Hydrocarbon-reforming catalyst and a method of manufacturing thereof

A hydrocarbon-reforming catalyst, comprising:

• a porous carrier body, formed from at least one oxide powder selected from the group consisting of magnesia, alumina, zirconia, titania and calcia;
• and
• catalytic-activity particles, distributed on the surface of the porous carrier body, wherein 80% or more of the catalytic-activity particles are 3.5 nm or less in size,
• the catalytic-activity particles are produced by activating an oxidized catalytic-activity constituent, which is distributed in a complex oxide;
• the complex oxide comprises (i) at least one catalytic-activity constituent selected from the group consisting of salts or compounds of at least one of Ni and Co, and (ii) at least one carrier-forming constituent selected from the group consisting of salts or compounds of at least one of Mg, Al, Zr, Ti and Ca;
• and
• the complex oxide is formed by impregnating both the catalytic-activity constituent and the carrier-forming constituent on the surface of the porous carrier body, and calcinating the porous carrier body having the catalytic-activity constituent and the carrier-forming constituent.