Database of Zeolite Structures
 

Framework Type ETR
Type Material
  Material Name: ECR-34    
 
Chemical Formula:
 
|H1.2K6.3Na4.4| [Ga11.6Al0.3Si 36.1O96]-ETR
 
   
Unit Cell:
 
hexagonal

 P 63 m c (# 186)
    a' = 21.0300Å b' = 21.0300Å c' = 8.5300Å  
    α' = 90.000 ° β' = 90.000° γ' = 120.000°  
   
Framework density:
 
14.7 T/1000 Å3
 
 
Channels:
 
[001] 18 10.1 x 10.1* <-> [001] 8 2.5 x 6.0**
Dimensionality
  Sorption (molecular cross section > 3.4Å): 1-dimensional
  Topological (pore opening > 6-ring): 3-dimensional
   
References:
  Strohmaier, K. G. and Vaughan, D.E.W.
   "Structure of the first silicate molecular sieve with 18-ring pore openings, ECR-34"
   J. Am. Chem. Soc., 125, 16035-16039 (2003)
 
 
Name and Code derivation:
    Exxon Cooperate Research - thirty-four
  ECR-34 (thirty-four)
  ETR
Limiting Rings
 
18-ring viewed along [001]

8-ring viewed normal to [001]