TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: The mixture of molecular oxygen, fuel and water is contacted with a catalyst at 400degreesC or more, in fuel processor to produce hydrogen rich gas. Molecular oxygen is supplied to fuel processor as a mixture of gases comprising nitrogen and molecular oxygen. The hydrogen rich gas exiting the reforming portion is maintained at 100-900degreesC, preferably 400-700degreesC. The hydrogen rich gas comprising carbon monoxide and carbon dioxide, is contacted with another catalyst which effectively converts carbon monoxide and water into carbon dioxide and hydrogen, to produce a second gas further enriched in hydrogen and having reduced level of carbon monoxide.Preferred Ratio: The molar ratio of oxygen supplied to the fuel processor per mole of fuel is x0-1.5x0 or 0.95-1.2x0, and the molar ratio of water supplied to the fuel processor per mole of fuel is 0.8(2n-2x-p) to 2.0(2n-2x-p), preferably 1.0(2n-2x-p) to 1.1(2n-2x-p).    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Catalyst: The catalyst comprises a transition metal and an oxide conducting portion. The oxide conducting portion is ceramic oxide chosen from the group of crystallizing in the fluorite structure and/or lanthanum-gadolinium oxide (LaGaO3). The catalyst is chosen from autothermally reforming catalysts that operate at 100-700degreesC. The second catalyst comprises transition metal on cerium oxide or ceria doped with a rare earth or an alkaline earth element. The transition metal is chosen from platinum, palladium, ruthenium, rhodium, iridium, iron, cobalt, nickel, copper, silver and/or gold. The rare earth element is gadolinium, samarium, yttrium, lanthanum and/or praseodymium. The alkaline earth metal is magnesium, calcium, strontium and/or barium. SPECIFIC COMPOUNDS - The fuel is methane, methanol, ethane, ethylene, ethanol, propane, propene, i-propanol, n-propanol, butane, butene, butanol, pentane, pentene, hexane, cyclohexane, cyclopentane, benzene, toluene, xylene, natural gas, liquefied petroleum gas, isooctane, gasoline, kerosene or diesel.    EXAMPLE - Methane, water and oxygen were contacted with catalyst at 690degreesC. The molar ratio of oxygen to methane and water to methane, were set to 0.5 and 1.8, respectively. The hydrogen rich gas was found to contain 70% of hydrogen, 14% of carbon monoxide and 16% of carbon dioxide. The efficiency of the fuel conversion, was 96.3%.