TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The fuel inlet stream comprises a hydrocarbon fuel inlet stream. The fuel cell stack comprises a solid oxide fuel cell stack. The hydrogen using device comprises a polymer electrolyte membrane (PEM) fuel cell system located in a vehicle. The system includes selector valve, carbon monoxide scrubbing device, condenser and water separator, and fuel humidifier. Preferred Methods: The step of separating comprises adsorbing a majority of the carbon dioxide and a portion of the water vapor in the fuel exhaust stream in adsorbent bed(s) (11, 13) while allowing a majority of the hydrogen and carbon monoxide in the fuel exhaust stream to be passed through adsorbent bed(s). The step of separating can also comprise providing unpressurized fuel exhaust stream into two adsorbent beds to adsorb a majority of the carbon dioxide and a portion of the water vapor in the fuel exhaust stream in the two adsorbent bed until the adsorbent bed is saturated while regenerating a second adsorbent bed by providing air having a relative humidity of less than or equal to50% through the second adsorbent bed to desorb adsorbed carbon dioxide and water vapor. The step of providing the hydrogen comprises providing the hydrogen separated from the fuel exhaust stream to the hydrogen storage vessel, then providing the hydrogen from the hydrogen storage vessel to the PEM fuel cell system, or providing the hydrogen to the PEM fuel cell system without providing the hydrogen to the hydrogen storage vessel. The method includes scrubbing carbon monoxide from a hydrogen containing stream before the step of providing hydrogen to the PEM fuel cell system. The step of scrubbing carbon monoxide comprises scrubbing carbon monoxide using pressure swing adsorption or a Sabatier reaction. The method includes dividing the hydrogen separated from the fuel exhaust stream into two streams, providing the first stream into the hydrocarbon fuel inlet stream, and providing the second stream to the hydrogen storage vessel or the hydrogen using device. The method includes alternating between providing the hydrogen separated from the fuel exhaust stream into the hydrocarbon fuel inlet stream and providing the hydrogen separated from the fuel exhaust to the hydrogen storage vessel. The method includes dividing the hydrogen separated from the fuel exhaust stream into two streams, providing the first stream into the hydrocarbon fuel inlet stream, providing the second stream to the hydrogen storage vessel or the hydrogen using device, humidifying the fuel inlet stream using water vapor contained in the fuel exhaust stream by using a humidifier, condensing and removing a part(s) of the water vapor in the fuel exhaust stream after the step of humidifying, performing the step of separating after the step of condensing and removing, and providing all hydrogen separated from the fuel exhaust stream to a hydrogen storage vessel or to a hydrogen using device without recycling hydrogen separated from the fuel exhaust stream into the fuel inlet stream and without recycling a portion of the fuel exhaust stream into the fuel inlet stream. The method includes separating the fuel exhaust stream into greater than or equal to2 streams, recycling a first fuel exhaust stream into the fuel inlet stream, separating a portion(s) of hydrogen and carbon monoxide contained in a second fuel exhaust stream using the partial pressure swing adsorption, providing a first portion of the separated hydrogen to the hydrogen using device or to the hydrogen storage vessel, and providing a second portion of the separated hydrogen to the fuel inlet stream. The step of separating comprises a first feed/purge step, first flush step, second feed/purge step, and second flush step.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The fuel exhaust stream comprises hydrogen, carbon monoxide, water vapor, and carbon dioxide.