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Isobutane/1-butene Alkylation Performance of Ammonium Fluoride-Modified HUSY Zeolite

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Abstract

A series of modified HUSY zeolites were prepared by immersing with different concentration of NH4F solution at low temperature, and their catalytic performance for isobutane/1-butene alkylation reaction was investigated. The physicochemical properties of modified catalysts were characterized by XRD, N2 adsorption–desorption isotherms, ICP, pyridine-IR and SEM. The results indicated that HUSY zeolite with higher Si/Al ratio is more sensitive to NH4F leaching, resulting in more severe structural amorphization. NH4F modification affects not only the pore structure but also the acid properties. The amount of Lewis acid sites on the modified zeolites was reduced and the ratio of Brønsted/Lewis acid sites was significantly enhanced in comparison with that of parent zeolite. Such properties of modified zeolites account for the superior performance for isobutane/1-butene alkylation. The initial C8 selectivity was increased to 74 wt% over the modified HUSY (Si/Al = 2.7) zeolite using 5 wt% NH4F solution, which was about 15 wt% higher than that achieved on the HUSY parent. TG and in situ IR analyses of the deactivated catalyst indicated that some deposits were formed on the catalyst and the alkylation activity could be restored by regeneration at suitable conditions (520 °C under air atmosphere).

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Acknowledgement

We gratefully acknowledge the Fundamental Research Funds for the Central Universities (WA1817027).

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Authors and Affiliations

  1. International Joint Research Center of Clean Energy and Chemical Engineering, Institute of Chemical Engineering, East China University of Science & Technology, Shanghai, 200237, People’s Republic of China

    Jing Liu, Ning Ding, Sinong Zhou & Xiaolong Zhou

  2. SINOPEC Shanghai Research Institute of Petrochemical Technology, Shanghai, 201208, People’s Republic of China

    Xuesi Hong

  3. ESIQIE, Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional S/N, Col. Zacatenco, 07738, Mexico City, Mexico

    Jin An Wang & Lifang Chen

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  1. Jing Liu
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  2. Ning Ding
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  3. Xuesi Hong
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  4. Sinong Zhou
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  5. Xiaolong Zhou
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  6. Jin An Wang
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Correspondence to Xiaolong Zhou.

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Liu, J., Ding, N., Hong, X. et al. Isobutane/1-butene Alkylation Performance of Ammonium Fluoride-Modified HUSY Zeolite. Catal Lett 150, 2996–3006 (2020). https://doi.org/10.1007/s10562-020-03187-y

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  • DOI: https://doi.org/10.1007/s10562-020-03187-y

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