Twin suppression effect of dihydroxy-benzene isomers during the secondary growth of <i>b</i>-oriented zeolite MFI nanosheet films

Xu, Ruilan; Peng, Yong; Lü, Peng; Miao, Yurun; Duan, Xuekui; Lee, Dennis; Wang, Rui; Wang, Qianqian; Tsapatsis, Michael

doi:10.1039/d2ce01407f

Cited by 5 publications

(4 citation statements)

References 41 publications

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“…Crystal growth rate along the c -axis of MFI zeolites in the films synthesized with different molar amounts of EG, DEG, TEG, and tEG. The growth rate was calculated according to the ref ().…”

Section: Resultsmentioning

confidence: 99%

High-Light-Transmittance and Low-Haze Antifog MFI Zeolite Films Fabricated by Solvothermal Secondary Growth

Wang,

Xu,

Zhang

et al. 2024

Crystal Growth & Design

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Preventing the appearance of fog on transparent glass is an important issue not only in our daily lives but also in scientific research and clinical diagnosis. A zeolite molecular sieve with MFI-type structure was identified as a very promising antifog material. In this work, MFI zeolite films with different microstructures were prepared by the solvothermal secondary growth method using diols including ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG), and tetraethylene glycol (tEG) as solvents. The elimination mechanism of new MFI twin crystals was demonstrated based on scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM) characterizations of the resulting films and the mother solutions. The twin-free MFI films with b-axis preferred channel orientation exhibited both higher light transmittance and lower haze compared with the a-&b-mix-oriented film. The employment of diol solvents facilitated the generation of a surface Si−OH group on the films, leading to the improvement of film hydrophilicity. By taking advantages of the high transparency and hydrophilicity, the b-oriented MFI films synthesized on glass substrate achieved good antifogging performance.

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Section: Resultsmentioning

confidence: 99%

High-Light-Transmittance and Low-Haze Antifog MFI Zeolite Films Fabricated by Solvothermal Secondary Growth

Wang,

Xu,

Zhang

et al. 2024

Crystal Growth & Design

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“…It is well-known that zeolites are often accompanied by competing growth of two-phase zeolites under specific crystallization conditions, resulting in intergrowth zeolites. It is a common strategy to tailor the intergrowth phase ratio by adjusting the gel components through extensive synthetic experience, such as changing the addition and ratio of organic templating agents, , using inorganic templating agents such as Cs + , and adjusting Si/Al, additives or crystal species to assist, etc. However, it is inevitable that the fitting of complex gel components is often tedious and results in high uncertainty. Synthesis process optimization.…”

Section: Synthesis Of Intergrowth Zeolitesmentioning

confidence: 99%

“… Intergrowth zeolites with different phase ratios have more possibilities in catalysis, so the synthesis of intergrowth zeolites with adjustable phase ratios will be one of the main focuses of future work. The main approaches include controlling the type and amount of template, the crystallization temperature and time, and the addition of additives MFI/MEL, FAU/EMT, and Beta zeolites have been prepared with hierarchical structures using special surfactants to facilitate the diffusion of molecules, providing ideas for the exploitation of other intergrowth zeolites. Details are needed to investigate the effect of seeds in the synthesis of intergrowth zeolites.…”

Section: Challenges Opportunities and Outlookmentioning

confidence: 99%

Section: Challenges Opportunities and Outlookmentioning

confidence: 99%

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Intergrowth Zeolites, Synthesis, Characterization, and Catalysis

Wang,

Tong,

Liu

et al. 2023

Chem. Rev.

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Microporous zeolites that can act as heterogeneous catalysts have continued to attract a great deal of academic and industrial interest, but current progress in their synthesis and application is restricted to single-phase zeolites, severely underestimating the potential of intergrowth frameworks. Compared with single-phase zeolites, intergrowth zeolites possess unique properties, such as different diffusion pathways and molecular confinement, or special crystalline pore environments for binding metal active sites. This review first focuses on the structural features and synthetic details of all the intergrowth zeolites, especially providing some insightful discussion of several potential frameworks. Subsequently, characterization methods for intergrowth zeolites are introduced, and highlighting fundamental features of these crystals. Then, the applications of intergrowth zeolites in several of the most active areas of catalysis are presented, including selective catalytic reduction of NOx by ammonia (NH 3 -SCR), methanol to olefins (MTO), petrochemicals and refining, fine chemicals production, and biomass conversion on Beta, and the relationship between structure and catalytic activity was profiled from the perspective of intergrowth grain boundary structure. Finally, the synthesis, characterization, and catalysis of intergrowth zeolites are summarized in a comprehensive discussion, and a brief outlook on the current challenges and future directions of intergrowth zeolites is indicated.

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Atmospheric Pressure Alkaline Etching of MFI Zeolite Under Mild Temperature Toward Hollow Microstructure and Ultralow k Film

Zhang,

Xu,

Wang

et al. 2024

Small Methods

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Constructing a hollow structure inside zeolite is very helpful for improving its performance. Unlike the conventional alkaline etching technique usually operated at high temperature (typically 170 °C) and high pressure (autogenerated in autoclave), here, it is discovered that zeolite MFI nano‐box can be achieved under mild etching conditions of atmospheric pressure and low temperature of 80 °C, making it very attractive for energy conservation and practical applications. A hollow‐structure formation mechanism of protection‐dissolution etching is demonstrated by characterizing MFI crystals obtained under different etching time, temperature, and etchant concentration. The utilization of template agent‐free secondary growth leads to the successful fabrication of a continuous b‐oriented hierarchical MFI zeolite film with desired microstructure of embedded cavities and opened pores. The advantage of the newly constructed film is highlighted by its ultralow k value accompanied with high mechanical strength.

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Twin suppression effect of dihydroxy-benzene isomers during the secondary growth of b-oriented zeolite MFI nanosheet films

Abstract: The presence of MFI twin crystals on b-axis oriented zeolite MFI nanosheet films was suppressed by adding dihydroxy-benzene isomers in the synthesis mixture. The resulting nanosheet films exhibited good intergrowth...

Cited by 5 publications

References 41 publications

High-Light-Transmittance and Low-Haze Antifog MFI Zeolite Films Fabricated by Solvothermal Secondary Growth

High-Light-Transmittance and Low-Haze Antifog MFI Zeolite Films Fabricated by Solvothermal Secondary Growth

Intergrowth Zeolites, Synthesis, Characterization, and Catalysis

Atmospheric Pressure Alkaline Etching of MFI Zeolite Under Mild Temperature Toward Hollow Microstructure and Ultralow k Film

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