Process for the production of a zeolitic material via interzeolitic conversion

A process for preparing a zeolite material having a framework structure comprising SiO2 and X2O3, wherein X is a trivalent element, the process comprising:

• (1) preparing a mixture comprising a structure directing agent and a first zeolite material having a framework structure comprising SiO2 and X2O3, wherein the first zeolite material has an FER-, TON-, MTT-, BEA-, MEL-, MWW-, MIS-, and/or MFI-type framework structure;
• and
• (2) heating the mixture, to obtain a second zeolite material having a framework structure comprising SiO2 and X2O3,
• wherein the second zeolite material obtained in (2) has a different type of framework structure than the first zeolite material comprised in the mixture prepared in (1)
• wherein the second zeolite material obtained in (2) has a CHA-type framework structure or an AEI-type framework structure, and wherein the mixture prepared in (1) and heated in (2) further comprises one source for OH—, wherein said one source consists of sodium hydroxide.