Introduction of a Small Amount of Chromium to Enhance the Catalytic Performance of SBA-15 for the Oxidative Dehydrogenation of Isobutane to Isobutene

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  • Kato Yuki
    Otake R&D Center, Mitsubishi Chemical Corporation
  • Misu Hisanobu
    Department of Chemical Science and Technology, Tokushima University
  • Shimazu Sho
    Department of Chemical Science and Technology, Tokushima University
  • Katoh Masahiro
    Department of Applied Chemistry, Graduate School of Technology, Industrial and Social Science, Tokushima University
  • Ninomiya Wataru
    Otake R&D Center, Mitsubishi Chemical Corporation
  • Sugiyama Shigeru
    Department of Applied Chemistry, Graduate School of Technology, Industrial and Social Science, Tokushima University Department of Resource Circulation Engineering, Center for Frontier Research of Engineering, Tokushima University

Bibliographic Information

Published
2018-05-20
Resource Type
journal article
DOI
  • 10.1252/jcej.17we311
Publisher
The Society of Chemical Engineers, Japan

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<p>Various solid oxide catalysts are active for the oxidative dehydrogenation of propane, but achieve yields of less than 2% when these were used for the oxidative dehydrogenation of isobutane to isobutene. An improved isobutene yield of 8% was obtained in the oxidative dehydrogenation of isobutane by using a folded-sheet mesoporous material (FSM-16) and mesoporous molecular sieve (MCM-41), with or without chromium via impregnation or template-ion exchange methods. Further activity enhancement, however, could not be attained. In the present study, chromium cations were introduced into the framework of SBA-15 using a direct synthesis method by mixing chromium nitrate with tetraethylorthosilicate in an aqueous solution with an initial pH of 1.5 and subsequent hydrothermal treatment. Loading the resultant catalyst, SBA-15, with a small amount of chromium (1.84 wt% Cr-SBA-15) increased the isobutene yield (15.4%) at 723 K, while a previous report showed that chromium oxide supported on SBA-15 (CrOx/SBA-15) prepared via incipient wetness impregnation had a lower isobutene yield (11%) at 813 K. To explain this improvement, the catalysts were characterized using X-ray diffraction, transmission electron microscopy, N2 adsorption–desorption, and NH3 temperature-programmed desorption. Cr-SBA-15 was found to have a large specific surface area (1,610 m2/g), although the structural and acidic nature of the catalyst was similar to the general properties of other mesoporous silicas. The conversion of Cr3+ species into Cr6+ on Cr-SBA-15 with the large specific surface area could affect the improvement of the oxidative dehydrogenation of isobutane to isobutene.</p>

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