title: The first zeolite with a tri-directional extra-large 14-ring pore system derived using a phosphonium-based organic molecule.
abstract: A new germanosilicate zeolite (denoted as ITQ-53) with extra-large pores has been synthesised using tri-tertbutylmethylphosphonium cation as the organic structure directing agent (OSDA). Rotation electron diffraction (RED) was used to identify ITQ-53 from an initially-synthesised sample containing impurities, and to solve its structure. The structure was refined against PXRD data of pure ITQ-53 samples obtained after synthesis optimisation. ITQ-53 is the first example of extra-large pore zeolites with tri-directional interconnected 14 × 14 × 14-ring channels. It is stable up to at least 650 °C. The structure of ITQ-53 changes from monoclinic to orthorhombic upon calcination.
authors.affiliation: Berzelii Center EXSELENT on Porous Materials and Inorganic and Structural Chemistry, Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden. xzou@mmk.su.se.
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Yun
authors.forename: Manuel
authors.initials: M
authors.lastname: Hernández
authors.forename: Wei
authors.initials: W
authors.lastname: Wan
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Zou
authors.forename: Jose L
authors.initials: JL
authors.lastname: Jordá
authors.forename: Angel
authors.initials: A
authors.lastname: Cantín
authors.forename: Fernando
authors.initials: F
authors.lastname: Rey
authors.forename: Avelino
authors.initials: A
authors.lastname: Corma