CARBON-SUPPORTED CATALYST

摘要

A carbon-supported catalyst which has more excellent catalyst performance than that of a conventional catalyst is provided. A carbon-supported catalyst provided with palladium-containing particles, catalyst microparticles which cover the palladium-containing particles and which have a platinum-containing outermost layer, and a carbon carrier on which the catalyst microparticles are supported, characterized in that: the carbon-supported catalyst is produced through (1) preparing a carbon carrier on which the palladium-containing particles are supported, (2) depositing a copper monoatomic layer on the palladium-containing particles by a copper underpotential deposition method, and (3) replacing the copper monoatomic layer by the platinum-containing outermost layer, and thus synthesizing the catalyst microparticles; and on a titration curve obtained by a potentiometric titration method which comprises dropping an acid solution to a mixture of the carbon-supported catalyst and an alkali solution and measuring the electrical potential, the change in the potential versus the amount of the acid solution dropped is 0.8 (dV/d(mL/m2)) or more in a range wherein the potential is 0.095 to 0.105V (vs. Ag/AgCl).