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Article Dans Une Revue Colloids and Surfaces A: Physicochemical and Engineering Aspects Année : 2016

Low temperature mechanism of adsorption of methane: Comparison between homogenous and heterogeneous pores

Résumé

! abstract The mechanisms of methane adsorption in (i) homogeneous carbon slit pores of widths between 1 nm and 2 nm and (ii) heterogeneous MOF pores of similar unit cell sizes have been compared. We discuss the mechanism of layering transition in subcritical conditions, for temperatures between 80 K and 180 K. The layer formation is strongly temperature-dependent. In slit pores it varies from a sharp adsorption at low temperatures to a more continuous uptake at higher temperatures. The pore size defines the number of adsorbed layers: the 1 nm pore allows adsorption of 2 layers while the 2 nm pore allows adsorption of 5 layers of methane molecules. We compare this behavior with the mechanism of adsorption in two MOFs, IRMOF-1 and IRMOF-16, with strongly heterogeneous walls (both structurally and energetically). This comparison allows us to discuss separately the influence of wall topology and intermolecular interactions on the mechanism of layering.
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hal-01477924 , version 1 (27-02-2017)

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Ege Dundar, Justyna Rogacka, Lucyna Firlej, Carlos Wexler, Philip Llewellyn, et al.. Low temperature mechanism of adsorption of methane: Comparison between homogenous and heterogeneous pores. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2016, 496, pp.86-93. ⟨10.1016/j.colsurfa.2015.11.063⟩. ⟨hal-01477924⟩
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