The present invention relates to a process for producing a hydrogen-containing gas. The process comprises introducing a regeneration gas into a hydrogen reaction vessel containing solid packing material thereby at least partially regenerating the solid packing material and forming an effluent gas from the regeneration gas. At least a portion of the effluent gas is introduced into another hydrogen reaction vessel containing solid packing material. The effluent gas may be used, for example, to purge the other hydrogen reaction vessel and/or regenerate the solid packing material in the other hydrogen reaction vessel. Solid packing materials may include at least one of a complex metal oxide, a steam hydrocarbon reforming catalyst, an oxygen ion conducting ceramic, a hydrocarbon partial oxidation catalyst, and a hydrocarbon cracking catalyst.