Process for the production of a zeolitic material via solvent-free interzeolitic conversion

A process for preparing a zeolitic material comprising YO2 and X2O3 in its frame-work structure, wherein Y stands for a tetravalent element and X stands for a trivalent element, said process comprising:

• (1) preparing a mixture comprising one or more structure directing agents, seed crystals, and a first zeolitic material comprising YO2 and X2O3 in its framework structure, wherein the first zeolitic material has at least one framework structure selected from the group consisting of FAU-, GIS-, MOR-, and LTA-type framework structures;
• and
• (2) heating the mixture obtained in (1) for obtaining a second zeolitic material comprising YO2 and X2O3 in its framework structure, wherein the second zeolitic material obtained in (2) has a different type of framework structure than the first zeolitic material;
• wherein the mixture prepared in (1) and heated in (2) contains 1 to 170 wt. % H2O based on 100 wt.-% of YO2 in the framework structure of the first zeolitic material.