Database of Disordered Zeolite Structures

Intergrowth Family **SSZ-31**

Periodic Building Unit

Periodic Building Unit (PerBU): | SSZ-31 layer | ||

Layer symmetry | |||

Comment | The positions of the double crankshaft chains have been highlighted to facilitate the understanding of the relationships shown in the connectivity pattern table below | ||

References |
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Lobo, R.F., Tsapatsis, M., Freyhardt, C.C., Chan, I., Chen, C.-Y., Zones, S.I. and Davis, M.E. | |||

"A model for the structure of the large-pore zeolite SSZ-31" | |||

J. Am. Chem. Soc., 119, 3732-3744 (1997) | |||

van Koningsveld, H. and Lobo, R.F. | |||

"Disorder in zeolite SSZ-31 described on the basis of one-dimensional building units" | |||

J. Phys. Chem. B, 107, 10983-10989 (2003) |

Connectivity pattern

Examples |

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^{*} relative to the previous layer^{$} This equivlancy arises from the fact that the double crankshaft chains are at different positions along bNote: It would also be possible to translate the layer by 0/6 a or 3/6 a, but this would result in a sequence of 6-6-4-rings in the connecting plane instead of the sequence of 6-5-5 rings seen in the ac-projections above. As this 6-6-4-ring sequence has not yet been observed, it is not included here. |

Effect on channel system | |

The disorder does not block the 1-dimensional channel system |

Simplest ordered end members

Polymorph E | |||||

Cell Parameters: | monoclinic | C 1 2/m 1 (# 12) | |||

a = 24.7010 Å |
b = 8.3900 Å |
c = 15.0010 Å |
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α = 90.0000° | β = 105.5000° | γ = 90.0000° |

Ring sizes (# T-atoms): | 12 6 5 4 | ||

Channel dimensionality: | Topological (pore opening > 6-ring): 1-dimensional | ||

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

Polymorph F | |||||

Cell Parameters: | orthorhombic | C m c a (# 64) | |||

a = 8.3900 Å |
b = 24.7010 Å |
c = 28.9100 Å |
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α = 90.0000° | β = 90.0000° | γ = 90.0000° |

Ring sizes (# T-atoms): | 12 6 5 4 | ||

Channel dimensionality: | Topological (pore opening > 6-ring): 1-dimensional | ||

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

Polymorph G | |||||

Cell Parameters: | monoclinic | C 1 2/m 1 (# 12) | |||

a = 24.7000 Å |
b = 8.4000 Å |
c = 16.5800 Å |
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α = 90.0000° | β = 119.8000° | γ = 90.0000° |

Ring sizes (# T-atoms): | 12 6 5 4 | ||

Channel dimensionality: | Topological (pore opening > 6-ring): 1-dimensional | ||

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

Polymorph H | |||||

Cell Parameters: | orthorhombic | C m c a (# 64) | |||

a = 8.3900 Å |
b = 24.7010 Å |
c = 28.9100 Å |
|||

α = 90.0000° | β = 90.0000° | γ = 90.0000° |

Ring sizes (# T-atoms): | 12 6 5 4 | ||

Channel dimensionality: | Topological (pore opening > 6-ring): 1-dimensional | ||

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