NOVELTY - The continuous hydrogen production system comprises a pair of reaction vessels (10) containing catalyst material. The reactor vessel has an inlet (12) and an outlet (13). The reaction vessel is operable in a production mode in which steam is inputted into the reaction vessel and the product mixture is outputted and in a regeneration mode in which gas including a global warming constituent is inputted into the reaction vessel and regeneration off gas is outputted. When the system reaches the operation conditions in the production mode, the input steam is heated.    USE - The continuous system is useful for producing hydrogen by catalytic electrochemical decomposition of water and regeneration of the catalysts used in the production.    ADVANTAGE - The system can able to continuously and simultaneously perform the catalytic electrochemical decomposition of water and the catalyst regeneration in adjacent reaction vessels without the additional external energy input, and provides efficient reduction of steam and inorganic salts and a carbon-free pathway for the cost-effective production of hydrogen.    DETAILED DESCRIPTION - The continuous hydrogen production system comprises a pair of reaction vessels (10) containing catalyst material. The reactor vessel has an inlet (12) and an outlet (13). The reaction vessel is operable in a production mode in which steam is inputted into the reaction vessel and the product mixture is outputted and in a regeneration mode in which gas including a global warming constituent is inputted into the reaction vessel and regeneration off gas is outputted. When the system reaches the operation conditions in the production mode, the input steam is heated prior to entry into the reaction vessel by heat transfer with the product mixture or the regeneration off gas. The gas used in the regeneration mode is biogas or flue gas. The reaction vessel contains a bed of porous metal oxide, metal oxide distributed on inert particles or metal-based pellet form. The gas supplied during the regeneration mode of the system is provided at an elevated temperature. An appropriate gas velocity is provided through the reaction vessel to fluidize the bed of the catalyst material. The regeneration off gas is used to heat the steam/water prior to introduction into the reaction vessel operating in the production mode. The product mixture is used to preheat the steam/water for feed into the reaction vessel operating in the production mode. The catalyst material is oxidized in the production mode to form oxide products, where the particular type of the oxide product is optimized by adjusting wetness, operating temperature, operating pressure, time and/or the influence of contaminants in the feed catalyst material. The water is provided in a lower part of each reaction vessel to generate the required steam by absorbing heat from the reactions in the vessel in the production mode and to recycle enough heat to minimize the need for the addition of external heat to the reaction vessel. The portion of the heat liberated when in the production mode, is retained in-system to maintain the temperature of the reactants. A vapor condenser and a steam generator are integrated as a single (modular) unit operation. The counter current heat exchange occurs between the product mixture and the inlet water/steam in the vapor condenser and the steam generator. The product mixture undergoes separation to isolate the hydrogen gas, which is stored at the final system pressure. The reaction vessel is operable in a hydrogen production condition and a catalyst regeneration condition. The operating conditions in the reaction vessel are adjusted to maximize the hydrogen production in the production condition and to maximize the electro-deposition or regeneration of the catalyst material in the regeneration condition. The catalyst material is iron complexes, transition metals, transition metal complexes, and electro-positive and amphoteric elements.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a system for continuous hydrogen steam-iron process.    Reaction vessel (10)    Condenser (11)    Inlet (12)    Outlet (13)    Fan (16)    Gas scrubber. (18)