Other
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mfpt....2..330w&link_type=abstract
Sixth Microgravity Fluid Physics and Transport Phenomena Conference: Exposition Topical Areas 1-6, vol. 2, p. 330-341
Other
Carbon Dioxide, Separators, Carbon Monoxide, Activated Carbon, Adsorbents, Mars Atmosphere, Isotherms, Low Pressure, Operating Temperature
Scientific paper
The overall goal of this part of our research is to determine experimentally the adsorption equilibrium data that will enable efficient design of a separation process to remove carbon dioxide from a CO/CO2 mixture. An effective separation process will depend on the adsorbent capacity for both the strongly and weakly adsorbed components at the desired operating temperature and pressure ranges, as well as regeneration requirements. Pure component and binary adsorption isotherms are used to determine the most CO2- selective adsorbent. A quick uptake of pure CO2 on a given adsorbent at low pressures compared to the uptake of pure CO on the same adsorbent indicates that CO2 molecules have a much stronger interaction with the adsorbent surface than CO. This is a necessary property for successful separation by adsorption. Adsorption isotherms are widely available in the literature for many pure components on various adsorbents. Pure component isotherms can be found in various publications and data handbooks for CO and CO2 on activated carbon and many zeolites. However, the pressure range seldom extends beyond 300 kPa, and the temperature is usually limited as well. Binary adsorption data are much less abundant and are more difficult to measure experimentally. There are models that can predict binary adsorption from the pure component isotherms, but such models rarely provide the desired accuracy. Hence it is necessary to determine both pure component and binary adsorption isotherms to accurately design the separation system.
LeVan Douglas M.
Walton Krista S.
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