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 degreesC. The water gas shift catalyst comprises platinum and/or its oxides, ruthenium and/or its oxides, and specified metal elements, or its salts.    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 inventive 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 degreesC. The water gas shift catalyst comprises platinum and/or its oxides, ruthenium and/or its oxides, and lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium, barium, scandium, yttrium, titanium, zirconium, vanadium, molybdenum, manganese, iron, cobalt, rhodium, iridium, germanium, tin, antimony, lanthanum, cerium, praseodymium, samarium, or europium 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 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. It has an inlet for receiving the reactant stream, reaction chamber for converting the reactant stream to the product stream, and outlet for discharging the product stream. The water gas shift reactor effects a water gas shift reaction at a temperature of less than 450 degreesC. 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, a reaction chamber comprising a water gas shift catalyst selected from any one of the catalysts. The water gas shift catalyst being 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 degreesC.    DESCRIPTION OF DRAWING(S) - The drawing shows a the effect of temperature on catalyst performance under water shift catalyst conditions.