TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Component: The first hydride heat exchanger is disposed so that the reactant stream may again pass through the first hydride heat exchanger after passing through the second water gas shift reactor. The first and second water gas shift reactors have more than one water gas shift catalyst. The first hydride heat exchanger has more than one metal hydride. The first and second water gas shift catalyst is selected so that an operational temperature of the first and second water gas shift catalysts and hydridable temperatures of the first and second metal hydrides are approximately equal. The carbon monoxide clean-up system further includes second hydride heat exchanger (23) having a second metal hydride, third water gas shift reactor having water gas shift catalyst, fuel cell stack provided with a source of hydrogen gas, fuel processing system for providing the hydrogen gas, and vehicle body. The fuel processing system has primary reactor and carbon monoxide clean-up system. The third water gas shift catalyst is selected so that an operational temperature of the third water gas shift catalyst and hydridable temperature of the first and second metal hydrides are approximately equal. The primary reactor is disposed to provide a reactant stream having hydrogen and carbon monoxide to the carbon monoxide clean-up system.Preferred Process: The first hydride heat exchanger is configured so that the metal hydride becomes fully hydrided with the hydrogen upon passing the reactant stream through the first hydride heat exchanger subsequent to passing the reactant stream through the first water gas shift reactor. The reactant stream is cooled prior to passing through the first hydride heat exchanger after passing through the first water gas shift reactor. It is heated prior to passing through the first hydride heat exchanger subsequent to passing through the second water gas shift reactor. The reactant stream has a temperature and partial pressure of hydrogen after passing through the first water gas shift reactor. The first metal hydride becomes hydrided at the temperature and partial pressure of hydrogen of the reactant stream when the reactant stream passes through the first hydride heat exchanger after passing through the first water gas shift reactor. The first metal hydride is dehydrided at temperature between 250-450degreesC.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The first metal hydride is metal hydrides containing titanium, magnesium, and/or palladium; metal hydrides of the di-magnesium-nickel family; or platinum group metal doped metal hydride. The first and second water gas shift catalysts comprise copper-zinc-aluminum based catalysts or platinum/cerium based catalysts.