a low temperature range of 300 ° C. or lower. A nitrous oxide decomposition catalyst comprising cobalt oxide containing cobalt trioxide (Co 3 O 4 ) as a main component and an alkali metal and / or alkaline earth metal, and nitrous oxide using the catalyst. A decomposition method, and a) a cobalt salt, b) an oxide of the cobalt salt, and c) a precipitate formed by preparing at least one of a water-soluble cobalt salt and an alkaline substance in an aqueous solution and then mixing them. A method for producing a nitrous oxide decomposition catalyst, comprising adding an alkali metal salt and / or an alkaline earth metal salt by impregnation to at least one selected from the group consisting of: drying, and calcining. [Selection] Figure 1 |