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O: Fachverband Oberflächenphysik
O 102: Heterogeneous Catalysis on Metals
O 102.10: Vortrag
Donnerstag, 19. März 2020, 13:00–13:15, TRE Phy
Characterisation of Disordered Porous Solids: Perspectives from the Serially Connected Pore Model — •Henry R. N. B. Enninful1, Richard Kohns1,2, Dirk Enke1, and Rustem Valiullin1 — 1Universität Leipzig, Leipzig, Germany — 2Philipps Universität Marburg, Marburg, Germany
Elaborate determination of the pore structure of mesoporous solids offers important guidance towards optimal design of various applications such as catalysis, molecular separations and adsorption, among others. Routinely used characterisation tools, such as gas sorption, typically utilise the general adsorption isotherm (GAI) equation derived for ordered pore systems. The complex morphology of disordered porous solids, with its resulting cooperativity effects in thermodynamic phase transitions, renders characterisation more complex than what the GAI provides.
In this talk, we present a recently developed serially connected pore model (SCPM), which extends the GAI by incorporating cooperativity effects in phase transitions arising from pore complexity. Modelled as statistically disordered linear chain of pores, the SCPM will be validated with data from phase transitions in a synthesized porous silica material of similar pore construct, MCM-41. As an analogue to gas sorption (adsorption/desorption) studies, solid-liquid phase transitions (freezing/melting) of water in porous materials will be employed to correlate with the theoretical model.
References [1] Scientific Reports, 7, 7216, 2017. [2] Journal of Physical Chemistry C, 123, 16239, 2019.