HZSM-5 zeolite cross-linked with ultrathin siliceous layer for intensifying catalytic cracking and diffusion of n-butane

Guan, Linjie; Huang, Chengming; Han, Dingmei; He, Binbin; Zhu, Linhua; He, Dedong; Mei, Yi; Zu, Yun

doi:10.1016/j.fuel.2022.123252

Cited by 12 publications

(5 citation statements)

References 57 publications

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“…possess narrower FWHM . Generally speaking, large and regular crystal sizes will lead to better R.C . and small FWHM values owing to suppressed X-ray scattering that will interfere with the diffraction signals.…”

Section: Resultsmentioning

confidence: 99%

Identifying the Location of Real Active Sites in ZSM-5 Zeolites for Tetralin Conversion into Light Aromatics

Guan

Zhang

et al. 2023

Energy Fuels

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Light cycle oil (LCO) can no longer be used as fuel additives for diesel upgrading, and hence, the catalytic cracking of LCO into light aromatics has become an urgent job for its proper utilization. In this work, toward the rational design of catalysts for LCO cracking, various ZSM-5 zeolites were prepared and utilized in tetralin (as a presentative compound of LCO) cracking to determine the essential locations of active sites. Results show that tetralin could hardly penetrate into the micropores constituted by the 10-member-ring channels of ZSM-5 owing to the large molecular size. Instead, this reaction majorly proceeds via the acid sites residing on the external surfaces rather than those in the intracrystal mesopores. Meanwhile, the external acid sites also possess the advantage of rapid diffusion, which significantly decreases the formation of coke and promotes the catalytic lifetime. Consequently, the morphologies of ZSM-5 play a pivotal role in catalytic performances, among which the nanosized ZSM-5 catalyst was the most outstanding candidate, exhibiting a tetralin conversion of 87.0%, benzene/toluene/xylene total yields of 51.3%, and a lifetime of 22 h as a result of the most abundant external acid sites. These findings disclosed the locations of real active sites in ZSM-5 zeolites in the cracking of tetralin and developed methods to enhance the catalytic performances, which are helpful for the rational design of catalysts for tetralin cracking.

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Section: Resultsmentioning

confidence: 99%

Identifying the Location of Real Active Sites in ZSM-5 Zeolites for Tetralin Conversion into Light Aromatics

Guan

Zhang

et al. 2023

Energy Fuels

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“…It can be found from Table S2 † that Zr-FDCA-15HPWO contained a large amount of LA (55.02 mmol g −1 ) and a small amount of BA (7.55 mmol g −1 ), which was mainly manifested as strong acid (39.21 mmol g −1 ), and the synergistic effect of LA and BA sites was conducive to activating the functional group and promoting the reaction. 52 The unique acidic properties of Zr-FDCA-15HPWO were probably affected by the interaction between zirconium species and FDCA. In this sense, XPS was performed to investigate the surface chemical composition and elemental chemical status (Fig.…”

Section: Resultsmentioning

confidence: 99%

Catalytic transfer hydrogenation of levulinic acid to gamma-valerolactone over a zirconium-based FDCA hybrid: insights into the effect of heteropoly acids

Huang

Cheng

Liu

et al. 2023

Sustainable Energy Fuels

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“…Currently, how to convert iso-butane into high value-added products as much as possible in the catalytic cracking reaction more than just light olefins remains a challenge. In pace with the development of technology, the deep processing of C 4 alkanes has gradually diversified, greatly developing the utilization value of C 4 alkanes. − Among them, the catalytic cracking process using iso-butane as the raw material to produce light olefins and BTX is an effective way to improve the utilization value of iso-butane. For the catalytic cracking of iso-butane, selecting an appropriate catalyst is crucial.…”

Section: Introductionmentioning

confidence: 99%

ZSM-5 Zeolite-Encapsulated Pt-ZnO Bimetallic Catalysts for the Catalytic Cracking of Iso-Butane

Zhang,

Wu,

Wang

et al. 2023

Ind. Eng. Chem. Res.

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In recent years, the efficient utilization of light alkanes, especially iso-butane and n-butane, has attracted increasing attention. Here, a series of ZSM-5 zeolite-encapsulated Pt-xZnO (x = 0, 0.05, 0.1, 0.25, 0.5, 1) catalysts were prepared via a one-pot hydrothermal method. The dispersion of metal particles, state of metal species, structure, and acidity of catalysts were confirmed by multiple physical and chemical characterizations. The catalysts were used in the catalytic cracking of iso-butane; the conversion of isobutane would increase with the increase of ZnO content.

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HZSM-5 zeolite cross-linked with ultrathin siliceous layer for intensifying catalytic cracking and diffusion of n-butane

Cited by 12 publications

References 57 publications

Identifying the Location of Real Active Sites in ZSM-5 Zeolites for Tetralin Conversion into Light Aromatics

Identifying the Location of Real Active Sites in ZSM-5 Zeolites for Tetralin Conversion into Light Aromatics

Catalytic transfer hydrogenation of levulinic acid to gamma-valerolactone over a zirconium-based FDCA hybrid: insights into the effect of heteropoly acids

ZSM-5 Zeolite-Encapsulated Pt-ZnO Bimetallic Catalysts for the Catalytic Cracking of Iso-Butane

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