A method of decomposing ammonia and ammonia decomposition catalyst regeneration method

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PROBLEM TO BE SOLVED : To provide an ammonia decomposing catalyst the catalytic performance of which can be regenerated again when it is deteriorated by being used in an ammonia decomposition reaction.SOLUTION : The ammonia decomposing catalyst includes an oxide of at least one element (A component) selected from the group consisting of rare earth, alkali metal, and alkaline earth metal elements and fine metal particles of at least one element (B component) selected from the group consisting of Co, Ni, and Fe and is obtained by reducing an oxide having a perovskite structure formed from the A and B components.