High Pressure CO2 and CH4 Sorption on Zeolites
Zeolites are used in high pressure gas storage and separation applications of carbon dioxide and methane gases. In order to understand their potential usefulness in high pressure applications, the CO₂ and CH₄ uptake of zeolites at high pressures is directly measured using a static volumetric technique. Recommendations for obtaining accurate data and the resulting isotherms are discussed.
Introduction
Zeolites have shown potential in gas storage applications because of their large pore volume and high surface areas and in gas separation applications based on size and shape due to their narrow micropore size distributions. Zeolites are typically low cost, readily available, and relatively stable, which are necessary requirements for these applications. CO2 and CH4 are both of industrial importance for gas storage and separation applications. To directly assess the gas storage capacity of zeolites for CO2 and CH4, high pressure gas sorption measurements are recommended.
High pressure sorption measurements are typically performed at the temperature and up to the pressure of interest for the application. Measured high pressure isotherms are obtained as surface excess adsorption vs. absolute pressure. The surface excess is itself a useful and interesting value, but for gas storage applications, it should be converted to the more relevant absolute adsorption capacities. This can be done using either the pore volume measured from low pressure gas sorption or the bulk liquid density [1, 2].
References
- Senkovska, I.; Cychosz, K.A.; Llewellyn, P.; Thommes, M.; Kaskel, S. In: The Chemistry of Metal-Organic Frameworks: Synthesis, Characterization, and Applications. Ed. S. Kaskel, Wiley, 2016.
- Moellmer, J.; Celer, E.B.; Luebke, R.; Cairns, A.J.; Staudt, R.; Eddaoudi, M.; Thommes, M. Microporous Mesoporous Mater., 2010, 129, 345-353.
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