K‐Promoted Hydrotalcites for CO2 Capture in Sorption Enhanced Reactions |
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| Authors: | Y‐J Wu P Li J‐G Yu A F Cunha A E Rodrigues |
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| Affiliation: | 1. Laboratory of Separation and Reaction Engineering (LSRE), Associated Laboratory LSRE/LCM, Department of Chemical Engineering, Faculty of Engineering University of Porto, Porto, Portugal;2. State Key Laboratory of Chemical Engineering, College of Chemical Engineering, East China University of Science and Technology(ECUST), Shanghai, China |
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| Abstract: | Potassium‐promoted hydrotalcite‐like material was prepared with potassium nitrate as the K precursor. The highest ever reported CO2 adsorption capacity (1.13 mol kg–1) was obtained at 656 K with p = 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 CO2 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. |
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| Keywords: | CO2 sorption Hydrotalcite‐like compound Sorption‐enhanced reaction |
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