TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The hydrogen membrane reactor comprises a top plate, a bottom plate and a separation plate having opposing surfaces. The top plate and a surface (I) of the separation plate define the reaction chamber. The bottom plate and the surface (II) of the separation plate define the combustion chamber. A hydrogen separation membrane having opposing surfaces is disposed between the top plate and the separation plate. The top plate and the surface (I) of the hydrogen separation membrane define hydrogen exhaust zone. The separation plate and the surface (II) of the hydrogen separation membrane define the reaction zone. The combustion chamber comprises several combustion channels extending radially from the surface of the separation plate. The combustion channels create fluid path through the combustion chamber. The hydrogen exhaust zone comprises several hydrogen exhaust channels extending radially from the surface (I) of the hydrogen membrane and creates a fluid path through the hydrogen exhaust zone. The reaction zone comprises several reaction channels extending radially from the surface (II) of the hydrogen membrane and creates a fluid path through the reaction zone. The tail gas supply line makes a fluid connection between the reaction zone and the combustion chamber, and reaction zone and oxygen supply line. The hydrogen generator further comprises a fuel heat exchanger connected to fuel supply line and a combustion byproduct line or reaction product line. An oxygen heat exchanger is connected to the oxygen supply line and a combustion byproduct line or reaction product supply line. The oxygen heat exchanger is a counter-flow type heat exchanger or a stacked-plate heat exchanger. The hydrogen generator comprises a fuel heat exchanger connect to a fuel supply line and a combustion byproduct line. A hydrogen reservoir is in fluid connection with the reaction product supply line. A hydrogen fuel cell is in fluid connection with the reaction product supply line. The generator further has a combustion catalyst packed or coated on internal surfaces of the combustion chamber. An ammonia absorbent supply is in fluid communication with the reaction product supply line.Preferred Properties: The height and width of the combustion channels, hydrogen exhaust channels and the reaction channels is 0.01-10 mm, preferably 0.5-5 mm. The fuel heat exchanger is a counter flow-type heat exchanger or a stacked-plate-type heat exchanger having channels with height and width of 0.01-10 mm between stacked plates. The combustion catalyst and the reaction catalyst has a light-off temperature less than 650degreesC.Preferred Process: The hydrogen producing fuel is preheated before flowing into the reaction zone. Preheated oxygen is passed through the reaction chamber. The separated hydrogen is passed into a hydrogen reservoir or a hydrogen fuel cell. The separated hydrogen is passed through an ammonia absorbent.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Catalyst: The reaction catalyst is ruthenium, nickel, iron oxide, rhodium, iridium or rhenium catalyst. The combustion catalyst is platinum-rhodium catalyst. SPECIFIC COMPOUNDS - The fuel supply is ammonia, or methanol, propane, butane or kerosene supply.