TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The nanoparticles of palladium and gold are present on the surface of the macropores of the monolith. The size of the metal M nanoparticles can vary from 1-300 nm. The metal salt is palladium chloride, potassium tetrachloroaurate and hydrogenotetrachloroaurate. The metal M salt concentration in the impregnation solution is 103-1 M. The hydrides of formula (I) are preferably lithium borohydride. The solvent of the metal hydride solution is methyltertiobutylether. The micropores contain hydrogen as a metal hydride crystalline, semi-crystalline or amorphous hydrides (I). The specific surface of the composite material is 50-900 m2. The micropore volume is greater than or equal to 0.30 cm3/g; and the composite monolith and the metal hydride (I) are in amorphous form. Preferred Method: In step (iii), the heat treatment is performed in the presence of hydrogen at 400 degrees C for 1 hour. The degassing of the material is performed at 280-320 degrees C. The heating of composite material is performed at 250-400 degrees C. The step (ii) includes carrying out re-hydrogenation of composite material under hydrogen pressure of 100 bar at 400 degrees C for 12-24 hours. EXAMPLE - Graphitized carbon monoliths (MS25carb) were immersed in a beaker containing a palladium chloride solution in acetone/water (1: 1; v: v), acidified by 0.5 ml of hydrochloric acid. The beaker was then placed under dynamic vacuum until no effervescence in order to ensure good impregnation of the palladium chloride solution in porous monoliths and left under static vacuum for 3 days. The monoliths were then dried in air, then the palladium chloride was reduced by heat treatment of the monolith at 400 degrees C under hydrogen to obtain composite monoliths with palladium nanoparticles (PdMS25carb). MS25carb monoliths were immersed in a beaker containing potassium tetrachloroaurate solution in acetone/water. The beaker was then placed under dynamic vacuum until no effervescence in order to ensure good impregnation of the potassium tetrachloroaurate solution in porous monoliths and left under static vacuum for 3 days. The monoliths were then dried in air and then the gold ions potassium tetrachloroaurate were reduced by thermal treatment monoliths at 80 degrees C under hydrogen pressure of 8 bars to obtain composite monoliths with gold nanoparticles (AuMS25carb).