DOI QR코드

DOI QR Code

Two Crystal structures of Fully Dehydrated Partially Magnesium Exchanged Zeolite A, $Mg_{1.5}Na_9-A\;and\;Mg{2.5}Na_7$-A

  • Kim, Yang (Department of Chemistry, Pusan National University) ;
  • Lee, Suk-Hee (Department of Chemistry, Pusan National University) ;
  • Park, Jong-Yul (Department of Chemistry, Pusan National University) ;
  • Kim, Un-Sik (Department of Chemistry, Pusan National University)
  • Published : 1989.08.20

Abstract

Two Crystal structures of fully dehydrated partially magnesium exchanged zeolite A, stoichiometries of $Mg_{2.5}Na_7-A$ (a = 12.251 (1) ${\AA}$) and $Mg_{1.5}Na_9-A\; (a\;=\;12.214(1)\;{\AA})$ per unit cell, have been determined from the 3-dimensional X-ray diffraction data gathered by counter methods. All structures were solved and refined in the cubic space group Pm3m at 21(1)$^{\circ}C$. The structures of the dehydrated $Mg_{2.5}Na_7-A$ and $Mg_{1.5}Na_9-A$ were refined to yield the final error indices $R_1$ = 0.042 and $R_2$ = 0.049 with 318 reflections, and $R_1$ = 0.034 and $R_2$ = 0.032 with 252 reflections, respectively, for which I > $3{\sigma}(I)$. Both structures indicate that $Mg^{2+}$ ions are coordinated by three framework oxygens and the angle substended at $Mg^{2+}$ ions, O(3)-Mg(1)-O(3) is ca. $120^{\circ}$, close to the idealized trigonal planar value. $Mg^{2+}$ ions preferentially occupy 6-ring sites and $Na^+$ ions occupy 8-ring sites when total number of cations per unit cell is more than 8.

Keywords

References

  1. J. Cryst. Growth v.8 J. F. Charnell
  2. Standard Methods(15th Ed.)
  3. Acc. Chem. Res. v.9 K. Seff
  4. J. Phys. Chem. v.76 K. Seff
  5. J. Phys. Chem. v.88 K. Seff;M. D. Mellum
  6. J. Am. Chem. Soc. v.100 Y. Kim;K. Seff
  7. Structure Determination Package Programs
  8. J. Am. Chem. Soc. v.99 R. L. Firor;K. Seff
  9. J. Phys. Chem. v.91 Y. Kim;K. Seff
  10. Acta crystallogr., Sec A v.24 P. A. Doyle;P. S. Turner
  11. International Tables for X-ray crystallography v.4
  12. Acta. Crystallogr. v.81 D. T. Cromer
  13. International Tables for X-ray crystallography v.4
  14. Tables of Interatomic distances and configurations in Molecules and Ions
  15. Handbook of Chemistry and Physics(63rd Ed.)
  16. A. C. S. Symposium series v.135 Y. Kim;V. Subramanian;R. L. Firor;K. Seff
  17. J. Phys. Chem. v.90 N. H. Heo;W. V. Cruz;K. Seff
  18. J. Phys. Chem. v.86 H. S. Lee;W. V. Cruz;K. Seff
  19. Zeolite Molecular Sieves D. W. Breck

Cited by

  1. ChemInform Abstract: Two Crystal Structures of Fully Dehydrated Partially Magnesium Exchanged Zeolite A, Mg1.5Na9‐A and Mg2.5Na7‐A. vol.21, pp.16, 1990, https://doi.org/10.1002/chin.199016005
  2. Three Crystal Structures of Vacuum-Dehydrated Zeolite X, M46Si100Al92O384, M = Mg2+, Ca2+, and Ba2+ vol.101, pp.35, 1989, https://doi.org/10.1021/jp970907s
  3. Framework-Type Determination for Zeolite Structures in the Inorganic Crystal Structure Database vol.39, pp.3, 1989, https://doi.org/10.1063/1.3432459
  4. K and Ca exchange behavior of zeolite A vol.151, pp.None, 2012, https://doi.org/10.1016/j.micromeso.2011.09.025
  5. Preparation and structural study of fully dehydrated, highly Mg2+-exchanged zeolite Y (FAU, Si/Al = 1.56) from undried methanol solution vol.21, pp.5, 1989, https://doi.org/10.1007/s10934-014-9812-9