NOVELTY - A hydrogen-rich gas is produced by contacting a carbon monoxide-containing gas with a water gas shift catalyst in the presence of water at not less than 450 degrees C.    USE - For producing hydrogen-rich gas e.g. hydrogen-rich syngas for use as reactant feed in industrial applications including methanol synthesis, ammonia synthesis, oxoaldehyde synthesis from olefins, hydrogenations, and carbonylations.    ADVANTAGE - The method includes the use of catalyst that exhibits both high activity and selectivity to hydrogen generation and carbon monoxide oxidation.    DETAILED DESCRIPTION - Production of hydrogen-rich gas comprises contacting a carbon monoxide-containing gas with a water gas shift catalyst in the presence of water at not less than 450 degrees C. The water gas shift catalyst comprises platinum (Pt) and/or its oxides, iron (Fe) and/or rhodium (Rh) and/or its oxides, and sodium (Na), potassium (K), scandium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), vanadium (V), molybdenum (Mo), rhenium (Re), cobalt (Co), nickel (Ni), palladium (Pd), germanium (Ge), tin (Sn), antimony (Sb), lanthanum (La), cerium (Ce), praseodymium (Pr), samarium (Sm), or europium (Eu), or its salts.    An INDEPENDENT CLAIM is also included for a fuel processing system for generation of a hydrogen-rich gas from a hydrocarbon or substituted hydrocarbon fuel, comprising a fuel reformer, water gas shift reactor, and temperature controller. The fuel reformer converts a fuel reactant stream comprising a hydrocarbon or a substituted hydrocarbon fuel to a reformed product stream comprising carbon monoxide and water. The fuel reformer has an inlet for receiving the reactant stream, a reaction chamber for converting the reactant stream to the product stream, and an outlet for discharging the product stream. The water gas shift reactor effects a water gas shift reaction at less than 450 degrees C. The water gas shift reactor comprises an inlet for receiving a water gas shift feed stream comprising carbon monoxide and water from the product stream of the fuel reformer. The reaction chamber comprises a water gas shift catalyst. The water gas shift catalyst is effective for generating hydrogen and carbon dioxide from the water gas shift feed stream, and an outlet for discharging the resulting hydrogen-rich gas. The temperature controller maintains the temperature of the reaction chamber of the water gas shift reactor at a temperature of less than 450 degrees C.    DESCRIPTION OF DRAWING(S) - The drawing shows the effect of temperature on catalyst performance under water gas shift conditions.