Discovering the Active Sites for C3 Separation in MIL‐100(Fe) by Using Operando IR Spectroscopy |
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| Authors: | Dr Stefan Wuttke Dr Philippe Bazin Dr Alexandre Vimont Dr Christian Serre Dr You‐Kyong Seo Dr Young Kyu Hwang Dr Jong‐San Chang Prof Gérard Férey Prof Marco Daturi |
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| Institution: | 1. Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6, Boulevard Maréchal Juin, 14050 Caen (France), Fax: (+33) 31452822;2. Institut Lavoisier (UMR CNRS 8180), Université de Versailles Saint‐Quentin‐en‐Yvelines, 45, Avenue des Etats‐Unis, 78035 Versailles (France);3. Biorefinery Research Group, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang‐dong 100, Yuseong, Daejeon 305‐600 (South Korea) |
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| Abstract: | A reducible MIL‐100(Fe) metal–organic framework (MOF) was investigated for the separation of a propane/propene mixture. An operando methodology was applied (for the first time in the case of a MOF) in order to shed light on the separation mechanism. Breakthrough curves were obtained as in traditional separation column experiments, but monitoring the material surface online, thus providing evidences on the adsorption sites. The qualitative and quantitative analyses of FeII and, to some extent, FeIII sites were possible, upon different activation protocols. Moreover, it was possible to identify the nature and the role of the active sites in the separation process by selective poisoning of one family of sites: it was clearly evidenced that the unsaturated FeII sites are mainly responsible for the separation effect of the propane/propene mixture, thanks to their affinity for the unsaturated bonds, such as the C?C entities in propene. The activity of the highly concentrated FeIII sites was also highlighted. |
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| Keywords: | active sites hydrocarbon separation IR spectroscopy metal– organic frameworks IR spectroscopy reaction mechanisms |
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