Two new three-dimensional twelve-ring zeolite frameworks of which zeolite beta is a disordered intergrowth

Michael Treacy, J. M. Newsam

Research output: Contribution to journalArticle

392 Citations (Scopus)

Abstract

Zeolite beta, first described in 19671, is an active catalyst and a useful sorbent1. Sorption1,2 and catalytic data 3,4 suggest that the zeolite could possess a three-dimensional 12-ring pore system. Such a pore system suggests technological potential similar to that of faujasite framework materials, but until now the structure of this zeolite has eluded determination. Powder X-ray diffraction patterns comprise both sharp and broad features, indicative of an extensively faulted structure. Here we determine the structure of zeolite beta by high-resolution electron microscopy, electron diffraction and computer-assisted modelling. The zeolite is an intergrown hybrid of two distinct but closely related structures. Both are constructed from the same centrosymmetrlcal tertiary building unit arranged in layers, and both possess three-dimensional 12-ring pore systems. One end member, polymorph A, forms an enantiomorphic pair, with symmetries P4122 and P4322, with a = 12.4 Å and c = 26.5 Å. Polymorpb B, in which the stacking of layers alternates in handedness, is achiral with space group P1 ̄, and a ≃ b = 12.4 Å, c = 14.5 Å, α ≃ β = 73°, γ ≃ 90°. The high density of stacking faults in zeolite beta materials arises because successive layers must interconnect in either a left- or a right-handed fashion, and both modes of linkage occur with almost equal probability.

Original languageEnglish (US)
Pages (from-to)249-251
Number of pages3
JournalNature
Volume332
Issue number6161
StatePublished - 1988
Externally publishedYes

Fingerprint

Zeolites
High resolution electron microscopy
Stacking faults
Polymorphism
Electron diffraction
Diffraction patterns
Catalysts

ASJC Scopus subject areas

  • General

Cite this

Two new three-dimensional twelve-ring zeolite frameworks of which zeolite beta is a disordered intergrowth. / Treacy, Michael; Newsam, J. M.

In: Nature, Vol. 332, No. 6161, 1988, p. 249-251.

Research output: Contribution to journalArticle

@article{3fc80037d2254665bbd13600ed2e64ae,
title = "Two new three-dimensional twelve-ring zeolite frameworks of which zeolite beta is a disordered intergrowth",
abstract = "Zeolite beta, first described in 19671, is an active catalyst and a useful sorbent1. Sorption1,2 and catalytic data 3,4 suggest that the zeolite could possess a three-dimensional 12-ring pore system. Such a pore system suggests technological potential similar to that of faujasite framework materials, but until now the structure of this zeolite has eluded determination. Powder X-ray diffraction patterns comprise both sharp and broad features, indicative of an extensively faulted structure. Here we determine the structure of zeolite beta by high-resolution electron microscopy, electron diffraction and computer-assisted modelling. The zeolite is an intergrown hybrid of two distinct but closely related structures. Both are constructed from the same centrosymmetrlcal tertiary building unit arranged in layers, and both possess three-dimensional 12-ring pore systems. One end member, polymorph A, forms an enantiomorphic pair, with symmetries P4122 and P4322, with a = 12.4 {\AA} and c = 26.5 {\AA}. Polymorpb B, in which the stacking of layers alternates in handedness, is achiral with space group P1 ̄, and a ≃ b = 12.4 {\AA}, c = 14.5 {\AA}, α ≃ β = 73°, γ ≃ 90°. The high density of stacking faults in zeolite beta materials arises because successive layers must interconnect in either a left- or a right-handed fashion, and both modes of linkage occur with almost equal probability.",
author = "Michael Treacy and Newsam, {J. M.}",
year = "1988",
language = "English (US)",
volume = "332",
pages = "249--251",
journal = "Nature",
issn = "0028-0836",
publisher = "Nature Publishing Group",
number = "6161",

}

TY - JOUR

T1 - Two new three-dimensional twelve-ring zeolite frameworks of which zeolite beta is a disordered intergrowth

AU - Treacy, Michael

AU - Newsam, J. M.

PY - 1988

Y1 - 1988

N2 - Zeolite beta, first described in 19671, is an active catalyst and a useful sorbent1. Sorption1,2 and catalytic data 3,4 suggest that the zeolite could possess a three-dimensional 12-ring pore system. Such a pore system suggests technological potential similar to that of faujasite framework materials, but until now the structure of this zeolite has eluded determination. Powder X-ray diffraction patterns comprise both sharp and broad features, indicative of an extensively faulted structure. Here we determine the structure of zeolite beta by high-resolution electron microscopy, electron diffraction and computer-assisted modelling. The zeolite is an intergrown hybrid of two distinct but closely related structures. Both are constructed from the same centrosymmetrlcal tertiary building unit arranged in layers, and both possess three-dimensional 12-ring pore systems. One end member, polymorph A, forms an enantiomorphic pair, with symmetries P4122 and P4322, with a = 12.4 Å and c = 26.5 Å. Polymorpb B, in which the stacking of layers alternates in handedness, is achiral with space group P1 ̄, and a ≃ b = 12.4 Å, c = 14.5 Å, α ≃ β = 73°, γ ≃ 90°. The high density of stacking faults in zeolite beta materials arises because successive layers must interconnect in either a left- or a right-handed fashion, and both modes of linkage occur with almost equal probability.

AB - Zeolite beta, first described in 19671, is an active catalyst and a useful sorbent1. Sorption1,2 and catalytic data 3,4 suggest that the zeolite could possess a three-dimensional 12-ring pore system. Such a pore system suggests technological potential similar to that of faujasite framework materials, but until now the structure of this zeolite has eluded determination. Powder X-ray diffraction patterns comprise both sharp and broad features, indicative of an extensively faulted structure. Here we determine the structure of zeolite beta by high-resolution electron microscopy, electron diffraction and computer-assisted modelling. The zeolite is an intergrown hybrid of two distinct but closely related structures. Both are constructed from the same centrosymmetrlcal tertiary building unit arranged in layers, and both possess three-dimensional 12-ring pore systems. One end member, polymorph A, forms an enantiomorphic pair, with symmetries P4122 and P4322, with a = 12.4 Å and c = 26.5 Å. Polymorpb B, in which the stacking of layers alternates in handedness, is achiral with space group P1 ̄, and a ≃ b = 12.4 Å, c = 14.5 Å, α ≃ β = 73°, γ ≃ 90°. The high density of stacking faults in zeolite beta materials arises because successive layers must interconnect in either a left- or a right-handed fashion, and both modes of linkage occur with almost equal probability.

UR - http://www.scopus.com/inward/record.url?scp=35348905210&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=35348905210&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:35348905210

VL - 332

SP - 249

EP - 251

JO - Nature

JF - Nature

SN - 0028-0836

IS - 6161

ER -