Production of enclosed zeolite layers for use in e.g. catalysis or separation membranes, comprises first seed crystallization on carrier followed by further crystallization using different synthesis solution or gel

摘要

Production of enclosed zeolite layers involves: (1) single-stage crystallization of zeolite seed crystals directly on a carrier; and (2) treating the seeded carrier with a synthesis solution or gel under suitable conditions to grow an enclosed layer in a second crystallization step, the synthesis solution or gel in this second crystallization cycle having a composition different to that in the seeding layer process.