Novel microporous zirconium silicate (K2ZrSi3O9 center dot 2H(2)O) from high temperature phase transformation
authors Ferreira, A; Lin, Z; Soares, MR; Rocha, J
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords Zirconosilicate; Microporous; Ab initio; High-temperature phase transformation
keywords INITIO STRUCTURE DETERMINATION; POWDER DIFFRACTION DATA; STRUCTURAL-CHARACTERIZATION; AB-INITIO; FRAMEWORK ZIRCONIUM; ION-EXCHANGE; STANNOSILICATE; K2TISI3O9-CENTER-DOT-H2O; TRISILICATE; ZIRCONOSILICATES
abstract A new microporous zirconosilicate K2ZrSi3O9 center dot 2H(2)O (AV-15) has been prepared by high-temperature phase transformation at 910 degrees C. Its structure has been determined ab initio from powder x-ray diffraction data. The unit cell is orthorhombic, space group C222(1) (no. 20), Z=4 with cell dimensions: a=8.105(3), b=10.684(5), c= 12.030(5) angstrom, V=1041.76(7) angstrom(3). The framework connection of AV-15 is essentially the same as the previously reported sodium stannosilicate AV-10 while the locations of potassium and water molecules in the former are quite different from those of the sodium and water molecules in AV-10. In AV-10 sodium and water molecules form a sinucoidal chain, while potassium and water molecules build up a linear chain in AV-15. The water molecules in AV-15 are lost on heating with a typical zeolitic behaviour. SEM shows that the particle sizes and habits of AV-15 and parent umbite material are the same. The Si-29 MAS NMR spectrum of AV-15 displays two resonances at ca. -89.4 and -90.1 ppm in a 1:2 intensity ratio. Thermogravimetry analysis confirms the existence of water in this material. (c) 2010 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
year published 2010
volume 183
issue 12
beginning page 3067
ending page 3072
digital object identifier (doi) 10.1016/j.jssc.2010.10.013
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000285431100044
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