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Facile Synthesis of Nanosheet-Stacked Hierarchical ZSM-5 Zeolite for Efficient Catalytic Cracking of n-Octane to Produce Light Olefins
| Content Provider | MDPI |
|---|---|
| Author | Wang, Peng Xiao, Xia Pan, Yutong Zhao, Zhen Jiang, Gui Yuan Zhang, Zhongdong Meng, Fan Fang Li, Yuming Fan, Xiaoqiang Kong, Lian Xie, Zean |
| Copyright Year | 2022 |
| Description | The development of an effective strategy for synthesizing two-dimensional MFI zeolites has attracted more and more attention. Herein, nanosheet-stacked hierarchical ZSM-5 zeolite was obtained by a seed-assisted hydrothermal synthesis route using a small amount of [C_{18}H_{37}-N^{+}(CH_{3})_{2}-C_{6}H_{12}-N^{+}$(CH_{3})_{2}-C_{6}H_{12}]Br_{2}$ $(C_{18-6-6}Br_{2}$) as a zeolite structure-directing agent and triethylamine (TEA) as a zeolite growth modifier. By varying the molar ratio of $C_{18-6-6}Br_{2}$/TEA from 2.5/0 to 2.5/40, the morphologies and textural properties of the resultant HZ5-2.5/x catalysts were finely modulated. By increasing x from 5 to 40, the morphology of the HZ5-2.5/x changed from unilamellar assembly with narrow a–c plane to intertwined nanosheets with wide a–c plane and multilamellar nanosheets with house-of-cards morphology. The thickness of these nanosheets was almost 8–10 nm. In addition, selectivity to light olefins reached 70.7% for the HZ5-2.5/10 catalyst, which was 6.6% higher than that for CZSM-5 (64.1%). Furthermore, the MFI zeolite nanosheets exhibited better anticoking stability within the 60 h reaction time compared to conventional ZSM-5 zeolite, which could be attributed to the short diffusion path and hierarchical porosity. This work will provide valuable insights into the rational design of novel zeolite catalysts for the efficient cracking of hydrocarbons. |
| Starting Page | 351 |
| e-ISSN | 20734344 |
| DOI | 10.3390/catal12030351 |
| Journal | Catalysts |
| Issue Number | 3 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-03-21 |
| Access Restriction | Open |
| Subject Keyword | Catalysts Zsm-5 Nanosheets Zeolite Growth Modifiers Catalytic Cracking of N-octane Light Olefins |
| Content Type | Text |
| Resource Type | Article |
