Ordering of silicon and aluminium ions in the framework of NaX zeolites. A solid-state high-resolution29Si n.m.r. study

Abstract
29 Si N.m.r. has provided detailed information on silicon–aluminium ordering of the aluminosilicate frame work of zeolites which showed that the arrangement of silicon and aluminium ions of an NaX zeolite with Si/Al 1·4 is not centrosymmetrical.