The framework topology of ZSM-23: A high silica zeolite

Rohrman, A.C.; LaPierre, Rene B.; Schlenker, J.L.; Wood, J. D.; Valyocsik, E.W.; Rubin, Mae K.; Higgins, John B.; Rohrbaugh, Wayne J.

doi:10.1016/0144-2449(85)90123-x

Cited by 74 publications

(32 citation statements)

References 5 publications

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“…The vector c in the vertical direction was determined to be d(0 0 1) = 1.11 nm. These values correspond very well with the results obtained from the original structure determination by Rohrman et al, which was later refined by Marler et al [28,35]. Fig.…”

Section: Samplesupporting

confidence: 85%

Crystallization and porosity of ZSM-23

Möller

Bein

2011

Microporous and Mesoporous Materials

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Section: Samplesupporting

confidence: 85%

Crystallization and porosity of ZSM-23

Möller

Bein

2011

Microporous and Mesoporous Materials

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“…By comparison, single-crystal XRD analyses have established that the assynthesized MTT structure falls under the space group Pmn2 1 and consists of seven crystallographically distinct T-sites. 22,37 Five of the T-sites occur four times per unit cell and the other two occur twice each, for a total of 24 T-sites per MTT unit cell, as shown in the inset of Figure 2b.…”

Section: ' Introductionmentioning

confidence: 97%

Structure-Directing Roles and Interactions of Fluoride and Organocations with Siliceous Zeolite Frameworks

Shayib

George²,

Seshadri³

et al. 2011

J. Am. Chem. Soc.

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Interactions of fluoride anions and organocations with crystalline silicate frameworks are shown to depend subtly on the architectures of the organic species, which significantly influence the crystalline structures that result. One- and two-dimensional (2D) (1)H, (19)F, and (29)Si nuclear magnetic resonance (NMR) spectroscopy measurements establish distinct intermolecular interactions among F(-) anions, imidazolium structure-directing agents (SDA(+)), and crystalline silicate frameworks for as-synthesized siliceous zeolites ITW and MTT. Different types and positions of hydrophobic alkyl ligands on the imidazolium SDA(+) species under otherwise identical zeolite synthesis compositions and conditions lead to significantly different interactions between the F(-) and SDA(+) ions and the respective silicate frameworks. For as-synthesized zeolite ITW, F(-) anions are established to reside in the double-four-ring (D4R) cages and interact strongly and selectively with D4R silicate framework sites, as manifested by their strong (19)F-(29)Si dipolar couplings. By comparison, for as-synthesized zeolite MTT, F(-) anions reside within the 10-ring channels and interact relatively weakly with the silicate framework as ion pairs with the SDA(+) ions. Such differences manifest the importance of interactions between the imidazolium and F(-) ions, which account for their structure-directing influences on the topologies of the resulting silicate frameworks. Furthermore, 2D (29)Si{(29)Si} double-quantum NMR measurements establish (29)Si-O-(29)Si site connectivities within the as-synthesized zeolites ITW and MTT that, in conjunction with synchrotron X-ray diffraction analyses, establish insights on complicated order and disorder within their framework structures.

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“…Structure analysis of a synthesized tetrapropylammonium silicalite, TPAsilicalite, very convincingly underlined the concept of structure directing by organic templates, the structure-directing agents, SDA. The intimate correspondence of the molecular geometry of the SDA and the channel geometry in the silicate framework of ZSM-5 [ 173 ] certainly inseminated chemists working in the synthesis of zeolites and subsequently lead to the discovery of numerous zeolite materials, the most important ones are ZSM-12 [ 174 ], ZSM-22 [ 175 ], ZSM-23 [ 176 ], and ZSM-48 [ 177 ].…”

Section: Discussionmentioning

confidence: 99%

Structure Analysis in Zeolite Research: From Framework Topologies to Functional Properties

Gies

Marler

2016

Green Chemistry and Sustainable Technology

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The solution and the refi nement of crystal structures of microporous materials are of prime interest for the synthesis and application community in porous solid research. The structure of a material reveals not only the geometry of the bonding network of the rigid framework but also the location of the nonframework constituents responsible for the porosity of the material. Analyzing the structure, therefore, unveils the synthesis protocol including nucleation and growth. The properties related to the porous net correspond to the local structure, i.e., the composition and the geometry of local confi gurations. It thus inspires ideas about possible properties and modifi cations to improve functionality.The chapter is intended to highlight the contribution of crystallographic analysis of microporous materials and in particular porous silicates to the success of this class of materials. It does not survey the continuous growth of materials in the fi eld but show how the insight gained from crystallographic studies acted as catalyst in the further development of the fi eld.

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The framework topology of ZSM-23: A high silica zeolite

Cited by 74 publications

References 5 publications

Crystallization and porosity of ZSM-23

Crystallization and porosity of ZSM-23

Structure-Directing Roles and Interactions of Fluoride and Organocations with Siliceous Zeolite Frameworks

Structure Analysis in Zeolite Research: From Framework Topologies to Functional Properties

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