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K‐Promoted Hydrotalcites for CO 2 Capture in Sorption Enhanced Reactions
Author(s) -
Wu Y.J.,
Li P.,
Yu J.G.,
Cunha A. F.,
Rodrigues A. E.
Publication year - 2013
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201200694
Subject(s) - hydrotalcite , adsorption , isothermal process , sorption , desorption , chemistry , potassium , chemical engineering , thermodynamics , organic chemistry , catalysis , engineering , physics
Potassium‐promoted hydrotalcite‐like material was prepared with potassium nitrate as the K precursor. The highest ever reported CO 2 adsorption capacity (1.13 mol kg –1 ) was obtained at 656 K with p CO 2 = 0.5 bar at humid conditions. A mathematical model was developed and it satisfactorily simulated the adsorption and desorption processes. The stability of the material was tested with repeated adsorption/desorption cycles; the CO 2 adsorption capacity decreased around 7 % after ten cycles. In addition, regeneration was performed with temperature swing operation (from 656 K to 708 K), where a complete regeneration was achieved within 60 min, which reduced to half the time required for regeneration under isothermal conditions.