Gel‐Free Secondary Growth of Uniformly Oriented Silica MFI Zeolite Films and Application for Xylene Separation

Pham, Tung Cao Thanh; Nguyễn, Thanh Phương; Yoon, Kyung Byung

doi:10.1002/anie.201301766

Cited by 146 publications

(108 citation statements)

References 36 publications

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“…[33,34] Here, the silica source is not externally introduced but comes from the substrate. Nanosheet coatings deposited on silicon substrates with a 50 nm thermally-grown oxide (which acts as the silica source) were spin-coated with a very dilute TPAOH solution and heated to a high temperature (220 8C) for 72 h. Figure 5 c shows a top view SEM image of a representative film after gel-less secondary growth.…”

Section: Methodsmentioning

confidence: 99%

2D Zeolite Coatings: Langmuir–Schaefer Deposition of 3 nm Thick MFI Zeolite Nanosheets

et al. 2015

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Stable suspensions of zeolite nanosheets (3 nm thick MFI layers) were prepared in ethanol following acid treatment, which partially removed the associated organic structure-directing agent. Nanosheets from these suspensions could then be dispersed at the air-water interface and transferred to silicon wafers using Langmuir-Schaefer deposition. Using layer-by-layer deposition, control on coating thickness was demonstrated. In-plane X-ray diffraction (XRD) revealed that the deposited nanosheets contract upon calcination similar to bulk MFI crystals. Different methods for secondary growth resulted in preferentially oriented thin films of MFI, which had sub-12-nm thickness in certain cases. Upon calcination, there was no contraction detectable by in-plane XRD, indicating well-intergrown MFI films that are strongly attached to the substrate.

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Section: Methodsmentioning

confidence: 99%

2D Zeolite Coatings: Langmuir–Schaefer Deposition of 3 nm Thick MFI Zeolite Nanosheets

et al. 2015

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“…5 In a recent work, a 200 nm thick b-oriented MFI membrane on porous silica support was obtained by manual assembly followed by gel-free secondary growth. 7 Fig. 2a and b show the seed layer generated by manual assembly.…”

Section: Tsapatsismentioning

confidence: 99%

“…6 Further, secondary growth of these seed layers has advanced through novel methods such as gel-free growth 7 and minimization of twinning. 8 These and other developments have enabled the formation of sub-1 mm zeolite membranes.…”

Section: Introductionmentioning

confidence: 99%

Zeolite membranes – a review and comparison with MOFs

et al. 2015

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aThe latest developments in zeolite membranes are reviewed, with an emphasis on the synthesis techniques, including seed assembly and secondary growth methods. This review also discusses the current industrial applications of zeolite membranes, the feasibility of their use in membrane reactors and their hydrothermal stability. Finally, zeolite membranes are compared with metal-organic framework (MOF) membranes and the latest advancements in MOF and mixed matrix membranes are highlighted.

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“…[14,15] Such crystals have been synthesized mostly in alayered form (multi-layered lamella) for applications in adsorption and catalysis. Following this demonstration, improvements in exfoliation [21] and gel-free secondary growth [22,23] led to better separation performances,while the discovery of non-thermal de-templation by piranha treatment allowed selective membrane formation on porous polymer supports. Following this demonstration, improvements in exfoliation [21] and gel-free secondary growth [22,23] led to better separation performances,while the discovery of non-thermal de-templation by piranha treatment allowed selective membrane formation on porous polymer supports.…”

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confidence: 98%

para‐Xylene Ultra‐selective Zeolite MFI Membranes Fabricated from Nanosheet Monolayers at the Air–Water Interface

et al. 2017

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The control of membrane morphology and microstructure is crucial to improve the separation performance of molecular-sieve membranes. This can be enabled by making thin, dense, and uniform seed-crystal coatings, which are then intergrown into continuous membranes. Herein, we show a novel and simple floating particle coating method can give closely packed monolayers of zeolite nanosheets on nonporous or porous supports. The zeolite nanosheet monolayer is formed at the air-water interface in a conical Teflon trough. As the water in the trough is drained, the monolayer is deposited on a support placed below. Membranes prepared by gel-free secondary growth of the nanosheets deposited by this method show unprecedented ultra-selective performance for separation of para- from ortho-xylene (separation factor >10 000).

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Gel‐Free Secondary Growth of Uniformly Oriented Silica MFI Zeolite Films and Application for Xylene Separation

Cited by 146 publications

References 36 publications

2D Zeolite Coatings: Langmuir–Schaefer Deposition of 3 nm Thick MFI Zeolite Nanosheets

2D Zeolite Coatings: Langmuir–Schaefer Deposition of 3 nm Thick MFI Zeolite Nanosheets

Zeolite membranes – a review and comparison with MOFs

para‐Xylene Ultra‐selective Zeolite MFI Membranes Fabricated from Nanosheet Monolayers at the Air–Water Interface

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