Synthesis of highly b-oriented zeolite MFI films by suppressing twin crystal growth during the secondary growth

Li, Xianming; Peng, Yong; Wang, Zhengbao; Yan, Yushan

doi:10.1039/c1ce05094j

Cited by 57 publications

(50 citation statements)

References 32 publications

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“…[25] In this work, we therefore first tried the synthesis with ac omposition of 0.1 TPABr:SiO 2 :165 H 2 O (TPA + /Si = 0.1) for the secondary growth. [25] In this work, we therefore first tried the synthesis with ac omposition of 0.1 TPABr:SiO 2 :165 H 2 O (TPA + /Si = 0.1) for the secondary growth.…”

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confidence: 99%

“…Figure 1p resents the SEM images of the b-oriented MFI zeolite seed layer on ag lass plate prepared by hand-rubbing ( Figure 1a)and the evolution of the zeolite film morphology along with the crystallization time (Figure 1b-d). [8,25] Due to the aggregation of undissolved fumed silica during hydrothermal synthesis,asemi-solid gel was formed after crystallization. Acontinuous and twinfree b-oriented zeolite film can be achieved when the time is prolonged to 24 h( Figure 1d).…”

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Fabrication of b‐Oriented MFI Zeolite Films under Neutral Conditions without the Use of Hydrogen Fluoride

et al. 2015

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The fabrication of MFI zeolite films with particular b-axis orientation is especially fascinating.Unlike the conventional alkaline or hydrofluoric acid (HF) assisted neutral synthesis route,h ere we develop an ovel neutral synthesis solution system of TPABr/fumed silica/H 2 Owithout the use of HF and successfully synthesize highly b-oriented MFI zeolite films on glass-plate substrates by secondary growth. The localized weak alkaline environment created by the dissolved Na 2 Os pecies from the substrate is identified as the key factor for the depolymerization of fumed silica and subsequently the in-plane growth of zeolite seed layers.C ontinuous b-oriented MFI films can also be synthesized on other substrates in the presence of ag lass plate or at race amount of NaOH, which making our neutral synthesis route promising for the direct synthesis of MFI zeolite films and membranes on various substrates.

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Fabrication of b‐Oriented MFI Zeolite Films under Neutral Conditions without the Use of Hydrogen Fluoride

et al. 2015

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“…They also found that high-quality b -oriented MFI-type zeolite fi lms could be obtained by microwave synthesis on the base of the above pretreatment method [ 54 ]. Wang et al found that twin growth of a b -oriented MFI seed layer could be effectively suppressed by decreasing the TPA + / Si ratio in the secondary synthesis solution to a certain value (e.g., <0.01) [ 55 ].…”

Section: Oriented Mfi-type Zeolite Films and Membranesmentioning

confidence: 97%

“…The rub coating is a simple and effective way to coat zeolite seeds on the support surface, especially defective porous supports because zeolite seeds can fi ll the defect pores in the support by rub coating. A b -oriented MFItype seed layer can also be prepared by rub coating coffi n-shaped MFI-type zeolite seed crystals on dense supports (glass slides, silicon wafers, and metal plates) [ 55 ]. Wang et al developed a novel seeding method, dip coating-wiping seeding, for ceramic hollow fi ber supports [ 29 ].…”

Section: Seeded Growthmentioning

confidence: 99%

Zeolite Thin Films and Membranes: From Fundamental to Applications

Wang

Yan

2016

Green Chemistry and Sustainable Technology

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Zeolite fi lms and membranes have extensively been investigated since 1992. Many new preparation methods and concepts have been developed, such as microwave synthesis, intergrowth supporting substances, covalent linker synthesis, inner-side synthesis, fl uoride-mediated synthesis, variable-temperature synthesis, masking technique, counter-diffusion secondary growth, and pore-plugging synthesis. The remarkable progress made in the preparation has stimulated many application researches of zeolite fi lms and membranes, such as dehydration of various organic solvents, organics extraction from organic/water mixtures, separation of organic mixtures, gas separation, oil-water separation, desalination of seawater, membrane reactors, membrane microreactors, low-k materials, corrosion-resistant materials, sensors, fuel cells, and batteries. The recent progress in preparation and applications of zeolite membranes from 2000 has been summarized in this chapter.

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“…[15] To solve this problem, rapid thermal processing [11c] and molecular layer deposition [16] have been reported to fabricate defect-free molecular-sieve membranes.H owever, the complexity of those methods limits their widespread application in industry.…”

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In Situ Electrochemical Synthesis of Oriented and Defect‐Free AEL Molecular‐Sieve Films Using Ionic Liquids

Chu

Cai

et al. 2015

Angew Chem Int Ed

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Simply preparing oriented and defect-free molecular-sieve films have been a long-standing challenge both in academia and industry. Most of the early works focus on the careful and multiple controls of the seeds layer or synthesis conditions. Herein, we report a one-step in situ electrochemical ionothermal method that combines a controllable electric field with ionic liquids. We demonstrate that an in-plane oriented and defect-free AEL (one molecular-sieve framework type) molecular-sieve film was obtained using an Al electrode as the Al source. The excellent corrosion-resistant performance of the film makes this technology promising in multiple applications, such as anti-corrosion coatings.

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Synthesis of highly b-oriented zeolite MFI films by suppressing twin crystal growth during the secondary growth

Cited by 57 publications

References 32 publications

Fabrication of b‐Oriented MFI Zeolite Films under Neutral Conditions without the Use of Hydrogen Fluoride

Fabrication of b‐Oriented MFI Zeolite Films under Neutral Conditions without the Use of Hydrogen Fluoride

Zeolite Thin Films and Membranes: From Fundamental to Applications

In Situ Electrochemical Synthesis of Oriented and Defect‐Free AEL Molecular‐Sieve Films Using Ionic Liquids

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