Regeneration of Alumina-supported Nickel Oxide Catalyst Covered with Large Amounts of Carbon Deposits during the Dehydrogenations of Ethane, Propane, and Isobutane

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  • SUGIYAMA Shigeru
    Dept. of Applied Chemistry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • KOIZUMI Akihiko
    Dept. of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Tokushima University
  • IWAKI Takahisa
    Dept. of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Tokushima University
  • IWAI Taiki
    Dept. of Applied Chemistry, Faculty of Science and Technology, Tokushima University
  • SHIMODA Naohiro
    Dept. of Applied Chemistry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • KATO Yuki
    MMA R&D Center, Mitsubishi Chemical Corp.
  • NINOMIYA Wataru
    MMA R&D Center, Mitsubishi Chemical Corp.

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  • エタン，プロパンおよびイソブタンの脱水素により析出した大量の炭素に覆われたアルミナ担持酸化ニッケルの触媒再生

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Abstract

<p>Improvement in the dehydrogenations of ethane, propane, and isobutane over alumina-supported nickel oxides occurs together with the formation of large amounts of carbon deposits with time-on-stream, but catalyst activity is decreased with an additional increase in time-on-stream. This improvement in activity is due to metallic nickel formation that is highly dispersed over carbon nanotube-like deposits. However, the activity decreases as this highly dispersed metallic nickel is further covered with carbon deposits. We describe the use of oxygen treatment to regenerate the catalyst. Oxygen treatment to remove carbon deposits generally results in a less active catalyst due to sintering of the active species. However, we speculated that sintered nickel oxide could form carbon nanotubes in the proposed system, and that the formation of highly dispersed nickel over the nanotubes would regenerate the catalyst. To prove this hypothesis, dehydrogenations of ethane, propane, and isobutane were investigated using 18, 15, and 20 % nickel oxide supported on γ-alumina, respectively. We confirmed regeneration of the catalytic activity via oxygen treatment during subsequent dehydrogenations.</p>

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