The effect of outgassing temperature on H2O and CO2 adsorption performance of MOFs & Zeolites


Date: Thursday 21 January 2021
Time:  15:00 GMT | 16:00 CET | 10:00 EST
Duration: 30 mins + Q&A
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Dr. Vladimir Martis
Product Manager

Join Surface Measurement Systems for the first webinar of 2021. Dr. Vladimir Martis will explore how proper selection of outgassing temperatures for MOFs and zeolites can affect sorption performance for gases and vapors, such as CO2 and water.
With a range of novel and interesting insights into the process being examined and the instruments and substance used, this will be an invaluable session for any researchers or labs working in this area.


Crystalline solids with controllable structures possess tailored porosity and large surface areas. This is particularly attractive for gas storage and separation applications. Physisorption of gases is a technique applied for the characterization of porous solids, such as zeolites and metal-organic frameworks (MOFs). Gravimetric vapor sorption and gas adsorption techniques measure promising functionalities such as removal of carbon dioxide (CO2) from the atmosphere or stability of sorbents in humid environments. Currently, both techniques are routinely applied for characterization of porous solids to explore adsorption capacities and porosity. However, only few studies focus on the pre-experimental conditions for the determination of gas/vapor sorption isotherms. Details of outgassing conditions, despite their importance, are often lacking in research publications.   Outgassing at low temperatures of thermally stable material provide an incomplete cleaning of the porous surface. As a result, the ability of sorbents to store CO2 or water molecules is underestimated based on adsorption data. Contrary, outgassing of temperature sensitive sorbent at elevated temperatures can cause irreversible structural changes which will have profound effects on the adsorption capacities. The impact of water adsorption on the structure was isolated by introducing partial pressures of water under vacuum. Such measurements provided a true water adsorption isotherm without unnecessary interference from a carrier gas. CO2 adsorption data were measured from low pressures up to 1bar. CO2 adsorption in the presence of water on the sorbent was collected in a system under vacuum. The results show that the performance of the sorbent can be significantly modified depending on outgassing conditions.

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