Database of Disordered Zeolite Structures
 
Intergrowth Family ZSM-48
Periodic Building Unit
 
  Periodic Building Unit (PerBU):  
 
  Layer symmetry P m m (2)  
 
  2D cell parameters a = 8.26 Å b = 24.99 Å gamma = 90°    
 
  References

    Schlenker, J.L. Rohrbaugh, W.J., Chu, P., Valyocsik, E.W. and Kokotailo, G.T.
   "The framework topology of ZSM-48: a high silica zeolite"
   Zeolites, 5, 355-358 (1985)

    Lobo, R.F. and van Koningsveld, H.
   "New description of the disorder in zeolite ZSM-48"
   J. Am. Chem. Soc., 124, 13222-13230 (2002)

Connectivity pattern
Examples
The layers are stacked along the [001] direction using the following connectivity patterns

 
Symmetry
Operation*
Translation* Comment Image
1/3b
  equivalent to 1/2 a -1/6 b
1/2 a + 1/3 b
  equivalent to -1/6 b
 

* relative to the previous layer


 
Effect on channel system
  The disorder does not block the 1-dimensional channel system
Simplest ordered end members
The polymorphs for ZSM-48 were designated with numbers in reference 2 above and in the pdf linked in the "PDF" pulldown in the header. To be consistent with the other entries in this website, the polymorphs were renamed with capital letters. The corresponding numbers are indicated with each polymorph below.

 
  Polymorph RFE
 
Cell Parameters: orthorhombic I m m a: (# 74)
  a = 8.2570 Å b = 14.5619 Å c = 20.3137 Å  
  α = 90.000° β = 90.000° γ = 90.000°  
  Volume = 2442.5 Å3
Framework Density (FDSi): 19.7
Ring sizes (# T-atoms): 10  6  5  4    
Channel dimensionality: Topological (pore opening > 6-ring): 1-dimensional  
  Maximum diameter of a sphere:  
    that can be included 6.36 Å  
    that can diffuse along a:  5.59 Å b:  2 Å c:  1.81 Å  
    addional volume data  
Composite Building Units:
afi
mel
imf
This polymorph corresponds to Polymorph UDUD in reference 1 and Polymorph 6 in reference 2 above.

In this space group and setting, the PerBUs are stacked along [011]
Adjacent layers generated by the same connectivity pattern (same basic color) are shown with different shades for clarity

Note: This polymorph corresponds to the ordered framework RFE
 
 
  Polymorph ZSM-48_B
 
Cell Parameters: monoclinic C 1 2/m 1: (# 12)
  a = 24.9940 Å b = 8.2570 Å c = 12.6100 Å  
  α = 90.0000° β = 109.1860° γ = 90.0000°  
  Volume = 2457.8 Å3
Framework Density (FDSi): 19.5
Ring sizes (# T-atoms): 10  6  5  4    
Channel dimensionality: Topological (pore opening > 6-ring): 1-dimensional  
  Maximum diameter of a sphere:  
    that can be included 6.28 Å  
    that can diffuse along a:  1.99 Å b:  5.48 Å c:  1.82 Å  
    [0 1 0] :  5.48 Å
    addional volume data  
Composite Building Units:
lau
mel
imf
This polymorph corresponds to Polymorph 3 in reference 2 above.

In this space group and setting, the PerBUs are stacked along [001]
Adjacent layers generated by the same connectivity pattern (same basic color) are shown with different shades for clarity

Note: This polymorph has NOT been observed as a pure ordered material