徳島大学 教育・研究者情報データベース(EDB)

1. 徳島大学.大学院社会産業理工学研究部.理工学域.応用化学系.化学プロセス工学分野(2017年4月1日〜)
2. 徳島大学.創成科学研究科.理工学専攻.応用化学システムコース(創成科学研究科).化学プロセス工学講座(創成科学研究科)(2020年4月1日〜)

1. 杉山 茂

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2. (英) Yoshida Tashu / (日) 吉田 多秀 / (読) よしだ たしゅう

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3. 霜田 直宏([徳島大学.大学院社会産業理工学研究部.理工学域.応用化学系.化学プロセス工学分野]/徳島大学.理工学部.理工学科.応用化学システムコース.化学プロセス工学講座/徳島大学.工学部.化学応用工学科.化学プロセス工学講座/徳島大学.先端技術科学教育部.物質生命システム工学専攻.化学機能創生コース.化学プロセス工学講座)

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4. 植木 智之([徳島大学.技術支援部.常三島技術部門.地域協働グループ]/[徳島大学.大学院社会産業理工学研究部.総合技術センター])

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5. (英) Kato Yuki / (日) 加藤 裕樹 / (読) かとう ゆうき

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6. (英) Ninomiya Wataru / (日) 二宮 航 / (読) にのみや わたる

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(英) Carbon Deposition Assisting the Enhancement of Catalytic Activity with Time-on-Stream in the Dehydrogenation of Isobutane over NiO/Al2O3

(英) In the transformation reaction of alkanes to alkenes via catalytic dehydrogenation, it is generally accepted that the so-called catalytic deactivation behavior will occur. This phenomenon causes a drastic reduction in activity with time-on-stream. It is understood that carbon deposition generated during the reaction then covers the surface of the catalyst, and this leads to a drastic decrease in activity. However, contrary to this common wisdom, our laboratory reported that the dehydrogenation of isobutane to isobutene on NiO/γ-Al2O3 within a specific range of NiO loading in the presence of CO2 actually improved the yield of isobutene with time-on-stream. Since few such cases have been reported, in this study, isobutane was dehydrogenated in the presence of CO2 using NiO/α-Al2O3 as the catalyst with 20% NiO loading and improvement was again observed. In order to investigate the cause of the improvement, both NiO/γ-Al2O3 and NiO/α-Al2O3 with 20% NiO loading were examined in detail following the reaction. According to TEM analysis, both catalysts were covered with a large amount of carbon deposition after the reaction, but there was a difference in the types. The carbon deposition on NiO/γ-Al2O3 had a fibrous nature while that on NiO/α-Al2O3 appeared to be a type of nanowire. Raman spectroscopy revealed that the carbonaceous crystal growth properties of two forms differed depending on the support. In particular, a catalytically active species of metallic nickel was formed in a high degree of dispersion in and on the above two forms of carbon deposition during the reaction, and this resulted in high activity even if the catalyst was covered with a carbon deposition.

1. (英) Dehydrogenation
2. (英) Isobutane
3. (英) Nickel Oxide
4. (英) Catalyst Deactivation
5. (英) Carbon Deposition