Solid propellants for generating hydrogen

A solid propellant composition in the form of a compacted solid propellant pellet that is formed by dead pressing using a pressure from about 500 pounds total load to about 10,000 pounds total load, said solid propellant pellet producing hydrogen or deuterium from a self-sustaining reaction after said reaction is initiated by a heat source sufficient to initiate said reaction, said solid propellant composition comprising a uniform predetermined molar ratio mixture of a first reactant compound which is a complex metal boron compound selected from the complex metal boron compounds of the general formula M(BH.sub.4).sub.x or M(BD.sub.4).sub.x, (wherein M equals a metal selected from an alkali or an alkaline earth metal and x equals the valence of said metal, H is hydrogen, and D is deuterium) and a second reactant compound which is an ammonium salt selected from the ammonium salts of the general formula (NH.sub.4).sub.2 Y or a deuteroammonium salt selected from the deuteroammonium salts of the general formula (ND.sub.4).sub.2 Y, (wherein Y represents the anion Cr.sub.2 O.sub.7 with a total charge of 2, N is nitrogen, H is hydrogen, and D is deuterium), said first reactant compound varying in a molar ratio from about 2 to about 7 while said second reactant compound varying in a molar ratio from about 1 to about 2.