Acidic Properties of Various Silica Catalysts Doped with Chromium for the Oxidative Dehydrogenation of Isobutane to Isobutene

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  • Sugiyama Shigeru
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima Department of Resource Circulation Engineering, Center for Frontier Research of Engineering, The University of Tokushima
  • Ehiro Takuya
    Department of Chemical Science and Technology, The University of Tokushima
  • Nitta Yoshihisa
    Department of Chemical Science and Technology, The University of Tokushima
  • Itagaki Ai
    Department of Chemical Science and Technology, The University of Tokushima
  • Nakagawa Keizo
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima Department of Resource Circulation Engineering, Center for Frontier Research of Engineering, The University of Tokushima
  • Katoh Masahiro
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima
  • Katou Yuuki
    Otake Research Laboratories, Mitsubishi Rayon Co., Ltd.
  • Akihara Shuji
    Otake Research Laboratories, Mitsubishi Rayon Co., Ltd.
  • Yasukawa Toshiya
    Otake Research Laboratories, Mitsubishi Rayon Co., Ltd.
  • Ninomiya Wataru
    Otake Research Laboratories, Mitsubishi Rayon Co., Ltd.

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Although previous researchers have found that FSM-16 (#16 Folded Sheet Mesoporous material) doped with chromium and related Cr-doped silica catalysts has shown great activity for the oxidative dehydrogenation of isobutane to isobutene, information on the nature of these catalysts is insufficient. For this study, three types of Cr-doped silica catalysts were prepared by applying the template ion exchange method. CrOx/FSM-16 and CrOx/SiO2 were used as references. These catalysts were used for oxidative dehydrogenation, which was then characterized via various techniques. The most active catalyst was Cr-doped silica, which did not have the hexagonal structure that is characteristic of mesoporous FSM-16. Various characterizations showed that the catalytic activity of the Cr-species, stemmed from a weak acidic nature and a redox nature that originated from the combination of silicate and a Cr cation, as opposed to the hexagonal structure and strong acidic nature of FSM-16.

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