Potential adsorption theory (PAT) suggested by Polanyi back in 1914 is till date one of the most widely used practical methodologies for the treatment of gas adsorption on microporous materials. Here, we extend PAT to the description of the phenomenon of adsorption-induced deformation, which has been recently attracting widespread interest of various scientific communities, from adsorption separations and energy storage to hydrocarbon recovery and carbon dioxide sequestration to drug delivery and actuators. A universal relationship is established between the stress caused by the interactions of guest molecules with the pore walls and the adsorption isotherm. It is shown that in the course of adsorption, microporous solids exhibit a non-monotonic deformation, with contraction at low gas pressures and expansion as the pressure increases. The proposed theory is verified with the experimental data on benzene and n-hexane adsorption on AR-V microporous carbon over a wide range of temperatures. It allows for predicting the adsorption deformation at different temperatures and with different adsorbates and can be applied to a wide class of microporous solids.

Aluminum-based metal–organic framework (MOF) CAU-10-H is a promising candidate for heat transformation and water harvesting applications due to its hydrothermal stability, beneficial step-wise water adsorption isotherm and low toxicity. In...

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The H 2 sorption properties of the aluminophosphate zeolites AlPO 5, AlPO 31, AlPO 11, AlPO 36, and AlPO 8 at 77 K have been investigated. A series of H 2 adsorption isotherms has been obtained for cylin drical micropore channels in the aluminophosphate zeolites. The absolute values of the amount adsorbed α(P) for the mesoporous aluminophosphate materials and the effective density of adsorbed H 2 in the micropore space β*(P, d) have been determined. It has been demonstrated experimentally that the sorbate density depends on the size of the micropore channel of the zeolite d. Hydrogen sorption isotherms have been calculated from experimental isotherms. A procedure allowing β*(P, d) to be estimated for intermediate d values is presented.

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