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A process for the manufacture of zeolite crystal membranes comprises impregnating Al 2 O 3 substrates with slurries containing zeolite crystals in binder solutions; optionally washing and drying the substrates; and hydrothermally reacting the substrates containing adhered zeolite crystals by immersion in a solution containing zeolite precursor raw materials. The binders may be water glass or SiO 2 sol.