A bi-model mesoporous single-crystalline hierarchical zeolite

Shao, Yuanchao; Wang, Dezhi; Xu, Yi‐Tong; Tatsumi, Takashi; Wang, Jingui

doi:10.1016/j.matlet.2021.130073

Cited by 6 publications

(8 citation statements)

References 9 publications

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“…Shao and colleagues, for instance, attained a foam-like hierarchical zeolite containing multiple hollow nanocrystals with identical lattice orientation, using a mixture of triethanolamine and tetra propylammonium hydroxide in the aqueous solution. [6] This zeolite stands apart due to its two mesopores types: meso-voids positioned between nanocrystals and mesocavities located within the hollow nanocrystals, linked via micropore walls less than 20 nm in size. Furthermore, the zeolite possessed a hierarchical porosity, good hydrophobicity and high titanium content.…”

Section: Organic Alkalimentioning

confidence: 99%

“…Mixed basic aqueous solutions have also proved suitable for synthesizing hierarchical zeolites, according to previous studies. Shao and colleagues, for instance, attained a foam‐like hierarchical zeolite containing multiple hollow nanocrystals with identical lattice orientation, using a mixture of triethanolamine and tetra propylammonium hydroxide in the aqueous solution [6] . This zeolite stands apart due to its two mesopores types: meso‐voids positioned between nanocrystals and meso‐cavities located within the hollow nanocrystals, linked via micropore walls less than 20 nm in size.…”

Section: Desilication By Alkalimentioning

confidence: 99%

“…[4,5] Developing techniques for producing zeolites with large pore structures is a crucial focus of zeolite research. [6] The introduction of mesopores is a current and noteworthy area of zeolites.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, improving the accessibility of large‐diameter molecules to active sites and reducing the impact of diffusion limitations are crucial [4,5] . Developing techniques for producing zeolites with large pore structures is a crucial focus of zeolite research [6] . The introduction of mesopores is a current and noteworthy area of zeolites.…”

Section: Introductionmentioning

confidence: 99%

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Methods for Preparing Hierarchical Zeolites by Chemical Etching and Their Catalytic Applications: A Review

et al. 2023

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Zeolites are widely used in petrochemical processes and refineries due to their well‐ordered microporous network and large surface area. However, the diffusion of reactants and products is hampered by the narrow microporous channels, causing limitations. To overcome this challenge, modifying the pore structure is crucial, and the chemical etching technique is a powerful tool that introduces mesopores and macropores, consequently enhancing mass transfer and accessibility. Diverse chemical etching methods have been invented, including exposure to both acids (organic/inorganic acids), alkali (organic/inorganic alkali), and neutral etchants (e. g., ammonium fluoride). This review summarizes and assesses the chemical etching methods and their relevance to catalytic cracking reactions, methanol to hydrocarbons (MTH), and biomass conversion. The potential of zeolites with modified pore structures has motivated researchers to develop novel methods to tackle the practical challenges associated with their applications.

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Section: Organic Alkalimentioning

confidence: 99%

Section: Desilication By Alkalimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Methods for Preparing Hierarchical Zeolites by Chemical Etching and Their Catalytic Applications: A Review

et al. 2023

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“…[4,[7][8][9][10][11][17][18][19][20][21][22] The former is destructive via steaming, leaching, or etching. [23][24][25][26][27][28] The latter relies on mesoporogens such as hard templates, supramolecular templates, and surface silanization. [29][30][31][32][33][34][35][36] However, the generated hierarchical zeolites typically present isolated mesopores, and the intrapenetrated hierarchical zeolites are intensely depended on highly customized and expensive organic mesoporogens.…”

Section: Introductionmentioning

confidence: 99%

Constructing Intrapenetrated Hierarchical Zeolites with Highly Complete Framework via Protozeolite Seeding

Liu,

Wang,

et al. 2023

Angew Chem Int Ed

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Creation of intrapenetrated mesopores with open highway from external surface into the interior of zeolite crystals are highly desirable that can significantly improve the molecular transport and active sites accessibility of microporous zeolites to afford enhanced catalytic properties. Here, different from traditional zeolite‐seeded methods that generally produced isolated mesopores in zeolites, nanosized amorphous protozeolites with embryo structure of zeolites were used as seeds for the construction of single‐crystalline hierarchical ZSM‐5 zeolites with intrapenetrated mesopores (mesopore volume of 0.51 cm3g‐1) and highly complete framework. In this strategy, in contrast to the conventional synthesis, only a small amount of organic structure directing agents and a low crystallization temperature were adopted to promise the protozeolites as the dominant growth directing sites to induce crystallization. The protozeolite nanoseeds provided abundant nucleation sites for surrounding precursors to be crystallized, followed by oriented coalescence of crystallites resulting in the formation of intrapenetrated mesopores. The as‐prepared hierarchical ZSM‐5 zeolites exhibited ultra‐long lifetime of 443.9 hours and a high propylene selectivity of 47.92 % at a WHSV of 2 h‐1 in the methanol‐to‐propylene reaction. This work provides a facile protozeolite‐seeded strategy for the synthesis of intrapenetrated hierarchical zeolites that are highly effective for catalytic applications.

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Recent Advances in the Synthesis and Application of TS‐1 Zeolite for Green Catalytic Oxidation

Wang,

Duan,

et al. 2024

Advanced Sustainable Systems

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TS‐1 has a unique structure, and TS‐1/H2O2 oxidation system for composition shows excellent catalytic performance in the oxidation of a variety of organic matter. The response conditions of the reaction system are mild, and the ultimate oxidation product is water. It is a typical “green catalytic” system and has received widespread attention from researchers. Here, the synthesis progress of TS‐1 to improve the accessibility and activity of active sites by doping mesoporous and microporous structures into traditional TS‐1 zeolite in recent five years are reviewed, including hydrothermal synthesis, dry gel conversion synthesis, solvent‐free synthesis, microwave assisted synthesis, and isomorphous substitution. Meanwhile, the application of TS‐1/H2O2 system in oxidative desulfurization, ketone ammonia oxidation, olefin epoxidation, and hydroxylation of aromatic hydrocarbons reactions are summarized and discussed. What's more, the reaction mechanism based on TS‐1/H2O2 system is proposed on regarding the isolated skeleton Ti site in titanium‐silicon zeolite as the active central site. Finally, the challenges and future development prospects of TS‐1 zeolite in synthesis and catalytic applications are predicted.

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A bi-model mesoporous single-crystalline hierarchical zeolite

Cited by 6 publications

References 9 publications

Methods for Preparing Hierarchical Zeolites by Chemical Etching and Their Catalytic Applications: A Review

Methods for Preparing Hierarchical Zeolites by Chemical Etching and Their Catalytic Applications: A Review

Constructing Intrapenetrated Hierarchical Zeolites with Highly Complete Framework via Protozeolite Seeding

Recent Advances in the Synthesis and Application of TS‐1 Zeolite for Green Catalytic Oxidation

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