Effects of adsorption-induced microstructural changes on separation of xylene isomers through MFI-type zeolite membranes

O’Brien-Abraham, Jessica; Kanezashi, Masakoto; Lin, Jerry Y S

doi:10.1016/j.memsci.2008.04.023

Cited by 44 publications

(32 citation statements)

References 25 publications

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“…Zeolites, having subnanometer-scale pores lined with chemically active surfaces, are widely used as catalysts, sorbents, ion exchangers, molecular separation membranes [6][7][8][9][10][11][12][13][14] , membrane reactors 15 , and many others 1 . Although each zeolite has well-defined pore sizes and shapes, they could undergo a significant degree of distortion if the zeolite crystal is situated under a strongly strained condition.…”

Section: These Observed Structures Could Explain the Loss Of Efficienmentioning

confidence: 99%

Core–shell strain structure of zeolite microcrystals

et al. 2013

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Zeolites are crystalline aluminosilicate minerals featuring a network of 0.3-1.5-nm-wide pores, used in industry as catalysts for hydrocarbon interconversion, ion exchangers, molecular sieves and adsorbents. For improved applications, it is highly useful to study the distribution of internal local strains because they sensitively affect the rates of adsorption and diffusion of guest molecules within zeolites. Here, we report the observation of an unusual triangular deformation field distribution in ZSM-5 zeolites by coherent X-ray diffraction imaging, showing the presence of a strain within the crystal arising from the heterogeneous core-shell structure, which is supported by finite element model calculation and confirmed by fluorescence measurement. The shell is composed of H-ZSM-5 with intrinsic negative thermal expansion whereas the core exhibits a different thermal expansion behaviour due to the presence of organic template residues, which usually remain when the starting materials are insufficiently calcined. Engineering such strain effects could have a major impact on the design of future catalysts.

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Section: These Observed Structures Could Explain the Loss Of Efficienmentioning

confidence: 99%

Core–shell strain structure of zeolite microcrystals

et al. 2013

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“… Membrane response as a function of p ‐xylene feed concentration during PV of an equimolar p / o ‐xylene feed at 298 K. Adapted from Ref. 172. This figure is available in colour online at http://www.apjChemEng.com.…”

Section: Mfi‐type Zeolite Membranes For Xylene Isomer Separationmentioning

confidence: 99%

Separation and isomerization of xylenes using zeolite membranes: a short overview

Daramola

Burger

Pera‐Titus

et al. 2010

Asia-Pacific J Chem Eng

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During the last 30 years, there has been a great evolution in p-xylene production technology, with many equipment improvements being instituted in the industry. Typically, these improvements bring economic as well as processing advantages to the producers. Such developments are vital, as the capital costs for process equipment to separate xylene isomers, especially into highly purified p-xylene, still remain very high. In view of this, research efforts have recently focused on the development of zeolite membranes for the separation and production of p-xylene, the precursor for the production of terephthalic acid, for which the current p-xylene world demand stands at about 86% of the production. Over a list of about 200 references, this review reports on the present state-of-the-art in p-xylene separation from lesser used isomers (o-and m-xylene) by means of MFI-type zeolite membranes, and on the most recent achievements in o/m-xylene isomerization to p-xylene using extractor-type catalytic membrane reactors.  2009

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“…At xylene vapour pressures higher than 2.3 kPa, however, MX passage appears to be promoted, contributing therefore to the observed decrease of the PX/MX separation factor. This observation might be attributed to a distorsion of the MFI framework at high xylene coverage, promoting single-file diffusion within zeolite channels [31]. As a result, the slower permeating isomers (i.e.…”

Section: Influence Of the Feed Total Pressure On The Px Separation Pementioning

confidence: 99%

Nanocomposite MFI-alumina hollow fibre membranes prepared via pore-plugging synthesis: Influence of the porous structure of hollow fibres on the gas/vapour separation performance

Deng

Nicolas

Daramola

et al. 2010

Journal of Membrane Science

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Effects of adsorption-induced microstructural changes on separation of xylene isomers through MFI-type zeolite membranes

Cited by 44 publications

References 25 publications

Core–shell strain structure of zeolite microcrystals

Core–shell strain structure of zeolite microcrystals

Separation and isomerization of xylenes using zeolite membranes: a short overview

Nanocomposite MFI-alumina hollow fibre membranes prepared via pore-plugging synthesis: Influence of the porous structure of hollow fibres on the gas/vapour separation performance

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