TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Preparation of the composite catalyst comprises: (a) preparing a solution of graphene oxide in water; (b) preparing a solution of the metal oxide precursor in a solvent miscible with water; (c) mixing the solutions prepared in steps (a) and (b) in desired proportion; (d) precipitating the solution obtained in step (c) by adding a basic solution, preferably ammonia; (e) reducing the graphene oxide by adding a reducing agent (preferably hydrazine), and heating the suspension at a convenient temperature and sufficient time to obtain a constant change of color of graphene (where the heating conditions can change according to the time and temperature of the process, e.g. the constant change of color at temperatures higher than 30 degrees C for more than 2 hours, preferably at 90 degrees C for 12 hours); and (f) filtering and washing of the precipitate. Preferred Components: The graphene platelets are composed of single or multiple layers of graphene. The thickness of the graphene platelets are less than 500 nm, preferably 0.4-50 nm. The nanoparticles of metal oxide: are of 1-100 nm; and includes titanium dioxide, zinc oxide, zirconium dioxide, ferric oxide, tungsten trioxide, strontium titanate, barium titanate, niobium pentoxide, potassium tantalum oxide, tin dioxide, tantalum pentoxide, aluminum oxide, yttrium oxide and/or cerium(IV) oxide. The metal oxide is: amorphous, semicrystalline or crystalline; and in the oxyhydrate and/or hydrate form. The doping or decorating material is platinum, palladium, nickel, copper, iron, rhodium, ruthenium, nitrogen and/or carbon. The composite catalyst has a surface area of 40-500 (preferably 60-250) m2/g. In the composite catalyst, the graphene is present at 0.01-2 wt.%, preferably 0.1-1 wt.%. Preferred Process: The process comprises an additional step of calcination under non-oxidant atmosphere, where the non-oxidant atmosphere is an inert gas, ammonia, hydrazine or hydrocarbons at more than 400 degrees C, preferably at 450 degrees C for 2 hours. EXAMPLE - Titanium tetrachloride (6 g) was added dropwise under strong stirring into 4% solution of hydrochloric acid. The stirring was continued until the solution was clear. Then graphene oxide solution (7 g) was added and the solution stirred for another 30 minutes. Then ammonia (28-30%) was added dropwise until the pH was 7. Then the graphene oxide was reduced by adding hydrazine (3 g) and allowed to react overnight at 90 degrees C. The obtained titanium dioxide graphene (composite catalyst) was filtered and washed with water until no chloride was detected and dried at 90 degrees C overnight. Then the composite catalyst was calcinated at 450 degrees C for 2 hours under nitrogen with heating rate of 2 degrees C/minute.