Journal Article Oxidative Dehydrogenation of Isobutane to Isobutene on Metal-doped MCM-41 Catalysts

Ehiro, Takuya  ,  Itagaki, Ai  ,  Misu, Hisanobu  ,  Kurashina, Masashi  ,  Nakagawa, Keizo  ,  Katoh, Masahiro  ,  Katou, Yuuki  ,  Ninomiya, Wataru  ,  Sugiyama, Shigeru

49 ( 2 )  , pp.136 - 143 , 2016
MCM-41 (#41 Mobil Composition of Matter) is a favorable material for heterogeneous reactions because of its unique porous structure. However, the catalytic activity of MCM-41 for the oxidative dehydrogenation (ODH) of isobutane to isobutene is known to be quite low. In the present study, a metal-doping method was employed to improve this catalytic activity. Doping of Cr, Co, Ni, or Mo into MCM-41 resulted in a great improvement in the catalytic activity. Since chromium-doped MCM-41 (Cr-MCM-41) showed the greatest catalytic activity among these catalysts, its redox property was further analyzed via XPS, XAFS and H2-TPR techniques. The XPS spectrum of Cr-MCM-41 suggested that it has Cr3+ and Cr6+ species on its surface. Also, a pre-edge peak due to Cr6+ species was confirmed in the XANES spectrum of Cr-MCM-41. In H2-TPR measurement, Cr-MCM-41 was more reducible than crystalline Cr2O3, which showed low catalytic activity for the ODH of isobutane. The reducible Cr6+ species on Cr-MCM-41 contributed to an improvement in the catalytic activity of MCM-41.

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