Webinar: The Isosteric Heat of Adsorption and Competitive Co-adsorption of H2O
with CO2 on Zeolites
Date: Thursday, 16 April 2020
Zeolites are extensively used in industrial adsorption applications for drying and purifying of gases, removal of volatile organic compounds (VOCs) as well as adsorption separations processes. Zeolites can be also used for removal of carbon dioxide emitted into the atmosphere causing abnormal climate changes. One of the methods to reduce CO2 levels in atmosphere is physical adsorption offering low energy consumption, fast adsorption rates, robust regeneration and stable performance. To understand the adsorption properties of zeolites, it is essential to study not only single component adsorption, for instance, CO2 or H2O but also the competitive co-adsorption behaviour of CO2 with H2O.
Another important parameter to consider is the heat released by the adsorption process, because it will influence the overall process in terms of the cost of energy that is required to control a column temperature, a change in adsorption equilibrium to lower adsorption capacity and the energy cost of desorption during adsorbent regeneration. The heat evolved by adsorption can be described as a differential heat of adsorption which is defined in thermodynamic models as the isosteric heat qst, which is the heat released by the transfer of gas at fixed adsorbate loading at a certain temperature and pressure. The isosteric heat of adsorption can be obtained from adsorption isotherms measured in a narrow temperature range via Clausius-Clapeyron equation.
In this webinar, we want to highlight Gravimetric Dynamic Vacuum Vapor Sorption Analyzer (DVS Vacuum) that is employed to measure water adsorption/desorption isotherms in a broad temperature range to calculate the isosteric heat of adsorption as well as competitive co-adsorption of CO2 with H2O.
Dr. Vladimir Martis is the DVS Product Manager for Porous Materials and Vacuum Product Specialist at Surface Measurement Systems. He received his Master’s degree in Materials Engineering from Trencin University of Alexander Dubcek, Slovakia in 2004. He received his engineering doctorate degree (EngD) in Molecular Modelling and Materials Simulation from Chemistry department, University College London in 2012. The thesis title: “Synchrotron radiation studies of multicomponent metal oxides.”
Since joining SMS in 2013, he has continued working on the development of advanced in-situ experimental surface science techniques using molecules as probes instead of X-rays for studying catalysts, zeolites, MOFs, polymers, freeze and spray dried materials, composites and glasses under relevant industrial conditions. Vladimir has authored several papers in peer-reviewed journals and presented at several international conferences.
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