Database of Zeolite Structures
 

Framework Type VFI
Reference Material
  Material Name: VPI-5    
 
Chemical Formula:
 
|(H2O)42 | [Al18P18O72]-VFI
 
   
Unit Cell:§
 
hexagonal

 P 63 (# 193)
    a' = 18.9750 Å b' = 18.9750 Å c' = 8.1040 Å  
    α' = 90.000° β' = 90.000° γ' = 120.000°  
   
Framework Density:
 
14.2 T/1000 Å3
 
 
Channels:
 
[001] 18 12.7 x 12.7*
Dimensionality
  Sorption (molecular cross section > 3.4Å): 1-dimensional
  Topological (pore opening > 6-ring): 1-dimensional
   
References:
  Davis, M.E., Saldarriaga, C., Montes, C., Garces, J. and Crowder, C.
  "A molecular sieve with eighteen-membered rings"
Nature, 331, 698-699 (1988)
Material name:   VPI-5
Chemical formula:   [Al18P18O72]-VFI
  § McCusker, L.B., Baerlocher, Ch., Jahn, E. and Bülow, M.
  "The triple helix inside the large-pore aluminophosphate molecular sieve VPI-5"
Zeolites, 11, 308-313 (1991)
DOI: 10.1016/0144-2449(91)80292-8
  Richardson Jr., J.W., Smith, J.V. and Pluth, J.J.
  "Theoretical nets with 18-ring channels: enumeration, geometrical modelling, and neutron diffraction study of AlPO4-54"
J. Phys. Chem., 93, 8212-8219 (1989)
Material name:   VPI-5
Chemical formula:   [Al18P18O72]-VFI
 
 
Name and Code derivation:
    Virgina Polytechnic Institute - five
  VPI-5 (five)
  VFI
 
 
§ Chemical Formula and Unit Cell taken from the reference marked with this sign
Limiting Rings
 
18-ring viewed along [001]