Synthesis and characterization of BZSM-5 and its catalytic performance in the methanol to hydrocarbons reaction

doi:10.1016/j.cjche.2020.09.008

中国化学工程学报 ›› 2021, Vol. 35 ›› Issue (7): 196-203.DOI: 10.1016/j.cjche.2020.09.008

• Catalysis, Kinetics and Reaction Engineering • 上一篇下一篇

Synthesis and characterization of BZSM-5 and its catalytic performance in the methanol to hydrocarbons reaction

Junhua Gao, Keming Ji, Hao Zhou, Jiayao Xun, Zenghou Liu, Kan Zhang, Ping Liu

State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

收稿日期:2020-02-05 修回日期:2020-09-04 出版日期:2021-07-28 发布日期:2021-09-30
通讯作者: Keming Ji
基金资助:
This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) (XDA21020500).

Synthesis and characterization of BZSM-5 and its catalytic performance in the methanol to hydrocarbons reaction

Junhua Gao, Keming Ji, Hao Zhou, Jiayao Xun, Zenghou Liu, Kan Zhang, Ping Liu

State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Received:2020-02-05 Revised:2020-09-04 Online:2021-07-28 Published:2021-09-30
Contact: Keming Ji
Supported by:
This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) (XDA21020500).

摘要/Abstract

摘要： Five kinds of BZSM-5 molecular sieve with different Si/B ratio and a SiZSM-5 molecular sieve were prepared by hydrothermal synthesis method followed by acid exchange and pelletization. The samples were characterized by XRD, SEM, FT-IR, ICP, low temperature N₂ physical adsorption and desorption, NH₃-TPD and Py-IR. The catalytic performance in the reaction of methanol to hydrocarbons was evaluated in the fixed bed reactor. Compared with SiZSM-5, the amount and strength of Brönsted (B) acid were enhanced by introducing skeleton boron and the activity of the catalyst was greatly improved. The characterization and evaluation results indicated that the BZSM-5 catalyst synthesized from the gel of SiO₂/B₂O₃ 20 with Si/B ratio 74.48 had modest acidity strength, acid amount of 0.18mmol NH₃·g^-1 and large mesopore volume of 0.23cm³·g^-1. The B acid ratio was higher and the acid strength of BZSM-5 was weaker than that of AlZSM-5, which could inhibit the deep coke formation and increase the activity stability. B-2 had the best lifetime which could reach 672h under the same evaluation reaction conditions, due to the best matching of moderate acidity and good diffusion properties.

关键词: ZSM-5, Catalysis, Methanol, Hydrocarbons

Abstract: Five kinds of BZSM-5 molecular sieve with different Si/B ratio and a SiZSM-5 molecular sieve were prepared by hydrothermal synthesis method followed by acid exchange and pelletization. The samples were characterized by XRD, SEM, FT-IR, ICP, low temperature N₂ physical adsorption and desorption, NH₃-TPD and Py-IR. The catalytic performance in the reaction of methanol to hydrocarbons was evaluated in the fixed bed reactor. Compared with SiZSM-5, the amount and strength of Brönsted (B) acid were enhanced by introducing skeleton boron and the activity of the catalyst was greatly improved. The characterization and evaluation results indicated that the BZSM-5 catalyst synthesized from the gel of SiO₂/B₂O₃ 20 with Si/B ratio 74.48 had modest acidity strength, acid amount of 0.18mmol NH₃·g^-1 and large mesopore volume of 0.23cm³·g^-1. The B acid ratio was higher and the acid strength of BZSM-5 was weaker than that of AlZSM-5, which could inhibit the deep coke formation and increase the activity stability. B-2 had the best lifetime which could reach 672h under the same evaluation reaction conditions, due to the best matching of moderate acidity and good diffusion properties.

Key words: ZSM-5, Catalysis, Methanol, Hydrocarbons

Junhua Gao, Keming Ji, Hao Zhou, Jiayao Xun, Zenghou Liu, Kan Zhang, Ping Liu. Synthesis and characterization of BZSM-5 and its catalytic performance in the methanol to hydrocarbons reaction[J]. 中国化学工程学报, 2021, 35(7): 196-203.

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Synthesis and characterization of BZSM-5 and its catalytic performance in the methanol to hydrocarbons reaction

Synthesis and characterization of BZSM-5 and its catalytic performance in the methanol to hydrocarbons reaction

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