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Regeneration strategies of carbon capture adsorbents in cyclic operation

AuthorsJunco, S.; González Plaza, Marta ; Fernández Martín, Claudia ; Pevida García, Covadonga ; Rubiera González, Fernando ; Pis Martínez, José Juan
Issue Date2010
CitationECCRIA 8 (2010)
AbstractReduction of carbon dioxide emissions on an industrial scale requires the development of low-cost capture methods. Adsorption is considered a promising technology for CO2 capture applications since adsorbents present high adsorption capacity, great selectivity, good mechanical properties and they remain stable over repeated adsorption-desorption cycles. Selective adsorption of CO2 on inorganic and organic adsorbents like zeolites, silica gels, aluminas and activated carbons is used commercially for separation of bulk CO2 from a gas mixture and removal of trace CO2 from a contaminated gas. The varied morphology and surface chemistry of these adsorbents give rise to different characteristics for adsorption of CO2 as a pure gas or as a component of a gas mixture. The practical CO2 separation using adsorbents generally involves cyclic adsorption-desorption processes where regeneration can be conducted by lowering the pressure of the system (Pressure Swing Adsorption, PSA, or Vacuum Swing Adsorption, VSA), increasing the temperature of the adsorption bed (Temperature Swing Adsorption, TSA) or a combination of both. These processes often consist of a series of cyclic unsteady-state steps in order to (i) increase the net CO2 working capacity of the adsorbent, (ii) decrease the energy required for adsorbent regeneration, (iii) decrease the amount of purge gas required for CO2 desorption, and (iv) increase the net recovery of the desired product gas at high purity. Thus, optimisation of the regeneration conditions is a critical step in the design and performance of an adsorption process and it influences significantly its cost. In this work, different strategies for the regeneration of carbon adsorbents to be applied in cyclic CO2 capture processes, at atmospheric and high pressures, have been evaluated. For this purpose a bench-scale fixed bed reactor with temperature and pressure control and fully automated was designed and built. Regeneration of adsorbents by means of pressure swings between 0.05 mbar and 15 bar and/or temperature changes in the range 25 ¿ 100 ºC have been studied. The working capacities of the tested carbon adsorbents under cyclic operation have also been assessed.
DescriptionResumen del póster presentado a la 8th European Conference on Coal Research and its Applications celebrado en Leeds (UK) del 6 al 8 de septiembre de 2010.
Publisher version (URL)http://www.eccria.org/ibis/eccria-2010/homepage
Appears in Collections:(INCAR) Comunicaciones congresos
(CIAL) Comunicaciones congresos
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