ORGANOTEMPLATE-FREE SYNTHETIC PROCESS FOR PRODUCTION OF A ZEOLITIC MATERIAL OF CHA-TYPE STRUCTURE Russian patent published in 2017 - IPC C01B39/02 C01B39/10 

FIELD: chemistry.

SUBSTANCE: invention relates to synthesis of zeolites. Disclosed is a method for synthesis of a zeolite having a CHA-type framework structure containing YO₂, X₂O₃ and optionally containing Z₂O₅. Method involves following steps: (1) preparing a mixture containing one or more sources of YO₂, one or more sources of X₂O₃ and seed crystals, having a CHA-type framework structure, where CHA frame structure of seed crystals contains YO₂, X₂O₃ and optionally contains Z₂O₅; (2) crystallisation of mixture obtained at step (1); where Y denotes a tetravalent element, X denotes a trivalent element and Z denotes a pentavalent element. Method comprises optionally adding one or more sources Z₂O₅ at step (1), and if CHA framework structure of seed crystals does not contain Z₂O₅, seed crystals have molar ratio YO₂:X₂O₃, equal to or greater than 5.

EFFECT: method enables to obtain CHA type zeolite with high molar ratio YO₂:X₂O₃ without using an organic template.

41 cl, 15 dwg, 7 ex