TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The hydrogen discharged from occlusion material is contacted with carbon monoxide adsorption agent, and carbon monoxide is adsorbed and removed. The carbon monoxide adsorption agent is regenerated after adsorption. The carbon monoxide adsorption agent is filled in carbon monoxide adsorption tower, and carbon monoxide adsorption process and regeneration of adsorption agent are alternately carried out. The heat generated during occlusion of hydrogen storage material is used for raising temperature of carbon monoxide adsorption agent during regeneration, and for raising temperature of hydrogen occlusion alloy. The heat generated during adsorption of carbon monoxide adsorption agent is used for raising temperature of hydrogen storage material during hydrogen desorption process. The process gas an/or carbon monoxide adsorption agent is heated using latent heat of water vapor contained in hydrogen rich gas having carbon monoxide, sensible heat of hydrogen rich gas, latent heat of water vapor contained in combustion exhaust gas, and sensible of combustion exhaust gas. The hydrogen storage material is heated using latent heat of water vapor contained in hydrogen rich gas having carbon monoxide, sensible heat of hydrogen rich gas and sensible heat of combustion exhaust gas. Preferred Conditions: The carbon monoxide adsorption and removal process is carried out at 80degreesC or less and atmosphere pressure more than normal pressure. Hydrogen storage is carried out at 80degreesC or less and atmorpheric pressure more than normal pressure. The regeneration of carbon monoxide adsorption agent is carried out at temperature above the reaction temperature in adsorption process by 250degreesC or less and atmospheric pressure below the atmospheric pressure in carbon monoxide adsorption process.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Gas: The hydrogen rich gas containing carbon monoxide is gas (a) formed by modifying hydrocarbon-containing fuel (A) with water vapor, gas (b) formed by modifying hydrocarbon-containing fuel by partial oxidation, gas (c) modified with water vapor during modification of hydrocarbon-containing fuel by partial oxidation, gas (d) formed by modifying gases (a-c), or gas formed by circulating gases (a-c) through crude separation membranes, such as ceramic filter and raising hydrogen concentration. Preferred Material: The hydrogen storage material is hydrogen occlusion alloy, surface-treated hydrogen occlusion alloy, chemical hydride and/or carbon nanotube.