NOVELTY - Production of hydrogen-rich gas comprises contacting a carbon monoxide-containing gas with a water gas shift (WGS) catalyst in the presence of water at not more than 450degreesC. The WGS catalyst comprises rhodium, nickel, platinum and/or their oxides; copper, silver, gold, and/or their oxides; potassium, cesium, scandium, yttrium, titanium, zirconium, vanadium, molybdenum, rhenium, iron, ruthenium, cobalt, iridium, palladium, and/or their oxides.    USE - For producing a hydrogen-rich gas, e.g. hydrogen-rich syngas useful, e.g. in methanol synthesis, ammonia synthesis, oxoaldehyde synthesis from olefins, hydrogenation and carbonylation.    ADVANTAGE - The catalyst 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 (WGS) catalyst in the presence of water at not more than 450degreesC. The WGS catalyst comprises rhodium, nickel, platinum and/or their oxides; copper, silver, gold, and/or their oxides; potassium, cesium, scandium, yttrium, titanium, zirconium, vanadium, molybdenum, rhenium, iron, ruthenium, cobalt, iridium, palladium, cadmium, indium, germanium, tin, lead, tin, tellurium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, and/or their oxides.    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 for converting 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 having 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; water gas shift reactor for effecting a water gas shift reaction at less than 450degreesC, and comprising an inlet for receiving a WGS feed stream comprising CO and water from the product stream of the fuel reformer, a reaction chamber comprising a water gas shift catalyst for generating hydrogen and carbon dioxide from the water gas shift feed stream, and an outlet for discharging the hydrogen-rich gas; and temperature controller for maintaining the temperature of the reaction chamber of the WGS reactor at less than 450degreesC.    DESCRIPTION OF DRAWING(S) - The figure illustrates the effect of temperature on catalyst performance under WGS conditions.