In this study, we present the synthesis, characterization, and structural analysis of a novel zeolite, ITQ-70, using 3D electron diffraction. This unique material was synthesized under alkaline conditions, employing tetrakis(diethylamino)phosphonium as an 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 the other. A notable feature of this zeolite is the presence of structurally ordered defects in very high concentrations (38 % of the silicon atoms). As a result, ITQ-70 exhibits the lowest framework density (10.0 T/1000 Å3) ever reported for any zeolite except RWY (7.6 T/1000 Å3), which contains sulfur instead of oxygen connecting T-atoms.

Institute of Physics of the Czech Academy of Sciences v v i Na Slovance 2 Prague 8 182 00 Czechia

Instituto de Tecnología Química Universitat Politècnica de València Consejo Superior de Investigaciones Científicas Avenida de los Naranjos s n 46022 Valencia Spain

NanoMEGAS SPRL Rue Èmile Claus 49 bte 9 B 1080 Brussels Belgium

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