The orthorhombic/monoclinic transition in single crystals of zeolite ZSM-5

Koningsveld, H. van; Jansen, J.C.; Bekkum, H. van

doi:10.1016/0144-2449(87)90099-6

Cited by 173 publications

(180 citation statements)

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“…In particular, a reversible temperature-induced phase transition from monoclinic (P2 1 /n) to orthorhombic (Pnma) space group (s.g.) is observed as the result of the relative shift of (0 1 0) pentasil layers in the c direction [6]. In all-silica MFI phases, the transition occurs at about 320 K, while the introduction of aluminum lowers this temperature.…”

Section: Introductionmentioning

confidence: 98%

Elastic behavior of MFI-type zeolites: Compressibility of H-ZSM-5 in penetrating and non-penetrating media

Quartieri¹,

Montagna²,

Arletti³

et al. 2011

Journal of Solid State Chemistry

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High pressure structure Elastic behavior Synchrotron X-ray powder diffraction a b s t r a c tThe elastic behavior of H-ZSM-5 was investigated by in-situ synchrotron X-ray powder diffraction, using both silicone oil (s.o.) and (16:3:1) methanol:ethanol:water (m.e.w.) as ''non-penetrating'' and ''penetrating'' pressure transmitting media, respectively. From P amb to 6.2 GPa the volume reduction observed in s.o. is 16.6%. This testifies that H-ZSM-5 is one of the most flexible microporous materials up to now compressed in s.o. Volume reduction observed in m.e.w. up to 7.6 GPa is 14.6%. A strong increase in the total electron number of the extraframework system, due to the penetration of water/ alcohol molecules in the pores, is observed in m.e.w. This effect is the largest up to now observed in zeolites undergoing this phenomenon without cell volume expansion. The higher compressibility in s.o. than in m.e.w. can be ascribed to the penetration of the extra-water/alcohol molecules, which stiffen the structure and contrast the channel deformations.

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Section: Introductionmentioning

confidence: 98%

Elastic behavior of MFI-type zeolites: Compressibility of H-ZSM-5 in penetrating and non-penetrating media

Quartieri¹,

Montagna²,

Arletti³

et al. 2011

Journal of Solid State Chemistry

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“…To see the limitation of this assumption, let us consider the transition which is observed in the adsorption of benzene or xylene isomers in silicalite. [209][210][211] Olson et al observed a step in the adsorption isotherm for p-xylene at 70°C, a plateau at a loading of four molecules per unit cell with saturation at six molecules per unit cell (see Figure 22). Van Koningsveld showed that at four molecules per unit cell a structural transition of the zeolite framework from the ortho to the para structure occurs.…”

Section: Flexible Latticementioning

confidence: 99%

“…Van Koningsveld showed that at four molecules per unit cell a structural transition of the zeolite framework from the ortho to the para structure occurs. 211 From a molecular simulation point of view, this is a very challenging system to study. A very pragmatic approach was adopted by Snurr et al, 212 who have computed the adsorption isotherms of p-xylene in both the ortho and the para structures of silicalite (see Figure 22).…”

Section: Flexible Latticementioning

confidence: 99%

Molecular Simulations of Zeolites: Adsorption, Diffusion, and Shape Selectivity

2008

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“…Therefore, automated recognition of the diffraction bands by the software could not be performed. Nevertheless, after the bands were selected manually, we were able to index the patterns with an orthorhombic structure of ZSM-5, [27] as shown in Figure 2 d and e. Unambiguous indexing of the patterns is possible if certain diffraction bands, either the {133}-, {804}-, or {151}-type bands, could be recognized. The EBSD patterns could be indexed with the orthorhombic structure both with and without template molecules.…”

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confidence: 99%