NOVELTY - The reactor comprises a vessel (1), which contains bodies having a metallic support structure onto which a solid, high-porosity coating is applied. The coating contains catalytically active substances for liberating hydrogen from the liquid, hydrogen-carrying compound. The metallic support structure is provided with a recess. The recess is conical, frustum or cylindrical in shape. The reactor vessel has a longitudinal axis, which is perpendicular from the bottom of the recess. The longitudinal axis of the reactor vessel is congruent with the longitudinal axis of the recess.    USE - The reactor is useful for liberating hydrogen from a hydrogen-carrying, liquid compound by catalytic dehydrogenation under pressure and at high temperature, where the hydrogen is useful for an energy transformation machine, preferably an internal combustion engine or a fuel cell (all claimed).    ADVANTAGE - The reactor allows efficient liberation of hydrogen from the hydrogen-carrying, liquid compound at low cost, and enhances the energy density of the fuel cell.    DETAILED DESCRIPTION - The reactor comprises a vessel (1), which contains bodies having a metallic support structure onto which a solid, high-porosity coating is applied. The coating contains catalytically active substances for liberating hydrogen from the liquid, hydrogen-carrying compound. The metallic support structure is provided with a recess. The recess is conical, frustum or cylindrical in shape. The reactor vessel has a longitudinal axis, which is perpendicular from the bottom of the recess. The longitudinal axis of the reactor vessel is congruent with the longitudinal axis of the recess. The reactor vessel is a tube bundle (6) of tubes connected in parallel. The individual tubes are provided at a distance from one another, and contain a body with the recess. The hydrogen-carrying compound flows around the body of the tubes. A heat-exchange process between the tube bundle and their surroundings brings the tube bundle to reaction temperature so that an outer surface of the tube bundle is exposed to a heating medium in a housing, which is tight to the heating medium. The housing has an inflow opening, an outflow opening and an inflow collecting space for the heating medium. The tubes extend vertically. Impermeable heat transfer fins (13) are connected with the tubes. The reactor further comprises a guide device for the heating medium. The heating medium is hot gas. An INDEPENDENT CLAIM is included for a method for supplying hydrogen.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic longitudinal view of a hydrogen liberating reactor.    Vessel (1)    Mounting plates (3, 4)    Tube bundle (6)    Inlet opening (8)    Heat transfer fins. (13)