C01B 3/068

Production of hydrogen or of gaseous mixtures containing {a substantial proportion of} hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents {the hydrogen being generated from the water as a result of a cyclus of reactions, not covered by groups [CPC: C01B3/063] or [CPC: C01B3/105]}