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Effects of channel structure and acidity of molecular sieves in hydroisomerization of n-octane over bi-functional catalysts

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Abstract.

SAPO-5, −11, −31, −41, −34, ZSM-5, −22 and −23 were synthesized by using the hydrothermal method and characterized by various methods such as XRD, SEM, XRF and TPD of NH3. They are representative of large-pore, medium-pore, small-pore, weak acid, strong acid, monodimensional channel and zigzag channel type of molecular sieves. Effects of pore size, the number of acid sites over medium-pore SAPOs, acid strength and shape of medium-pore channel on hydroisomerization of n-octane were examined over Pt-loaded corresponding molecular sieves. These results indicate that the selectivity to isomerization in hydroisomerization of n-octane is highly influenced by channel structure in molecular sieves and the conversion activity of n-octane is dependent on acidity of molecular sieves. Monodimensional medium-pore molecular sieves are ideal catalytic materials for higher isomerization selectivity in hydroisomerization of n-octane regardless of acid strength, such as SAPO-11, −31, −41, ZSM-22 and −23.

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Authors and Affiliations

  1. Department of Catalysis Chemistry and Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116012, P R China

    Hu Yunfeng, Wang Xiangsheng & Guo Xinwen

  2. PetroChina Daqing Refining & Chemical Company, Daqing, 163411, P R China

    Hu Yunfeng, Li Silue, Sun Haibo & Bai Liang

  3. Research Institute of PetroChina Daqing Petrochemical Company, Daqing, 163714, P R China

    Hu Sheng

Authors
  1. Hu Yunfeng
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  2. Wang Xiangsheng
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  3. Guo Xinwen
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  4. Li Silue
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  5. Hu Sheng
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  6. Sun Haibo
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Correspondence to Guo Xinwen.

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Yunfeng, H., Xiangsheng, W., Xinwen, G. et al. Effects of channel structure and acidity of molecular sieves in hydroisomerization of n-octane over bi-functional catalysts. Catal Lett 100, 59–65 (2005). https://doi.org/10.1007/s10562-004-3086-9

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  • DOI: https://doi.org/10.1007/s10562-004-3086-9

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