NOVELTY - Pyrotechnic process for providing hydrogen, comprises combusting at least one solid pyrotechnic charge (4a, 4b, 4c, 4d) for producing hot, hydrogenated gas, under pressure, containing 70 vol.% of hydrogen, and purifying at least one part of hydrogenated gas under pressure by passing through a hydrogen separating metal membrane (9) maintained at a temperature of greater than 250 degrees C, preferably 300-600 degrees C to obtain, at the end of the membrane, hydrogenated gas containing 99.99 vol.% of hydrogen.    USE - The pyrotechnic process is useful for providing hydrogen for a fuel cell (all claimed) in aeronautical and military applications, and portable electrical devices such as mobile phones.    ADVANTAGE - The pyrotechnic process is capable of effectively providing the hydrogen with high purity (greater than 99.9%) for portable or embedded fuel cell.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a pyrotechnic device for providing hydrogen, comprising a chamber (3a, 3b, 3c, 3d) provided with at least one delivery orifice (5a, 5b, 5c, 5d) and arranged for combusting the solid pyrotechnic charge at high pressure for delivering hot hydrogen gas, under pressure, a hydrogen separating metal membrane, for purifying hydrogen-containing gas, including an inlet surface and an outlet surface, where the membrane is arranged in a tank so that an empty volume is provided in the tank upstream of its entry face, and a unit (10) for delivering the purified gas, where the chamber and the membrane are placed in communication via a tube so that the hydrogenated gas delivered from the chamber is directed towards the membrane and is arranged in an insulated enclosure and the delivering unit is adapted to assure the delivery of the purified gas.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a device for providing hydrogen.    Combustion chamber (3a, 3b, 3c, 3d)    Solid pyrotechnic charge (4a, 4b, 4c, 4d)    Delivering orifice (5a, 5b, 5c, 5d)    Hydrogen separating membrane (9)    Purified gas delivering unit. (10)