NOVELTY - Conducting catalytic reforming of hydrocarbons and alcohols with steam and carbon dioxide for production of pure hydrogen, comprises the use of far outer impermeable hollow tubular cylinder nesting two more concentric permeable tubular cylinders, a next inner and a most inner one, having most inner permeable cylinder nested within next inner permeable cylinder, and including next inner membrane and most inner membrane.    USE - For conducting catalytic reforming of hydrocarbons and alcohols with steam and carbon dioxide for the production of pure hydrogen (claimed).    ADVANTAGE - The most-inner membrane serves as a backup membrane medium in case the first-inner membrane develops cracks or defects and its permeability to various gases increases. In this case, the most-inner membrane will selectively separate specific gases based on the selected membrane material as described above. Operational and maintenance service for replacing old or damaged membrane and outer non-membrane tubes becomes easier with the proposed design, because each part of the reactor is interconnected with the rest and can be dissembled and assembled accordingly.    DETAILED DESCRIPTION - Conducting catalytic reforming of hydrocarbons and alcohols with steam and carbon dioxide for the production of pure hydrogen, comprises the use of a far outer impermeable hollow tubular cylinder nesting two more concentric permeable tubular cylinders, a next inner and a most inner one, having the most inner permeable cylinder nested within the next inner permeable cylinder thus defining three different annular zones for the catalytic reforming reactions of the components, including next inner membrane and most inner membrane. The most inner permeable cylinder is filled with a reforming catalyst in pellet or particle from which comes in contact with the reactant hydrocarbons, alcohols, steam and carbon dioxide, and including gas heating tubes located along the most inner axis for heating the catalyst to the temperature of the reforming reaction, with the hydrogen product coming from the reforming reactions between hydrocarbons or alcohols with steam and carbon dioxide continuously removed via permeation along the most inner membrane. Most inner membrane is made from an inorganic or composite material. The remaining reaction species partially permeates as well via the most inner membrane, with the permeated species diluted by an inert carrier gas flowing along the next inner annular zone, with hydrogen only continuously removed via permeation along the next inner membrane and continuously withdrawn as well out of the most inner catalytic zone causing for the continuous equilibrium shift of the catalytic reforming reactions evolving within this zone, with next inner membrane made from a metal or non-porous inorganic material permeable only to hydrogen, and with pure hydrogen permeating through the next inner membrane and withdrawn along the far outer cylindrical zone.    DESCRIPTION OF DRAWING(S) - The figure shows the cross-section of a concentric double permeable wall cylindrical reactor with tubular type heaters located along the catalyst zone.