Abstract
In this study, we present the synthesis, characterization, and structural analysis of a novel zeolite, ITQ‐70, using 3D electron diffraction tomography. This unique material was synthesized under alkaline conditions, employing tetrakis(diethylamino)phosphonium as organic structure‐directing agent, leading to the formation of a pure silica zeolite. ITQ‐70 is distinguished by its extra‐large pore apertures, which extend along all three axes and intersect one to each other. A notable feature of this zeolite is the presence of structurally ordered defects in very high concentration (38% of the silicon atoms). As a result, ITQ‐70 exhibits the lowest framework density (10.0 T/1000Å3) ever reported for any zeolite except RWY (7.6 T/1000Å3), which contains sulfur instead of oxygen connecting T‐atoms.
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