TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The step of collecting the hydrogen gas from the exhaust zone of the reaction chamber comprises flowing the hydrogen gas through a methanator having a methanation catalyst to convert the carbon monoxide and/or carbon dioxide to methane. The step of flowing a hydrogen producing fuel in the reaction zone comprises contacting the hydrogen producing fuel with a reaction catalyst in a pre-treatment chamber containing a suitable catalyst to produce a pre-treatment chamber hydrogen containing gas mixture; and flowing the resultant pre-treatment chamber hydrogen containing gas mixture to the reaction zone. The step of flowing a hydrogen producing fuel in the reaction zone comprises contacting a hydrocarbon fuel with water in the reaction zone to produce hydrogen gas and tail gases, the hydrogen gas and the tail gases including water vapor. The method further comprises condensing water vapor in the reaction tail gases by cooling and pressure reduction, obtaining condensed water and tail gases; routing resultant tail gases to the combustion chamber; and recycling the condensed water. It also includes condensing water present in the combustion chamber byproduct gases by heat exchange with the incoming air to the combustion chamber; recycling the water to the water supply; and venting the cooled combustion chamber product gases to the atmosphere. The hydrogen separation through the membrane can be improved by decreasing the hydrogen partial pressure in the hydrogen exhaust zone by employing a vacuum pump or a condensable inert gas. The water is preheated to about the boiling point of the hydrocarbon fuel. The combustion reaction is carried out in presence of water and the second combustion byproduct gases include water vapor.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The fuel is ammonia. The hydrogen gas includes carbon monoxide and/or carbon dioxide.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: The second fuel supply line is in fluid communication with the oxygen supply line. The tail gas supply line transports tail gases from the reaction chamber to the combustion chamber and the second fuel supply (54) is in fluid communication with the tail gas supply line. The hydrogen membrane reactor comprises top plate, bottom plate, and separation plate. The separation plate has opposing surfaces. The top plate and the first surface of the separation plate together define the reaction chamber. The bottom plate and the second surface of the separation plate together define the combustion chamber. The hydrogen separation membrane has two opposing surfaces disposed between the top plate and the separation plate. The top plate and the first surface of the hydrogen separation membrane together define a hydrogen exhaust zone and the separation plate and the second surface of the hydrogen separation membrane together defining a reaction zone. The first fuel supply line transports fuel to the reaction zone. The second fuel supply line is in fluid connection with the combustion chamber. The tail gas supply line transports tail gas from the reaction zone to the combustion chamber. The combustion channels in the combustion chamber extends radially from the second surface of the separation plate, or the bottom plate; the plurality of reaction channels in the reaction chamber extends radially from the first surface of the separation plate, creating a fluid path through the reaction zone; and/or the plurality of hydrogen exhaust channels extends radially from the top plate. The hydrogen generator further comprises a fuel heat exchanger (30) that is connected to the fuel supply line and the reaction product line, and an oxygen heat exchanger (30) that is connected to the oxygen supply line and the combustion by-product line. The hydrogen generator further comprises an ammonia adsorbent supply (80) in fluid communication with the reaction product line and the combustion-by-product line.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The fuel is ammonia. The hydrogen gas includes carbon monoxide and/or carbon dioxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The hydrogen producing fuel is a hydrocarbon fuel. The combustible fuel is a hydrocarbon fuel.