Database of Zeolite Structures
 

Framework Type IWW
Reference Material
  Material Name: ITQ-22    
 
Chemical Formula:		  
[Si89.8Ge22.2O224]-IWW		  
   
Unit Cell: 		 
orthorhombic
 P b a m (# 55)
    a' = 42.1326 Å b' = 12.9885 Å c' = 12.6814 Å  
    α' = 90.000° β' = 90.000° γ' = 90.000°  
   
Framework Density: 		 
16.1 T/1000 Å3
 
  
Channels: 		 
[001] 12 6.0 x 6.7* <-> n[001] 10 4.9 x 4.9** <-> [001] 8 3.3 x 4.6*
Dimensionality
  Sorption (molecular cross section > 3.4Å): 3-dimensional
  Topological (pore opening > 6-ring): 3-dimensional
   
References:
  Corma, A., Rey, F., Valencia, S., Jorda, J.L. and Rius, J.
  "A zeolite with interconnected 8-, 10- and 12-ring pores and its unique catalytic selectivity"
Nature Mater., 2, 493-497 (2003)
 
  
Name and Code derivation:
    Instituto de Tecnologia Quimica Valencia - twenty-two
  ICJ40 (forty) (twenty-two)
  IWW
Limiting Rings
 
12-ring viewed along [001]

10-ring viewed normal to [001]

8-ring viewed allong [001]

Copyright © 2017 Structure Commission of the International Zeolite Association (IZA-SC)