K-paracelsian (KAlSi3O8·H2O) and identification of a simple building scheme of dense double-crankshaft zeolite topologies

IUCrJ

Boruntea, C.-R.¹  Vennestrm, P.N.R.²  Lundegaard, L.F.³ 

[1] Haldor Topse A/S, Haldor Topses Alle 1, Kgs. Lyngby 2800, Denmark;Instituto de Tecnologa Qumica, Universitat Politcnica de Valncia-Consejo Superior de Investigaciones Cientficas, Avenida de los Naranjos s/n, Valencia 46022, Spain;Umicore Denmark ApS, Njsomhedsvej 20, Kgs. Lyngby 2800, Denmark

关键词: K-PARACELSIAN;    DENSE DOUBLE-CRANKSHAFT ZEOLITE TOPOLOGIES;    STRUCTURE REFINEMENT;    CRYSTAL ENGINEERING;    INORGANIC POROUS SOLIDS;    MICROPOROUS MATERIALS;   

DOI  :  10.1107/S2052252518016111

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

During screening of the phase space using KOH and 1-methyl-4-aza-1-azoniabicyclo­[2.2.2]octane hydroxide (1-methyl-DABCO) under hydrothermal zeolite synthesis conditions, K-paracelsian was synthesized. Scanning electron microscopy, energy dispersive X-ray spectroscopy and ex situ powder X-ray diffraction analysis revealed a material that is compositionally closely related to the mineral microcline and structurally closely related to the mineral paracelsian, both of which are feldspars. In contrast to the feldspars, K-paracelsian contains intrazeolitic water corresponding to one molecule per cage. In the case of K-paracelsian it might be useful to consider it a link between feldspars and zeolites. It was also shown that K-paracelsian can be described as the simplest endmember of a family of dense double-crankshaft zeolite topologies. By applying the identified building principle, a number of known zeolite topologies can be constructed. Furthermore, it facilitates the construction of a range of hypothetical small-pore structures that are crystallo-chemically healthy, but which have not yet been realized experimentally.

【 授权许可】

CC BY