NOVELTY - The hydrogen generation system comprises a fuel reforming reactor generating a hydrogen-rich reformate gas at a temperature of greater than 150 degrees C, a pressure swing adsorption (PSA) hydrogen purification unit that separates the reformate gas into a relatively pure hydrogen stream and an off-gas stream, and a catalytic reactor in downstream of the PSA unit that converts carbon monoxide and hydrogen contained in the relatively pure hydrogen stream into methane and water vapor. A combustion reactor is integrated with the fuel reforming reactor.    USE - The system is useful for generating hydrogen, which is useful in a proton exchange membrane fuel cell for generating electricity.    ADVANTAGE - The system is reliable, economic and simple for generating hydrogen with high efficiency thus capable of improving the performance of the fuel cell, and avoids the thermal run-away of the reactor thus avoiding the reconversion of carbon dioxide into methane.    DETAILED DESCRIPTION - The hydrogen generation system comprises a fuel reforming reactor generating a hydrogen-rich reformate gas at a temperature of greater than 150 degrees C, a pressure swing adsorption (PSA) hydrogen purification unit that separates the reformate gas into a relatively pure hydrogen stream and an off-gas stream, and a catalytic reactor in downstream of the PSA unit that converts carbon monoxide and hydrogen contained in the relatively pure hydrogen stream into methane and water vapor. A combustion reactor is integrated with the fuel reforming reactor, and uses the off-gas stream to provide thermal energy to the reactor. The combustion reactor has an exhaust gas at a temperature of greater than 150 degrees C exiting the combustion reactor. The catalytic reactor is positioned such that the temperature of the hydrogen-rich reformate gas and the exhaust gas maintains the temperature of the catalytic reactor. A secondary purification stage is present in downstream of the PSA unit and the catalytic reactor, and has a water adsorbent material bed that adsorbs the water vapor. A material is present in downstream of the water absorbent material to absorb the hydrogen gas into an exhaust stream that exits the bed thus concentrating the non-hydrogen components such as methane. The absorbed hydrogen gas is then desorbed to create an exiting very pure hydrogen stream.    DESCRIPTION OF DRAWING(S) - The figure shows a hydrogen generation system.    Reformer (102)    Water gas shift reactor (103)    Condenser (104)    Pressure swing absorption (105)    Methanation reactor. (106)