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Fang T, Xie Y, Li L, He Y, Yang X, Zhang L, Jia W, Huang H, Li J, Zhu Z. High-efficiency hydrocracking of phenanthrene into BTX aromatics over a Ni-modified lamellar-crystal HY zeolite. Phys Chem Chem Phys 2022; 24:8624-8630. [PMID: 35355031 DOI: 10.1039/d1cp05954h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A new Ni-HY zeolite with lamellar-crystals was prepared as a catalyst for phenanthrene hydrocracking. It showed significantly improved reactivity and BTX (benzene, toluene and xylene) selectivity (up to 99.1% and 75.6%, respectively), depending on a reasonable synergistic effect between its excellent internal-diffusion and the high-efficiency concerted catalysis of surface metal-Ni active sites and acid sites. In particular, compared with a conventional Ni-HY with diamond-shaped crystals, its significantly shortened diffusion-reaction path of the micropore system in the lamellar crystals greatly enhanced the diffusion-reaction efficiency of large-molecule phenanthrene and polycyclic intermediates and remarkably improved the utilization of both pores and internal reactive sites, powerfully promoting phenanthrene into benzene series conversion. The much decreased diffusion-residence time of benzene-series products in shortened channels also effectively weakened the further cracking loss of the benzene-ring, leading to enhanced BTX selectivity. Moreover, this shorter-channel Ni-HY catalyst with a higher external surface area and mesoporous volume also exhibited greatly improved catalytic stability attributed to its stronger capabilities of accommodating coke and resisting coke-deposition. The phenanthrene conversion of >76.3% and the BTX yield of >46.3% were obtained during a 60 h on-stream reaction.
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Affiliation(s)
- Ting Fang
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
| | - Yangli Xie
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
| | - Lirong Li
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
| | - Yao He
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
| | - Xu Yang
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
| | - Linjie Zhang
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
| | - Wenzhi Jia
- Department of Materials Engineering, Huzhou University, Huzhou 313000, China
| | - Hengbo Huang
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Siping Road 1239, Shanghai 200092, China
| | - Junhui Li
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
| | - Zhirong Zhu
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Siping Road 1239, Shanghai 200092, China
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