Acidic properties of Al-rich ZSM-5 crystallized in strongly acidic fluoride medium

Shi, Diandian; Fu, Guangying; Omran, Ahmed; Haw, Kok‐Giap; Zhu, Lei; Ding, Ruiqin; Lang, Qiaolin; Wang, Songxia; Fang, Qianrong; Qiu, Shilun; Yang, Xiaobo; Valtchev, Valentin

doi:10.1016/j.micromeso.2022.112332

Cited by 7 publications

(2 citation statements)

References 51 publications

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“…The spent Y zeolite catalyst exhibited distinct characteristic diffraction peaks at 6.3°, 10.3°, and 15.9° after long-term use, indicating a well-maintained framework structure. 17 After 6 h of crystallization, the relevant characteristic peaks (2 θ = 7.9° and 8.0°) of ZSM-5 appeared, suggesting that crystallization had already begun within 6 h. The ZSM-5-Y-6 sample was characterized by a mixed phase of MFI and FAU. 18 With an increase in crystallization time to 18 h, the characteristic peak of Y zeolite disappeared and some amorphous phases emerged.…”

Section: Resultsmentioning

confidence: 93%

Synthesis of hierarchical MFI zeolite by interzeolite conversion of spent FAU zeolite for the methanol-to-olefins reaction

Sun,

Yang,

Wen

et al. 2024

Sustainable Energy Fuels

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Section: Resultsmentioning

confidence: 93%

Synthesis of hierarchical MFI zeolite by interzeolite conversion of spent FAU zeolite for the methanol-to-olefins reaction

Sun,

Yang,

Wen

et al. 2024

Sustainable Energy Fuels

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“…In addition, the spectra of as-synthesized samples present an isotropic band at -149 ppm, which could be ascribed to the multiple environments of Fions connected with the framework Si sites, i.e., F x -Si(-OSi) 3 . 32 They take a significant portion of the total Famount, and should not be imputed to unreacted silica or alumina precursors. Rather, connectivity defects, either related to the d4r-unit…”

Section: / 36mentioning

confidence: 99%

The strong SDA/framework interactions and acidity study of high-silica LTA-type zeolites

Pan

et al. 2023

Microporous and Mesoporous Materials

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Selective and Controllable Cracking of Polyethylene Waste by Beta Zeolites with Different Mesoporosity and Crystallinity

Liu,

Dai,

Zheng

et al. 2024

Advanced Science

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Waste plastics bring about increasingly serious environmental challenges, which can be partly addressed by their interconversion into valuable compounds. It is hypothesized that the porosity and acidity of a zeolite‐based catalyst will affect the selectivity and effectiveness, enabling a controllable and selective conversion of polyethylene (PE) into gas‐diesel or lubricating base oil. A series of embryonic, partial‐ and well‐crystalline zeolites beta with adjustable porosity and acidity are prepared from mesoporous SBA‐15. The catalysts and catalytic systems are studied with nuclear magnetic resonance (NMR), X‐ray diffraction (XRD), and adsorption kinetics and catalytic reactions. The adjustable porosity and acidity of zeolite‐beta‐based catalysts achieve a controllable selectivity toward gas‐diesel or lubricating base oil for PE cracking. With a catalyst with mesopores and appropriate acid sites, a fast escape and reduced production of cracking of intermediates are observed, leading to a significant fraction (88.7%) of lubricating base oil. With more micropores, a high acid density, and strong acid strength, PE is multiply cracked into low carbon number hydrocarbons. The strong acid center of the zeolite is confirmed to facilitate significantly the activation of hydrogen (H2), and, an in situ ammonia poisoning strategy can significantly inhibit hydrogen transfer and effectively regulate the product distribution.

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Acidic properties of Al-rich ZSM-5 crystallized in strongly acidic fluoride medium

Cited by 7 publications

References 51 publications

Synthesis of hierarchical MFI zeolite by interzeolite conversion of spent FAU zeolite for the methanol-to-olefins reaction

Synthesis of hierarchical MFI zeolite by interzeolite conversion of spent FAU zeolite for the methanol-to-olefins reaction

The strong SDA/framework interactions and acidity study of high-silica LTA-type zeolites

Selective and Controllable Cracking of Polyethylene Waste by Beta Zeolites with Different Mesoporosity and Crystallinity

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