Patent ID: 7919424

Claim:
A method of preparing a platinum-based catalyst for oxidation/reduction reactions, which comprises the steps of: (A) impregnating a catalyst composition comprising (i) a water-soluble salt of at least one metal selected from among cerium (Ce), zirconium (Zr) and rhenium (Re), (ii) a water-soluble platinum salt, and (iii) a C2-C10 alkylene oxide and (iv) water, on a support comprising at least one selected from alumina, silica and titania, (B) drying the resultant impregnated catalyst composition, and (C) calcining the impregnated catalyst composition, wherein the catalyst composition comprises the alkylene oxide in an amount corresponding to 0.5-10 times a sum of values obtained by multiplying the number of moles of each cationic species present in the catalyst composition by the oxidation number of the cationic species.