Isobutane Dehydrogenation over Unimodal Porous Catalyst. Part 2. Role of Catalyst Components on Sn-Pt/ZnO/Al2O3.

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  • OKADA Yoshimi
    R & D Center, Chiyoda Corp.
  • IMAGAWA Kenichi
    R & D Center, Chiyoda Corp.
  • ASAOKA Sachio
    R & D Center, Chiyoda Corp. Dept. of Chemical Processes and Environments, Faculty of Environmental Engineering, The University of Kitakyushu

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Other Title
  • 細孔分布が均一な多孔質触媒によるイソブタンの脱水素反応　第２報　　Ｓｎ‐Ｐｔ／ＺｎＯ／Ａｌ２Ｏ３系触媒の成分の役割
  • サイコウ ブンプ ガ キンイツ ナ タコウシツ ショクバイ ニ ヨル イソブタン ノ ダツスイソ ハンノウ ダイ2ホウ Sn Pt ZnO Al2O3ケイ ショクバイ ノ セイブン ノ ヤクワリ
  • Role of Catalyst Components on Sn-Pt/ZnO/Al<sub>2</sub>O<sub>3</sub>
  • Sn-Pt/ZnO/Al<sub>2</sub>O<sub>3</sub>系触媒の成分の役割

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Abstract

The role of catalyst components with a large ZnO/Al2O3 surface area on Sn-Pt/ZnO/Al2O3 for dehydrogenation of isobutane was investigated by using the same γ-alumina carrier having unimodal pore distribution. It was found that the activity of ZnO/Al2O3 was 40 times greater than that of Pt/Al2O3, moreover ZnO/Al2O3 had also shown high cracking activity simultaneously. Pt played a role to promote the activity of ZnO/Al2O3 and suppress the catalyst deactivation. Possibly the effect of Pt addition was caused by reverse spillover. Sn suppressed the catalyst deactivation remarkably, since it improved both the activity and selectivity. The influence of the quantity of components in Sn-Pt/ZnO/Al2O3 catalyst on such performances as activity, selectivity, deactivation rate was also investigated. It seemed that excess addition of Sn caused the poisoning of certain active sites on ZnO/Al2O3 selectively. The side reaction scheme was investigated and it was considered that cracking and skeletal isomerization of isobutane occurred simultaneously in which cracking was predominant. When the quantity of the catalyst components was changed, inverse first order relation resulted between selectivity and deactivation rate constant. Possibly Sn had formed the Pt surface on the ZnO/Al2O3 bimetallic, and covered the cracking sites on ZnO/Al2O3.

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