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Title

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

AuthorsÁlvarez Gutiérrez, Noelia CSIC; Gil Matellanes, María Victoria CSIC ORCID ; Rubiera González, Fernando CSIC ORCID ; Pevida García, Covadonga CSIC ORCID
KeywordsBiomass-based activated carbon
Biogas
CO2 capture
Breakthrough tests
Kinetic model
Issue Date17-Aug-2016
PublisherElsevier
CitationChemical Engineering Journal 307: 249-257 (2017)
AbstractMost practical applications of solids in industry involve porous materials and adsorption processes. A correct assessment of the equilibrium and kinetics of adsorption is extremely important for the design and operation of adsorption based processes. In our previous studies we focused on the evaluation of the equilibrium of CO2/CH4 adsorption on cherry stone-based carbons. In the present paper the kinetics of adsorption of CO2 on two cherry stone-based activated carbons (CS-H2O and CS-CO2), previously prepared in our laboratory, has been evaluated by means of transient breakthrough experiments at different CO2/CH4 feed concentrations, at atmospheric pressure and 30 °C. A commercial activated carbon, Calgon BPL, has also been evaluated for reference purposes. Three models have been applied to estimate the rate parameters during the adsorption of CO2 on these carbons, pseudo-first, pseudo-second and Avrami´s fractional order kinetic models. Avrami´s model accurately predicted the dynamic CO2 adsorption performance of the carbons for the different feed gas compositions. To further investigate the mechanism of CO2 adsorption on CS-H2O, CSCO2 and Calgon BPL, intra-particle diffusion and Boyd´s film-diffusion models were also evaluated. It was established that mass transfer during the adsorption of CO2 from CO2/CH4 is a diffusion-based process and that the main diffusion mechanisms involved are intra-particle and film diffusion. At the initial stages of adsorption, film diffusion resistance governed the adsorption rate, whereas intra-particle diffusion resistance was the predominant factor in the following stages of adsorption.
Publisher version (URL)http://dx.doi.org/10.1016/j.cej.2016.08.077
URIhttp://hdl.handle.net/10261/139515
DOI10.1016/j.cej.2016.08.077
ISSN1385-8947
Appears in Collections:(INCAR) Artículos




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