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The effect of carbon dioxide purity on adsorption measurements

Fletcher, Ashleigh and Duffy, Johann and Smith, Malcolm and Davidson, Anne (2012) The effect of carbon dioxide purity on adsorption measurements. Journal of Physical Chemistry C. (Submitted)

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Abstract

The effect of activated carbon oxygen content on adsorption characteristics of commercially available, and in-situ purified, carbon dioxide (CO2) was investigated. Activated carbon, DARCO, was oxidized (DARCO-O2) and reduced (DARCO-H2), producing a suite of adsorbents with varying oxygen contents (4–22.4%), but similar porous characteristics. CO2 adsorption, at 195 K and 273 K, and up to 1 bar, was measured using commercially acquired and purified gases. Adsorption uptakes for both gases were similar for adsorption at 273 K; however, results for 195 K show a marked difference in uptake with gas purity and oxygen content. Results suggest the presence of water vapor depresses CO2 uptakes at lower temperatures, indicating the importance of adsorbate interactions in CO2 adsorption, with implications for appropriate standards and comparison of data for CCS technologies. Results obtained are discussed in terms of surface functional group content, adsorption capacities, adsorption kinetics and physical parameters.