TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Preparation of the catalyst involves: adding carbon material and metal oxide doped with nitrogen into an organic solvent with reductive ability to form a mixture; mixing the mixture well; adding precursor of noble nano-metal particle into the mixture; heating the mixture containing the precursor of the noble nano-metal particle to make precursor reduce to a noble nano-metal particle; and removing the organic solvent. Preferred Components: The carrier material is made in a shape of particle, tube, star, or layer (preferably tube). The oxide is SiO2, Al2O3, TiO2, ZrO2, mesoporous structure metal oxide, and/or microporous structure metal oxide (preferably TiO2, SiO2, or Al2O3. The oxide (preferably TiO2) and the carrier material are mixed in 1-99 (preferably 20-50) wt.% of the oxide and the carrier material. The atomic mole ratio of nitrogen is 6-10 wt.% of the oxide. The carrier is single-walled nanotube, multi-walled nanotube, acetylene black, mesocarbon microbeads or mesoporous carbon. The at least one noble nano-metal particle is 5-50 (preferably 20) wt.% of the oxide and the carrier material. A diameter of the noble nano-metal particle is less than 20 nanometer. The noble nano-metal particle is a single kind of metal particle, an alloy made of two kinds of metal particles or an alloy made of multiple metal particles. Preferred Method: The heating mixture is provided as a recurrent flow heating method or a microwave heating method.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic solvent is polyacetals, acids or aldehydes (preferably polyacetal selected from ethanol, ethylene glycol, glycerin or butanediol). EXAMPLE - TiO2 (TX20) (20 wt.%) was mixed with 10 M NaOH solution and mechanically stirred in an oil bath pan at 110 degrees C for 72 hours. Subsequently, the mixture was washed with alternate HCl and deionized water to pH of 7 by filtration. Lastly, the mixture was dried in dry oven at 80 degrees C to form TiO2 nanotubes (TNT) support. Obtained TNT support (50 wt.%) was added into ethylene glycol solution (25 ml) which is served as the solvent and reductant. After adding adequate 0.05 M chloroplatinic acid solution (H2PtCl6 in ethylene glycol) and 0.05 M ruthenium chloride solution (RuCl3 in ethylene glycol) into the solvent and mixing evenly, the reductive reaction was performed with microwave heating method. After the reduction, the mixed solution was stirred for cooling and washed repeatedly with deionized water for removing chlorine ions (Cl-), and finally a dried to form TX20-PtRu20 catalyst having electrochemical surface area of 53.18 cm2/g.