Modified seeding method to produce hierarchical nanocrystalline ZSM-5 zeolite

Hamidzadeh, Marzieh; Saeidi, Mohsen; Komeili, Samane

doi:10.1016/j.mtcomm.2020.101308

Cited by 10 publications

(10 citation statements)

References 27 publications

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“…With the increase of XRD intensity, the crystal size decreased gradually. Similar results can also be found in references [ 7 , 19 ].…”

Section: Resultssupporting

confidence: 91%

“…With the increase of XRD intensity, the crystal size decreased gradually. Similar results can also be found in references [7,19]. The calcined samples with different seed contents were selected in order to perform a deeper investigation of their structural properties and porous parameters via the N 2 adsorption/desorption test at 77 K. Figure 3 presents their N 2 adsorption isotherms after calcination at 823 K for 6 h. These curves show a steep slope at the relative pressure of 10 −6 < P/P 0 < 0.01, which indicates the presence of micropores, and a hysteresis loop in the 0.40-1.0 relative pressure range relates to the mesoporosities.…”

Section: Effect Of the Amount Of Seed On The Sample Structuresupporting

confidence: 90%

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Optimized Preparation of Nanosized Hollow SSZ-13 Molecular Sieves with Ultrasonic Assistance

et al. 2020

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Because of its unique eight-membered ring pore structure and the arrangement of cations in its structure, the SSZ-13 molecular sieve has a higher affinity for CO2 than other gases, meaning it has attracted more attention than other porous materials for CO2 adsorption. However, the expensive template and long preparation time limits the industrial production of SSZ-13. In this work, a hollow structure was successfully introduced into the nanosized SSZ-13 molecular sieve with ultrasonic treatment. The effects of the amount of seed added and the ultrasonic time on the structure were investigated. When the amount of seed added was 0.5 wt.% and the ultrasonic time was 60 min, the sample showed a hollow cubic crystal with a diameter of about 50 nm. The specific surface area reached 791.50 m2/g, and the mesoporous ratio was 66.3%. The samples were tested for CO2 adsorption performance at 298 K. It was found that the hollow sample prepared in this work has higher CO2 adsorption capacity compared with the SSZ-13 zeolite prepared with conventional methods. When the adsorption pressure was 0.27 bar, the adsorption amount reached 2.53 mmol/g. The hollow SSZ-13 molecular sieve reached a CO2 adsorption capacity of 4.24 mmol/g at 1 bar.

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“…With the increase of XRD intensity, the crystal size decreased gradually. Similar results can also be found in references [ 7 , 19 ].…”

Section: Resultssupporting

confidence: 91%

Section: Effect Of the Amount Of Seed On The Sample Structuresupporting

confidence: 90%

Optimized Preparation of Nanosized Hollow SSZ-13 Molecular Sieves with Ultrasonic Assistance

et al. 2020

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“…Moreover, the peaks that appeared at 2 θ = 7.8, 8.0 and 8.9° for Z3, Z6 and Z9 samples are identified as (101), (001) and (200) planes of ZSM-5. 46 …”

Section: Resultsmentioning

confidence: 99%

Optimization of hierarchical ZSM-5 structure from kaolin as catalysts for biofuel production

et al. 2023

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“…These results suggested that TPA + participated in the crystallization process of recrystallization. [42][43][44] Based on the above findings, the detailed formation mechanism of hollow ZSM-5 with double shell was proposed (Figure 3f). TPA + adsorbed on the external surface of core@shell zeolites due to its larger molecular size, while OH − diffused into bulk phase.…”

Section: Cavity Fabrication For Core@shell Zeolite With Double Shellsmentioning

confidence: 93%

Hollow Zeolite Nanoreactor with Double Shells for Methanol Aromatization: Explicit Recognition on Catalytic Function of Inverse Elemental Zone and Shell‐Cavity

Ma,

Fu,

Wang

et al. 2024

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Core@shell catalyst composited of dual aluminosilicate zeolite can effectively regulate the distribution of acid sites to control hydrocarbon conversion process for the stable formation of target product. However, the diffusion restriction reduces the accessibility of inner active sites and affects synergy between core and shell. Herein, hollow ZSM‐5 zeolite nanoreactor with inverse aluminum distribution and double shells are prepared and employed for methanol aromatization. It is demonstrated that the intershell cavity alleviated the steric hindrance from zeolites channel and provided more paths and pore entrance for guest molecule. Correspondingly, olefin intermediates generated from methanol over the external shell are easier to adsorb at internal acid sites for further reactions. Importantly, the diffusion of generated aromatic macromolecules to the external surface is also promoted, which slows down the formation of internal coke, and ensures the use of internal acid sites for aromatization. The aromatics selectivity of the nanoreactor remained at 8% after 154 h, while that of solid core@shell catalyst decreased to 2% after 75 h. This finding promises broader insight to improve internal active site utilization of core@shell catalyst at the diffusion level and can be great aid in the flexible design of multifunctional nanoreactors to enhance the relay efficiency.

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Modified seeding method to produce hierarchical nanocrystalline ZSM-5 zeolite

Cited by 10 publications

References 27 publications

Optimized Preparation of Nanosized Hollow SSZ-13 Molecular Sieves with Ultrasonic Assistance

Optimized Preparation of Nanosized Hollow SSZ-13 Molecular Sieves with Ultrasonic Assistance

Optimization of hierarchical ZSM-5 structure from kaolin as catalysts for biofuel production

Hollow Zeolite Nanoreactor with Double Shells for Methanol Aromatization: Explicit Recognition on Catalytic Function of Inverse Elemental Zone and Shell‐Cavity

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