Nippon Oil Corporation

Yasuyuki Iwasa

Takaya Matsumoto

Disclosed in a catalyst which enables to reduce the carbon monoxide concentration in a product gas to 5 ppm by volume or less when carbon monoxide in a raw material gas containing hydrogen and carbon monoxide is selectively oxidized. The catalyst comprises a support of an inorganic oxide and ruthenium loaded thereon, and the relative loading depth X(Ru) of ruthenium in the radial direction in a redial cross-section of the catalyst satisfies the requirement defined by the following formula (1)X(Ru)&#x2267;15&#x2003;&#x2003;(1).

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Yokohama, Japan

Yasuyuki Iwasa