The framework topology of ZSM-48: A high silica zeolite

Schlenker, J.L.; Rohrbaugh, Wayne J.; Chu, P.; Valyocsik, E.W.; Kokotailo, G. T.

doi:10.1016/0144-2449(85)90124-1

Cited by 128 publications

(74 citation statements)

References 7 publications

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“…All reflections inconsistent with both C-and I-centering are quite weak suggesting ideal Cmcm (UUDD or DDUU) or Imma (UDUD or DUDU) symmetry. These structures are characterized by non-intersecting ten-ring channels whose ideal dimensions are (5.3 × 5.6) × 10 -10 m [91]. In contrast to other high-silica zeolites, there is no IUPAC structure code assigned to ZSM-48 and related zeolites because they are structural mixtures.…”

Section: N-paraffin Selective Hydroisomerization On Bifunctional Zsm-mentioning

confidence: 99%

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Fischer-Tropsch Waxes UpgradingviaHydrocracking and Selective Hydroisomerization

Bouchy

Hastoy

Guillon

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

236

181

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Résumé -Valorisation des cires de Fischer-Tropsch par hydrocraquage et hydroisomérisation sélective -Ces dernières années, la production de coupes hydrocarbonées à partir de différentes sources par le procédé Fischer-Tropsch a connu un sensible regain d'intérêt. Les coupes hydrocarbonées paraffiniques produites par la réaction de Fischer-Tropsch peuvent être valorisées en base carburants (distillats moyens) ou éventuellement en base huiles de haute qualité. Dans chaque cas, cette étape de valorisation implique l'utilisation de catalyseurs bifonctionnels d'hydrocraquage, pour la production de carburants, ou d'hydroisomérisation sélective, pour la production de base huiles. Les deux types de catalyseurs sont constitués d'une fonction hydro/déshydrogénante et d'une fonction acide; cependant, selon l'application visée, la fonction acide doit respecter des critères sensiblement différents. Une rapide revue des mécanismes et catalyseurs d'hydrocraquage constitue la première partie de cet article. Une attention particulière est portée à la spécificité des charges paraffiniques issues du procédé Fischer-Tropsch comparativement à des charges plus conventionnelles ainsi qu'à l'impact potentiel des composés oxygénés présents dans ces charges sur les performances du catalyseur d'hydrocraquage. La seconde partie de cet article est consacrée aux mécanismes et catalyseurs d'hydroisomérisation sélective. Nous illustrons notamment comment la topologie de la porosité du solide acide constitue un paramètre clé pour gouverner la sélectivité du catalyseur d'hydroisomérisation sélective. Abstract -Fischer-Tropsch Waxes Upgrading via Hydrocracking and Selective Hydroisomerization -In recent years, the production of hydrocarbon cuts from various sources via the Fischer-Tropsch process has lived a renewed interest. Paraffinic cuts produced via the Fischer-Tropsch reaction can be upgraded either to liquid fuels (middle distillates) or to lubricant base oil of high quality. The first kind of upgrading involves the use of a hydrocracking catalyst whereas for the second kind of upgrading

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Section: N-paraffin Selective Hydroisomerization On Bifunctional Zsm-mentioning

confidence: 99%

“…12). Lobo et al traced some residual differences between the experimental and simulated XRD patterns, assuming the original description of the disorder given by Schlenker et al [91], was insufficient.…”

Section: N-paraffin Selective Hydroisomerization On Bifunctional Zsm-mentioning

confidence: 99%

Fischer-Tropsch Waxes UpgradingviaHydrocracking and Selective Hydroisomerization

Bouchy

Hastoy

Guillon

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

236

181

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“…Lobo et al [37] found that although the experimental PXRD pattern and simulated PXRD pattern based on a random intergrowth of the two polytypes have a fairly good agreement, there are still some differences suggesting that the model proposed by Schlenker et al [36] may not capture some important features. They presented a new description of the disorder based on different connections of the 10-ring channels.…”

Section: Zsm-48 ( * Mre)mentioning

confidence: 99%

“…Because of the similarity of the a and b parameters between ZSM-48 and ferrierite [89], a structure model of ZSM-48 based on the ferrierite sheet (Fig. 9a) was derived [36]. Different up (U) and down (D) configurations of the four independent T-atoms in the ferrierite sheets gave rise to 28 polytypes with four different space groups.…”

Section: Zsm-48 ( * Mre)mentioning

confidence: 99%

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Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

Willhammar¹,

Zou²

2013

Zeitschrift für Kristallographie - Crystalline Materials

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Abstract. Intergrowth and stacking disorders are often found in minerals and synthetic zeolites and inorganic openframeworks. Structure elucidation of stacking disorders in these materials have been difficult and structure solution of stacking disorders in unknown zeolites and open-frameworks has been challenging. There exist no standard methods for structure analysis of such disordered materials. In this review we present various stacking disorders and intergrowth in a number of representative zeolite families containing stacking disorders. These include zeolite beta, SSZ-26/SSZ-33, ITQ-39, ABC-6, ZSM-48, SSZ-31, UTD-1, faujasite FAU/EMT, pentasil ZSM-5/ZSM-11, ITQ-13/ITQ-34, ITQ-22/ITQ-38 etc. Stacking disorders in open-frameworks containing mixed coordinations, including titanosilicates ETS-10 and ETS-4, and the silicogermanate SU-JU-14 are also described. Various crystallographic methods used for solving disordered structures are summarized. The methods include powder X-ray diffraction (PXRD), electron diffraction, high resolution transmission electron microscopy (HRTEM), and single-crystal X-ray diffraction. Examples of model building combined with simulations of PXRD and single crystal X-ray diffraction to verify the structure models are given.

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