title: Synthesis design and structure of a multipore zeolite with interconnected 12- and 10-MR channels.
abstract: A new molecular sieve, ITQ-38, containing interconnected large and medium pores in its structure has been synthesized. The rational combination of dicationic piperidine-derivative molecules as organic structure directing agents (OSDAs) with germanium and boron atoms in alkaline media has allowed the synthesis of ITQ-38 zeolite. High-resolution transmission electron microscopy (HRTEM) has been used to elucidate the framework topology of ITQ-38, revealing the presence of domains of perfect ITQ-38 crystals as well as very small areas containing nanosized ITQ-38/ITQ-22 intergrowths. The structure of ITQ-38 is highly related to ITQ-22 and the recently described polymorph C of ITQ-39 zeolite. It shares a common building layer with ITQ-22 and contains the same building unit as the polymorph C of ITQ-39. All three structures present similar framework density, 16.1 T atoms/1000 Å(3).
authors.affiliation: Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia-Consejo Superior de Investigaciones Científicas, Av. De los Naranjos s/n, 46022 Valencia, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Moliner
authors.forename: Tom
authors.initials: T
authors.lastname: Willhammar
authors.forename: Wei
authors.initials: W
authors.lastname: Wan
authors.forename: Jorge
authors.initials: J
authors.lastname: González
authors.forename: Fernando
authors.initials: F
authors.lastname: Rey
authors.forename: Jose L
authors.initials: JL
authors.lastname: Jorda
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Zou
authors.forename: Avelino
authors.initials: A
authors.lastname: Corma
mesh_terms: D001895:Boron / Q000737:chemistry; D002412:Cations; D002621:Chemistry / Q000379:methods; D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods; D005857:Germanium / Q000737:chemistry; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods; D011208:Powders / Q000737:chemistry; D017641:Zeolites / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D002412:Cations; D011208:Powders; D005857:Germanium; D017641:Zeolites; D001895:Boron