To provide a catalyst prevented from discharging carbon dioxide to the utmost and capable of producing hydrogen and a carbon material extremely reduced in the content of the catalyst and a method excellent in ion absorbing. releasing characteristic and for producing hydrogen and a carbon material using the catalyst in a catalytic decomposition reaction of hydrocarbon.
The hydrocarbon catalytically decomposing catalyst is constituted of nickel and at least one kind of rare earth oxide and the grade of nickel is ≥75 wt.% and <100 wt.% expressed in terms of pure metal. The producing method of hydrogen and carbon is by allowing a gas constituting essentially of hydrocarbon kept at ≥450°C and ≤600°C to contact with a catalyst layer formed by using the catalyst.
SUGIYAMA MASASHI
SUGANO TAIJI
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