Effect of iron oxide on isobutane dehydrogenation over Pt/Fe₂O₃-Al₂O₃ catalyst

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• 作者：Shingo Kobayashi ; Shinji Kaneko ; Masa-aki Ohshima ; Hideki Kurokawa ; Hiroshi Miura ; ^{hmiura@mail.saitama-u.ac.jp}
• 关键词：Iron oxide addition ; Isobutane dehydrogenation ; Pt-Sn catalyst ; CO adsorption ; Catalyst deactivation
• 刊名：Applied Catalysis A: General
• 出版年：2012
• 出版时间：29 February, 2012
• 年：2012
• 卷：417-418
• 期：Complete
• 页码：306-312
• 全文大小：647 K

文摘

The effect of adding Fe₂O₃ to an Al₂O₃-supported Pt catalyst on isobutane dehydrogenation was studied. Catalytic activity, catalyst stability, and selectivity to isobutene were improved significantly by adding a small amount of Fe₂O₃ to Pt/Al₂O₃. The catalysts were characterized by CO and NH₃ chemisorption measurements, Fourier transformed-infrared (FT-IR) analysis of adsorbed CO, and thermogravimatric-differential thermal analysis (TG-DTA) of the used catalyst. FT-IR analysis of the adsorbed CO showed that the electron density of Pt was increased by the formation of bimetallic particles. CO chemisorption suggested the formation of Pt-Fe bimetallic particles partially covered with Fe species. Furthermore, the number of strong acid sites on the Al₂O₃ surface was decreased by adding Fe₂O₃. Analysis of the used catalysts suggested that the addition of Fe₂O₃ inhibited sintering of supported Pt particles. The addition of Sn to Pt/Fe₂O₃-Al₂O₃ further improved the dehydrogenation activity of the catalyst. This catalyst showed better catalytic activity than that of Pt-Sn/Zn-Al-O, which has been employed in a commercial process and has been reported as an excellent catalyst in dehydrogenation reactions. We claim that we have developed a novel dehydrogenation catalyst system, Pt-Sn/Fe₂O₃-Al₂O₃, which has better catalytic properties than the reported commercial catalyst.