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Preparation of γ-Al2O3 via Hydrothermal Synthesis Using ρ-Al2O3 as Raw Material for Propane Dehydrogenation

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Abstract

γ-Al2O3 was prepared by hydrothermal synthesis using ρ-Al2O3 and urea as raw materials. In this work, the effects of the molar ratio of CO(NH2)2/Al and reaction temperature were investigated, and a Pt–Sn–K/γ-Al2O3 catalyst was prepared. The ammonium aluminum carbonate hydroxide (AACH), γ-Al2O3, and Pt–Sn–K/γ-Al2O3 were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N2 adsorption–desorption, thermogravimetry–differential thermal analysis, and NH3 temperature-programmed desorption techniques. The reactivity of Pt–Sn–K/γ-Al2O3 for propane dehydrogenation was tested in a micro-fixed-bed reactor. The results show that γ-Al2O3 with a specific surface area of 358.1 m2/g and pore volume of 0.96 cm3/g was obtained when the molar ratio of CO(NH2)2/Al was 3:1 and the reaction temperature was 140 °C. The alumina obtained by calcination of AACH has a higher specific surface area and larger pore volume than the industrial pseudo-boehmite does. The catalyst prepared from AACH as precursor showed high selectivity and conversion, which can reach 96.1% and 37.6%, respectively, for propane dehydrogenation.

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Acknowledgements

The work was supported by Hebei University of Technology and CNOOC Tianjin Chemical Research and Design Institute Co., Ltd.

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300132, China

    Hongguang Liu & Xiaomin Dong

  2. CNOOC Tianjin Chemical Research and Design Institute Co., Ltd, Tianjin, 300131, China

    Hongguang Liu, Jiping Xia, Xiaoyun Li, Yanmin Sun & Qi Cai

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  1. Hongguang Liu
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  2. Xiaomin Dong
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  3. Jiping Xia
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  4. Xiaoyun Li
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  5. Yanmin Sun
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Correspondence to Xiaomin Dong or Xiaoyun Li.

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Liu, H., Dong, X., Xia, J. et al. Preparation of γ-Al2O3 via Hydrothermal Synthesis Using ρ-Al2O3 as Raw Material for Propane Dehydrogenation. Trans. Tianjin Univ. 26, 362–372 (2020). https://doi.org/10.1007/s12209-019-00225-8

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  • DOI: https://doi.org/10.1007/s12209-019-00225-8

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