Synthesis and characterization of GaZSM-5 with different Si/Ga molar ratio and its catalytic performance in the MTH reaction

GAO Jun-hua; LIU Ping; JI Ke-ming; HAN Li-hua; LIU Zeng-hou; ZHOU Hao; ZHANG Kan

Volume 46 Issue 4

Apr. 2018

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Article Navigation > Journal of Fuel Chemistry and Technology > 2018 > 46(4): 465-472

GAO Jun-hua, LIU Ping, JI Ke-ming, HAN Li-hua, LIU Zeng-hou, ZHOU Hao, ZHANG Kan. Synthesis and characterization of GaZSM-5 with different Si/Ga molar ratio and its catalytic performance in the MTH reaction[J]. Journal of Fuel Chemistry and Technology, 2018, 46(4): 465-472.

Citation:

GAO Jun-hua, LIU Ping, JI Ke-ming, HAN Li-hua, LIU Zeng-hou, ZHOU Hao, ZHANG Kan. Synthesis and characterization of GaZSM-5 with different Si/Ga molar ratio and its catalytic performance in the MTH reaction[J]. Journal of Fuel Chemistry and Technology, 2018, 46(4): 465-472.

Citation:

GAO Jun-hua, LIU Ping, JI Ke-ming, HAN Li-hua, LIU Zeng-hou, ZHOU Hao, ZHANG Kan. Synthesis and characterization of GaZSM-5 with different Si/Ga molar ratio and its catalytic performance in the MTH reaction[J]. Journal of Fuel Chemistry and Technology, 2018, 46(4): 465-472.

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Synthesis and characterization of GaZSM-5 with different Si/Ga molar ratio and its catalytic performance in the MTH reaction

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

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The project was supported by the Chinese Academy of Sciences Strategic Priority Research Program XDA-07070400

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Corresponding author: ZHANG Kan, Tel: 0351-4040012, Fax: 0351-4040003，E-mail: zhangkan@sxicc.ac.cn
Received Date: 2017-11-27
Rev Recd Date: 2018-02-07

Available Online: 2021-01-23

Publish Date: 2018-04-10

Abstract

Abstract

GaZSM-5 molecular sieve catalysts with different Si/Ga molar ratios were prepared with hydrothermal synthesis method followed by acid exchange and pelletization. The catalyst samples were characterized using XRD, SEM, FT-IR, XPS, ICP, low temperature N₂ physical adsorption and desorption, NH₃-TPD and Py-FTIR. The catalytic performance in the reaction of methanol to hydrocarbons was evaluated in a fixed bed reactor system. The results indicated that there were two kinds of gallium species, i. e. Ga in the framework Ga and Ga₂O₃ species on the crystal surface. The catalysts synthesized from SiO₂/Ga₂O₃ (60/1) gel with modest acidity (0.62 mmol NH₃/g and the ratio of B/L 4.88) and large mesopore volume of 0.51 cm³/g had the best catalytic stability. Under the same reaction conditions, the lifetime of GaZSM-5 catalyst was 456 h. The acid strength of GaZSM-5 was weaker than that of AlZSM-5, which could inhibit the coke formation. The intercrystalline mesopores of the nano GaZSM-5 crystal improved the diffusion property as well the catalyst stability. The GaZSM-5 lifetime was prolonged by 120 h.
- Si/Ga molar ratio,
- ZSM-5,
- acid catalysis,
- methanol,
- hydrocarbon

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References(31)

References

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