TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method (P1) further involves preparing Pd(0) nanoparticles colloidal suspension before its deposition on the Co(0) and inert material composition; catalytic activating of the Pd:Co supported on inert material composition obtained from the step of conditioning; and optionally, stabilizing the Pd:Co supported on inert material composition obtained from the step of conditioning by superficial oxidation. In the method (P1), the first step of Co reduction to Co(0) nanoparticles and its deposition consists of a decomposition of a Co compound in an organic solvent by adding a chemical reducing agent selected from a trialkyl-aluminum compound, Al(linear or branched 6-20C alkyl)3, in an atomic ratio of Co:Al is 2-20 at a temperature of 80-180 degrees C for a time of up to 20-24 hours in presence of one of inert material particles, the atomic ratio of Co and the metal of the inert material is at least 0.05; the second step of Pd(0) deposition on the Co(0) and inert material composition is performed by adding the Pd(0) nanoparticles suspended in an organic solvent to Co(0) and inert material composition in powder under stirring at room temperature for at least 3 hours, being the two metals in an atomic ratio Pd:Co is 1:10 to 1:0.1; the conditioning is obtained by treating the dry powder at a temperature of 250-450 degrees C under a hydrogen flow for at least 1 hours, hydrogen flow preceded and followed by argon fluxes for at least 20 minutes; the Pd(0) nanoparticles colloidal suspension are prepared by treating a Pd(II) compound in an organic solvent by adding a chemical reducing agent selected from a trialkyl-aluminum compound, Al(linear or branched 6-20C alkyl)3, in an atomic ratio Pd:Al of 0.1-3 at a temperature of 20-200 degrees C; the catalytic activation of the conditioned Pd:Co supported on inert material composition is obtained by annealing at a temperature of 500-1000 degrees C in an atmosphere consisting of a mixture of hydrogen and argon in a ratio of 1-20 vol.% of hydrogen and 99-80% of argon for a time of 1-6 hours; and the stabilization by superficial oxidation is obtained by treating the conditioned Pd:Co supported on inert material composition with oxygen (3.5 vol.%) in argon for 20 minutes at room temperature. Preferred Components: The atomic ratio of Co and the metal of the inert material is 0.05-0.20. The atomic ratio of Pd:Co is 1:3 to 1:1. The inert material used as support is subjected to a calcination and size reduction to obtain a material having a surface area Brunauer-Emmett-Teller (BET) is greater than 100 m2/g; total pore volume is greater than 0.8 cm3/g; average pore diameter is greater than 200 Angstrom and a size of at least 20-500 nm. Preferred Composition: The composition Pd:Co bimetallic nanoparticles are supported on an inert material, having weight ratio of nanoparticles of Co(0) deposited and the metal of the inert material is at least 0.05; an atomic ratio of Pd(0) and Co(0) is 1(Pd):10(Co) to 1(Pd):0.1(Co). The ratio from nanoparticles of Co(0) deposited and the metal of the inert material is 0.05-0.20 and the atomic ratio of Pd(0)-Co(0) is 1(Pd):3(Co) to 1(Pd):1(Co). The composition Pd:Co bimetallic nanoparticles are supported on an inert material having size of 1-100 nm. Preferred Catalyst: The catalytic device further comprises support of macroscopic dimensions of cordierite or ceramic material with honeycomb shape, supporting the composition. EXAMPLE - Alumina (13 g) was suspended in a mixture of toluene (90 ml) and n-octane (10 ml) and treated with ultrasound for 24 hours. The treatment was, then, interrupted to allow the precipitation of alumina in 4-5 hours. Then Co2(CO)8 (0.4 g) and toluene (150 ml) were added to the alumina (13 g) and the mixture was vigorously stirred for 2 hours. Palladium bis(acetoacetonate)(Pd(acac)2) (0.26 g) was suspended in toluene (50 ml). A suspension of Al(C8H17)3 (1.6 ml) in toluene (20 ml) was dropped into a suspension that was vigorously stirred. The yellow suspension was immediately transformed into a Pd(0) colloidal solution. The colloidal Pd(0) solution was added to the particles and stirred for 3 hours, then toluene was removed further to evaporation under high vacuum to form dark brown powder. The brown powder was placed in a porcelain boat and placed at 350 degrees C in a pre-heated oven. Initially, the material was conditioned under an argon flow, then under a hydrogen flow, then, once again, under an argon flow and followed by catalytic activation to form coated monolith.