ZSM-5MCM-41 core–shell composite with tunable shell thickness for n-heptane catalytic cracking reaction
Abstract Core–shell composite ZSM-5MCM-41 was synthesized by a two-step process, in which both self-assembly crystallization and Stöber method were applied. The tunable mesoporous shells with thickness of 25 to 145 nm were obtained by adjusting the mass ratio of TEOS/ZSM-5 from 1.0 to 2.0. Higher mesopore volume was observed with thicker shells, in which microporous structures were well-maintained. To explore the effect of shell thickness on the reaction, the n-heptane catalytic cracking was chosen as the model reaction. The catalytic performance of ZSM-5@MCM-41 was obviously enhanced by introducing MCM-41 shell, comparing with ZSM-5 zeolite alone. The passivation of external surface acid sites of core ZSM-5 largely inhibited the undesirable bimolecular reaction of light olefins. Meanwhile the increased MCM-41 shell thickness provided much less diffusion resistance. The above effects jointly improved n-heptane conversion and light olefin selectivity. It is confirmed in this work that suitable acid sites distribution and enhanced diffusion by applying hierarchical structure is an effective strategy to improve the catalytic activity of ZSM-5 in n-heptane cracking..
| Medienart: |
Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:135 |
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| Enthalten in: |
Reaction kinetics, mechanisms and catalysis - 135(2022), 4 vom: 24. Juni, Seite 2031-2043 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zhang, Xiaoxiao [VerfasserIn] |
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| Links: |
Volltext [lizenzpflichtig] |
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| Themen: |
-heptane |
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| Anmerkungen: |
© Akadémiai Kiadó, Budapest, Hungary 2022 |
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| doi: |
10.1007/s11144-022-02228-4 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
OLC2079168452 |
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| 520 | |a Abstract Core–shell composite ZSM-5MCM-41 was synthesized by a two-step process, in which both self-assembly crystallization and Stöber method were applied. The tunable mesoporous shells with thickness of 25 to 145 nm were obtained by adjusting the mass ratio of TEOS/ZSM-5 from 1.0 to 2.0. Higher mesopore volume was observed with thicker shells, in which microporous structures were well-maintained. To explore the effect of shell thickness on the reaction, the n-heptane catalytic cracking was chosen as the model reaction. The catalytic performance of ZSM-5@MCM-41 was obviously enhanced by introducing MCM-41 shell, comparing with ZSM-5 zeolite alone. The passivation of external surface acid sites of core ZSM-5 largely inhibited the undesirable bimolecular reaction of light olefins. Meanwhile the increased MCM-41 shell thickness provided much less diffusion resistance. The above effects jointly improved n-heptane conversion and light olefin selectivity. It is confirmed in this work that suitable acid sites distribution and enhanced diffusion by applying hierarchical structure is an effective strategy to improve the catalytic activity of ZSM-5 in n-heptane cracking. | ||
| 650 | 4 | |a Catalytic cracking | |
| 650 | 4 | |a -heptane | |
| 650 | 4 | |a Core–shell zeolite | |
| 650 | 4 | |a Diffusion | |
| 650 | 4 | |a Light olefins | |
| 700 | 1 | |a Chen, Fengqiu |4 aut | |
| 700 | 1 | |a Yu, Faquan |4 aut | |
| 700 | 1 | |a Cheng, Dang-guo |4 aut | |
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