Preparation of hierarchical SSZ-13 by NH4F etching

Babić, Viktoria; Koneti, Siddardha; Moldovan, Simona; Nesterenko, Nikolai; Gilson, Jean‐Pierre; Valtchev, Valentin

doi:10.1016/j.micromeso.2020.110863

Cited by 13 publications

(23 citation statements)

References 51 publications

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“…Similarly, SSZ‐13 zeolite, which is a type of CHA zeolite, can also undergo etching by NH 4 F to create a hierarchical structure. A method to create hierarchical SSZ‐13 zeolite via NH 4 F aqueous solution etching was reported by Babic et al., [39] and the synthesized zeolite had excellent performance in the n‐propanol dehydration reaction. The peculiarity of microporous zeolites dissolving in the fluoride medium results in low dissolution rates as hydrated difluoride ions pass via small pore channels, resulting in mesopores that start from the surface of the crystal and penetrate further into the crystal.…”

Section: Simultaneous Extraction Of Silicon and Aluminum By Nh4fmentioning

confidence: 99%

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: Simultaneous Extraction Of Silicon and Aluminum By Nh4fmentioning

confidence: 99%

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

et al. 2023

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“…According to the study of Zhu et al [15], SSZ-13 with a double microporous structure can be prepared by adding an F ion into the synthetic system. An aqueous solution of 40 wt.% NH 4 F was also used to prepare etched NH 4 -SSZ-13 and obtain hierarchical derivatives [16]. Therefore, F was added to the reaction system in the form of sodium fluoride, and the influence of the amount of NaF on the product was investigated in this work.…”

Section: Effect Of Sodium Fluoride Addition On the Performance Of Ssz-13 Molecular Sievementioning

confidence: 99%

Growth Study of Hierarchical Pore SSZ-13 Molecular Sieves with Improved CO2 Adsorption Performance

2021

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SSZ-13, with a unique pore structure and excellent thermal stability, showed a potential application in the adsorption and catalysis industry. In this work, Al(NO3)3 was used as an Al source to study the performance and morphology of the zeolite. The zeolite was prepared with an unconventional process by adding an Al source before the structure-directing agent and base. When inorganic oxygen-containing anions were introduced into the unconventional synthesis system, the crystals of the zeolite conform to the unconventional growth mode. The zeolites with large crystals were assembled from small unit nanocrystals. Extending the reaction time, aging time and adding fluoride ions introduced a multistage pore structure on the surface of the molecular sieve, which improved the CO2 adsorption performance. When aging for 24 h, reaction for 96 h, and the amount of fluorine added was 0.05 (F/Si), the sample had the best hierarchical pore structure. The SSZ-13 molecular sieve with an added amount of 0.1 (F/Si) has the highest CO2 adsorption performance. The adsorption amount was 4.55 mmol/g at 1 bar, which is 20.4% higher than that of zeolite SSZ-13 prepared by the conventional process.

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“…34 From a practical point of view and taking into account the environment, inexpensive additives such as NH 4 F (ref. 35 and 36) and urea 15,17 have widely been employed to modify the crystal morphology of different types of zeolites. 22,37…”

Section: Introductionmentioning

confidence: 99%

c-Axis-oriented sheet-like Cu/AEI zeolite contributes to continuous direct oxidation of methane to methanol

Xiao¹,

Wang²,

Nakamura³

et al. 2023

Catal. Sci. Technol.

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Preparation of hierarchical SSZ-13 by NH4F etching

Cited by 13 publications

References 51 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

Growth Study of Hierarchical Pore SSZ-13 Molecular Sieves with Improved CO2 Adsorption Performance

c-Axis-oriented sheet-like Cu/AEI zeolite contributes to continuous direct oxidation of methane to methanol

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