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Discovering the Active Sites for C3 Separation in MIL‐100(Fe) by Using Operando IR Spectroscopy
Author(s) -
Wuttke Stefan,
Bazin Philippe,
Vimont Alexandre,
Serre Christian,
Seo YouKyong,
Hwang Young Kyu,
Chang JongSan,
Férey Gérard,
Daturi Marco
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201006
Subject(s) - propene , propane , adsorption , chemistry , separation process , chromatographic separation , chemical engineering , metal , catalysis , materials science , chromatography , organic chemistry , high performance liquid chromatography , engineering
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 Fe II and, to some extent, Fe III 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 Fe II sites are mainly responsible for the separation effect of the propane/propene mixture, thanks to their affinity for the unsaturated bonds, such as the CC entities in propene. The activity of the highly concentrated Fe III sites was also highlighted.