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Structural flexibility of a copper-based metal–organic framework: sorption of C4-hydrocarbons and in situ XRD

  • Pure component sorption isotherms of n-butane, isobutane, 1-butene and isobutene on the metal–organic framework (MOF) 3∞[Cu4(μ4-O)(μ2-OH)2(Me2trz-pba)4] at various temperatures between 283 K and 343 K and pressures up to 300 kPa are presented. The isotherms show a stepwise pore filling which is typical for structurally flexible materials with broad adsorption–desorption hysteresis loops. GatePure component sorption isotherms of n-butane, isobutane, 1-butene and isobutene on the metal–organic framework (MOF) 3∞[Cu4(μ4-O)(μ2-OH)2(Me2trz-pba)4] at various temperatures between 283 K and 343 K and pressures up to 300 kPa are presented. The isotherms show a stepwise pore filling which is typical for structurally flexible materials with broad adsorption–desorption hysteresis loops. Gate opening pressures in their endemic characteristic depend on the used hydrocarbon gases. From all investigated gases only the isotherms of 1-butene present a second step at a relative pressure above p/p0 = 0.55. As a consequence, only 1-butene can fully open the framework resulting in a pore volume of 0.54 cm3 g−1. This result is in good agreement with the value of 0.59 cm3 g−1 calculated based on single crystal structure data. The isosteric heat of adsorption was calculated from the experimental isotherms for all C4-isomers. At low loadings the isosteric heat is in a narrow region between 41 and 49 kJ mol−1. Moreover, in situ XRD measurements at different relative hydrocarbon pressures were performed at 298 K for the C4-isomers. The differences in the pressure-depending powder diffraction patterns indicate phase transitions as a result of adsorption. Similar diffraction patterns were observed for all C4-hydrocarbons, except 1-butene, where the second step at higher relative pressure (p/p0 > 0.55) is accompanied by an additional phase transition. This powder pattern resembles that of the as-synthesized MOF material containing solvent molecules in the pore system. The resulting structural changes of the material during guest and pressure induced external stimuli are evidenced by the new coupled XRD adsorption equipment.show moreshow less

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Metadaten
Document Type:Article (reviewed)
Zitierlink: https://opus.hs-offenburg.de/1948
Bibliografische Angaben
Title (English):Structural flexibility of a copper-based metal–organic framework: sorption of C4-hydrocarbons and in situ XRD
Author:Marcus LangeStaff Member, Merten Kobalz, Jens Bergmann, Daniel Lässig, Jörg Lincke, Jens MöllmerStaff MemberGND, Andreas Möller, Jörg Hofmann, Harald Krautscheid, Reiner StaudtStaff MemberGND, Roger Gläser
Year of Publication:2014
Creating Corporation:The Royal Society of Chemistry
First Page:8075
Last Page:8085
Parent Title (English):Journal of Materials Chemistry A
Volume:2
Issue:21
ISSN:2050-7496 (Elektronisch)
ISSN:2050-7488 (Print)
DOI:https://doi.org/10.1039/C3TA15331B
Language:English
Inhaltliche Informationen
Institutes:Fakultät Maschinenbau und Verfahrenstechnik (M+V)
Institutes:Bibliografie
GND Keyword:Oberflächenbehandlung
Formale Angaben
Open Access: Closed Access 
Licence (German):License LogoUrheberrechtlich geschützt