Synthesis of Zeolites via Interzeolite Transformations without Organic Structure-Directing Agents

We report synthetic protocols and guiding principles inspired by mechanistic considerations for the synthesis of crystalline microporous solids via interzeolite transformations that avoid direct intervention by organic structure-directing agents. These protocols are specifically implemented to synthesize high-silica MFI (ZSM-5), CHA (chabazite), STF (SSZ-35), and MTW (ZSM-12) zeolites from FAU (faujasite) or BEA (beta) parent materials. These transformations succeed when they lead to daughter structures with higher framework densities, and their nucleation and growth become possible by the presence of seeds or of structural building units common to the parent and target structures, leading, in the latter case, to spontaneous transformations by choosing appropriate synthesis conditions. These protocols allow the synthesis of high-silica frameworks without the use of organic templates otherwise required. The NaOH/SiO2 ratio and Al content in reagents are used to enforce synchronization between the swelling ...

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