The method of producing hydrogen

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PROBLEM TO BE SOLVED : To provide a method of producing hydrogen capable of maintaining production of hydrogen and achieving excellent sulfur tolerance, even when a case where a sulfur content cannot be completely removed temporarily/continuously occurs due to decline in a function of a desulfurizing process, in steam-reforming reaction by a reforming catalyst for hydrogen production using a hydrogen source such as hydrocarbon as a material.SOLUTION : A method of producing hydrogen includes a process of obtaining hydrogen by reforming a hydrogen material including hydrocarbon compounds by a reforming catalyst for hydrogen production. The reforming catalyst for hydrogen production is a catalyst including : an inorganic complex oxide carrier containing alumina and supporting rare-earth metal oxide and alkaline-earth metal oxide; and nickel and platinum-group metal supported by the carrier. In the catalyst, the nickel and platinum-group metal are supported by the same carrier. Rhodium is included as the platinum-group metal. When line analysis measurement of the rhodium is performed in a carrier diametrical direction passing through a center of a catalyst cross section by using an electron probe microanalyzer, a rate of rhodium characteristic X-ray intensity detected in a range of a distance within 10% of a carrier diameter from a carrier outer surface relative to detected all rhodium characteristic X-ray intensity is 90% or more, and a rate of rhodium characteristic X-ray intensity detected in a range of a distance within 20% of the carrier diameter from the carrier outer surface is 95% or more. The method of producing hydrogen includes a period for reforming the hydrogen material in which a content concentration of a sulfur compound is 0.3 ppm or more in terms of sulfur atomic mass and/or a period for reforming the hydrogen material by the reforming catalyst for hydrogen production in which an integration amount of a supplied sulfur compound is 1 mg or more in terms of sulfur atomic mass per 1 g of the catalyst.