The thermal induced structural modifications of a natural levyne were studied by both time-resolved synchrotron X-ray powder diffraction between room-T and 800°C, and by conventional-source high- T single crystal X-ray diffraction. Above 230°C, a new topology rises, coexisting in a percentage of about 50% with the original one. The new framework consists of a sequence of a new zeolitic cage (described as a 20-hedron formed by fourteen 6mR and by six 4mR) and two cancrinite cages along [0001]. The new topology – reported in the database of the hypothetical zeolite structures as 166_2_293 – belongs to the ABC-6 family and can be described with the sequence ABABABCBC, to be compared with that of levyne AABCCABBC.
Dehydration dynamics of levyne: evidence for a new zeolite topology
ARLETTI, Rossella;CAMARA ARTIGAS, Fernando
2013-01-01
Abstract
The thermal induced structural modifications of a natural levyne were studied by both time-resolved synchrotron X-ray powder diffraction between room-T and 800°C, and by conventional-source high- T single crystal X-ray diffraction. Above 230°C, a new topology rises, coexisting in a percentage of about 50% with the original one. The new framework consists of a sequence of a new zeolitic cage (described as a 20-hedron formed by fourteen 6mR and by six 4mR) and two cancrinite cages along [0001]. The new topology – reported in the database of the hypothetical zeolite structures as 166_2_293 – belongs to the ABC-6 family and can be described with the sequence ABABABCBC, to be compared with that of levyne AABCCABBC.
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