HPM-16, a New Stable Interrupted Zeolite with a Multidimensional Mixed Medium-Large Pore System Containing Supercages.

HPM-16 is a highly porous germanosilicate zeolite with an interrupted framework that contains a three-dimensional system of 12+10×10(12)×12+10 membered ring (MR) pores. The 10(12) MR pore in the b direction is a 10MR pore with long 12MR stretches forming 30 Å  long tubular supercages. Along one direction the 10MR pores are fused, meaning that the  separation between adjacent pores consists of a single tetrahedron that is, additionally,   connected to only three additional tetrahedra (a Q 3 ). These fused pores are thus decorated  by T-OH groups along the whole diffusion path, creating a hydrophilic region embedded in an  otherwise essentially hydrophobic environment. The structure is built from highly porous  12×12×12 MR uninterrupted layers that are connected to each other through Q 3 producing a  second system of 10×10×10 MR pores. This zeolite can be extensively degermanated  yielding a material with high thermal stability, despite its interrupted nature.