TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst support is a carbon nanotube-graphene composite. The weight ratio of the catalyst support and the carbon nanotubes is 2:1-1:2. The amount of titanium nitride is 70-80 pts. wt. of the total weight of the catalyst, where the titanium nitride is in the form of particles having a particle diameter of less than 8 nm. In the method, the solvent is ethanol and the nitrogen source is urea. The amount of titanium salts including titanium tetrachloride or titanium trichloride is 50-70 pts. wt. based on total weight of the catalyst (100 pts. wt.). In the method, the amount of nitrogen is 4-6 times the amount of the titanium (in moles). Preferred Method: The method further comprises drying the complex for 1-4 hours at 80-120 degrees C prior to the nitrogen sintering step. The step of preparing the mixed solution containing the catalyst support is carried out by performing sonication. In the method, the sintering step is performed for 3-5 hours. EXAMPLE - 47.5 mg Carbon nanotube was sonicated in 15 ml ethanol solution and stirred with 47.5 g graphene oxide for 30 minutes to obtain a mixed solution containing catalyst support. 1 g Titanium tetrachloride was stirred with 2.53 ml ethanol for 30 minutes to obtain titanium ethoxide solution. The obtained mixed solution containing catalyst support was mixed with the obtained titanium ethoxide solution, added with 1583 mg urea s nitrogen source and stirred for 30 minutes to obtain a solution containing the catalyst support combined titanium-urea complex. The obtained solution was dried in an oven at 100 degrees C for 1 hour, and transferred into an alumina vessel for nitrogen sintering at 750 degrees C for 3 hours to simultaneously convert titanium-urea complex into titanium nitride, and mixed solution containing catalyst support to carbon nanotube-graphene composite catalyst support to obtain titanium nitride supported carbon nanotube-graphene composite catalyst.