TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Catalyst: The catalyst comprises platinum (0.3-5 wt.%).Preferred Method: The calcining in method (M1) is performed at 300-500degreesC for 1-12 hours. The reducing is performed at 150-500degreesC for 1-12 hours. The weight ratio of the platinum precursor (P1) and the transition metal precursor is adjusted such that the atomic ratio of the transition metal to platinum is 0.5-20.Preferred Components: The transition metal is selected from nickel, cobalt, copper and iron. The transition metal precursor is selected from Ni(NO3)2.6H2O, Co(NO3)2.6H2O, Cu(NO3)2.H2O and Fe(NO3)2.9H2O. (P1) is Pt(NH3)4(NO3)2.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Device: The fuel processor (P1) comprises a desulfurization device, at least one shift reaction device, and a preferential oxidation reaction (PROX) reaction device, and the catalyst is included in the PROX reaction device. The fuel cell system comprises a fuel cell stack and (P1) where (C1) is included in (P1). EXAMPLE - Catalyst (test) comprising tetramine platinum (II) nitrate (Pt(NH3)4(NO3)2) (0.207 g), iron (III) nitrate nona-hydrate (Fe(NO3)2.9H2O) (2.154 g) and gamma-alumina (10 g) were added to water (50 ml) and the mixture was stirred for 6 hours to prepare a uniform mixture. The mixture was dried at 60degreesC and dried at 110degreesC for 12 hours. The dried resultant was calcined at 350degreesC for 2 hours and reduced at 300degreesC for 2 hours in an oven under a hydrogen atmosphere to give Pt-Fe/gamma-alumina (Al2O3).    Similarly Pt-Ce/gamma-Al2O3 (comparative) was also prepared except that cesium nitrate hexahydrate (Ce(NO3)2.6H2O) (2.424 g) was used instead of (Fe(NO3)2.9H2O). Carbon monoxide oxidizing tests were performed by flowing gas which included (vol.%) carbon monoxide (1), oxygen (1), hydrogen (10), water vapor (2), and helium, at 333 Kelvin and for comparative it was done at 353 Kelvin. The result for test/comparative of carbon monoxide conversion (%) and oxygen selectivity was found to be 80/93 and 90/47 respectively.