Citation: LIU Ru-ling, ZHU Hua-qing, WU Zhi-wei, QIN Zhang-feng, FAN Wei-bin, WANG Jian-guo. Aromatization of propane over Ga-modified ZSM-5 catalysts[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(8): 961-969. shu

Aromatization of propane over Ga-modified ZSM-5 catalysts

1.
1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

Corresponding author: ZHU Hua-qing, WANG Jian-guo,
Received Date: 31 March 2015
Available Online: 12 May 2015
Fund Project: 国家自然科学基金(21273264) (21273264)国家重点基础研究发展规划(973计划,2011CB201403,2011CB201406)。 (973计划,2011CB201403,2011CB201406)

H-ZSM-5 was modified with gallium by the ion-exchange method and characterized with XRD, SEM, BET, NH₃-TPD, Py-IR, ICP, and XPS techniques. The influences of the Si/Al mol ratios and the pretreatment conditions of the Ga-modified ZSM-5 ((Ga-H)-ZSM-5) on their acidity, gallium species state, and aromatization performance of propane were investigated. It was found that the Si/Al mol ratio had significant effects on the catalyst acidity and the interaction of non-framework Ga species with zeolite, and hence, the catalytic activity and selectivity for propane aromatization. At 550℃ and WHSV of 1.0h^-1, (Ga,H)-ZSM-5 with a Si/Al mol ratio of 30 showed the highest catalytic activity. It was shown that Ga species improved the aromatics selectivity and inhibited cracking reactions. After being reduced in hydrogen, Ga₂O₃ was most likely transformed into Ga⁺ and GaH⁺₂ species, and migrated into the zeolite channels. Subsequent air-oxidation treatment of the reduced (Ga,H)-ZSM-5 led to formation of GaO⁺ species, thus greatly increasing the aromatization activity.
- propane aromatization,
- Si/Al mol ratio,
- gallium species,
- ZSM-5 molecular sieves,
- pretreatment
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