Isomorphous substitution of Al, Fe, B, and Ge into MFI-zeolite membranes

Tuấn, Vũ Anh; Falconer, John L.; Noble, Richard D.

doi:10.1016/s1387-1811(00)00299-7

Cited by 87 publications

(81 citation statements)

References 34 publications

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“…Further advantage is the availability of experimental and simulation data for comparison. [16][17][18][19]23,26,28 2.1. Zeolite Models.…”

Section: Methodsmentioning

confidence: 99%

“…25 Moreover, the linear/branched separation selectivities increase with increasing nonframework cation density inside MFI-type channels. 26 Finally, another factor of interest in adsorption selectivity is the temperature. For purely siliceous MFI, the n-butane/isobutane separation selectivity decreases with increasing temperature.…”

Section: Introductionmentioning

confidence: 99%

“…23,27 In the presence of nonframework cations it increases with increasing temperature and has a maximum at a certain temperature. 26,28 The aim of this work is 2-fold. First we study the effect of charges in the crystal structure, cation locations, and cation loading on adsorption properties of alkanes in MOR-and MFItype zeolites.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Non-framework Sodium Cations on the Adsorption of Alkanes in MFI- and MOR-Type Zeolites

2002

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Molecular simulations were performed for the adsorption of methane, ethane, and propane in MFI-and MORtype zeolites with various nonframework sodium and framework aluminum densities. The position of the nonframework sodium cations determined by Monte Carlo simulations is in agreement with positions determined by X-ray diffraction. The position and density of the sodium and aluminum atoms in the zeolite have a large influence on the adsorption of alkanes. The computed adsorption isotherms and Henry coefficients agree well with those obtained experimentally. Finally, we show that Configurational Bias Monte Carlo (CBMC) simulations are able to provide a better understanding of the effect of nonframework sodium on the selective adsorption of binary mixtures of isomers by these structures. Our results show that increasing the nonframework sodium density in MFI-type zeolites increasingly blocks the intersections and thereby increases the selectivity of MFI-type zeolites for adsorbing linear alkanes. By contrast, increasing the nonframework sodium density in MOR-type zeolites increases the number of sites favorable for adsorbing small linear alkanes.

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“…Further advantage is the availability of experimental and simulation data for comparison. [16][17][18][19]23,26,28 2.1. Zeolite Models.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Influence of Non-framework Sodium Cations on the Adsorption of Alkanes in MFI- and MOR-Type Zeolites

2002

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“…15 Moreover, experiments show that the linear/branched separation selectivity increases with increasing nonframework cation density inside MFI-type channels. 13,[26][27][28] To the best of our knowledge, only a few groups have performed molecular simulations in MFI-type structures with alkali metal nonframework cations. [29][30][31][32][33] This may be because the commercial interest for alkali-exchanged MFI zeolites has been less than that for LTA and FAU (structures used to separate oxygen from air in pressure swing adsorption 34 ).…”

Section: Introductionmentioning

confidence: 99%

Simulating the Effect of Nonframework Cations on the Adsorption of Alkanes in MFI-type Zeolites

et al. 2003

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We performed configurational-bias Monte Carlo (CBMC) simulations for the adsorption of methane, ethane, propane, butane, and isobutane in MFI-type zeolites with different concentration and nature of nonframework cations. Additional molecular simulations for a mixture of butane/isobutane in these MFI-type zeolites were carried out. The effect of the contentsdensity and naturesof nonframework cations was systematically analyzed, and our results show that even though all of the MFI-type zeolites are structurally similar, differences in the size and concentration of the nonframework cations lead to differences in their adsorptive properties and selectivity performance. For a given cation, the adsorption of alkanes in MFI increases with decreasing the nonframework cation concentration, and for a given Si/Al ratio, the adsorption of alkanes in MFI increases with decreasing atomic weight of the nonframework cation.

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“…It is essential in TPA-free membrane preparation. Aluminum can be substituted by other elements such as Fe, B or Ge, allowing further flexibility and modulation of permeation properties [25,26].…”

Section: Synthesis Mixturementioning

confidence: 99%

Zeolite Membranes for Gas and Liquid Separations

Gavalas

2006

Materials Science of Membranes for Gas and Vapor Separation

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Isomorphous substitution of Al, Fe, B, and Ge into MFI-zeolite membranes

Cited by 87 publications

References 34 publications

The Influence of Non-framework Sodium Cations on the Adsorption of Alkanes in MFI- and MOR-Type Zeolites

The Influence of Non-framework Sodium Cations on the Adsorption of Alkanes in MFI- and MOR-Type Zeolites

Simulating the Effect of Nonframework Cations on the Adsorption of Alkanes in MFI-type Zeolites

Zeolite Membranes for Gas and Liquid Separations

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