6533b837fe1ef96bd12a25de

RESEARCH PRODUCT

Theoretical and Experimental Studies of Capillary Hysteresis in MCM-41

S.c. O´domhnaillPeter I. RavikovitchPeter I. RavikovitchFerdi SchüthFerdi SchüthK.k. UngerAlexander V. Neimark

subject

Condensed Matter::Materials ScienceHysteresisAdsorptionMaterials scienceMCM-41Capillary actionMetastabilityDesorptionThermodynamicsDensity functional theoryMesoporous material

description

Mesoporous materials of MCM-41 type are considered to be reference model adsorbents due to their regular pore structure. Nitrogen adsorption isotherms on MCM-41 are modeled using the Non-Local Density Functional Theory (NLDFT). The thermal dependence of the thermodynamic hysteresis predicted by the NLDFT is confirmed by experimental measurements. The nitrogen hysteresis on MCM-41 at temperatures below 77.4 K or in pores greater than 4 nm is associated with the metastability of the adsorption branch of the isotherm. In the hysteresis regime, the desorption branch is likely to be thermodynamically stable and is recommended for calculating pore size distributions.

https://doi.org/10.1007/978-1-4613-1375-5_83