Hydrocarbon Adsorption in the Flexible Metal Organic Frameworks MIL-53(Al, Cr)
Citations Over TimeTop 10% of 2008 papers
Abstract
A general study of the adsorption of n-alkanes in the flexible metal organic framework (MOF) MIL-53 is presented. The roles of the length of the alkyl chain (n = 1-9), the nature of the metal (Al, Cr), and temperature were investigated. The shape of the adsorption curves is driven by the alkyl chain length of the n-alkanes. While traditional type-I isotherms are observed for short alkanes (n = 1, 2), adsorbates with longer chains induce clear substeps in the isotherm curves whose positions depend on the chain length. Such substeps are due to a breathing phenomenon, as proven by ex situ X-ray diffraction analysis. They strongly depend on the amount of adsorbate in the pores and on the nature of the metal (Al, Cr), which, for a given alkane, leads to a strong change in the substep positions despite the similar characteristics of the two metals. The adsorption kinetics are highly sensitive to small variations in temperature. Their detailed analysis in different regions of the isotherms shows in some cases the existence of distinct diffusion regimes and/or conformations within the flexible phases.
Related Papers
- → Theoretical study of the rhenium–alkane interaction in transition metal–alkane σ-complexes(2007)82 cited
- → Application of Brönsted’s principle of congruence toVEandCEof (cyclohexane or chlorobenzene or 1-chloronaphthalene + ann-alkane + anothern-alkane)(1995)3 cited
- → ESR spectroscopic observation of alkane aggregation and of hydrogen–proton transfer between alkane radical cations and alkane molecules in CCl3F matrices at cryogenic temperatures(1991)14 cited
- → Influence of addition of pure components on the structural state of multi-n-alkane mixtures(2001)9 cited