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Sorption of carbon dioxide by the composite sorbent “potassium carbonate in porous matrix”


Sorption of CO2 in the presence of water vapor by the K2CO3—γ-Al2O3 composite sorbent was studied by IR spectroscopy in situ, X-ray diffraction analysis, and the differentiating dissolution method and reasons for a decrease in its dynamic capacity are given. The samples containing K2CO3·1.5H2O in pores are characterized by the maximal dynamic capacity. A mechanism for CO2 sorption was proposed, which qualitatively explains the obtained dependence of the capacity on the water content in the composite sorbent. A high dynamic capacity can be maintained by regeneration of the sorbents by water vapor at 170 °N. The capacity of the sorbents decreases during the first 10 sorption—regeneration cycles due to the formation of an inactive phase of potassium aluminum carbonate.

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Okunev, A.G., Sharonov, V.E., Gubar", A.V. et al. Sorption of carbon dioxide by the composite sorbent “potassium carbonate in porous matrix”. Russian Chemical Bulletin 52, 359–363 (2003).

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  • composite sorbent
  • chemisorption
  • carbon dioxide
  • potassium carbonate
  • IR spectroscopy in situ