Adsorption equilibria and kinetics of CO2 and N2 on activated carbon beads

Shen, Chunzhi; Grande, Carlos A.; Li, Ping; Yu, Jianguo; Rodrigues, Alı́rio E.

doi:10.1016/j.cej.2009.12.005

Cited by 149 publications

(85 citation statements)

References 39 publications

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“…However, when comparing the values of the pure component isotherms presented in this paper with results measured on comparable materials, the adsorbed amounts agree quite well and show the same trends (Hwang et al 1991;Park et al 1998;Humayun and Tomasko 2000;SudibanFig. 9 Comparison of the binary adsorption of CO 2 (triangles) and H 2 (circles) on activated carbon at 25°C and 3.0 MPa predicted by IAST with the isotherm parameters of the pure Langmuir or Sips isotherms; Symbols: experimental results, solid lines: Sips IAST, dashed lines: Langmuir IAST driyo et al 2003;Shen et al 2010;Grande et al 2008;Lopes et al 2009). Consequently, the activated carbon adsorbent seems to be suitable for the separation of CO 2 /H 2 mixtures by a pressure swing adsorption (PSA) process.…”

Section: Discussionsupporting

confidence: 78%

Pure and binary adsorption of CO2, H2, and N2 on activated carbon

et al. 2011

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A new developing field of application for pressure swing adsorption (PSA) processes is the capture of CO 2 to mitigate climate change, especially the separation of CO 2 and H 2 in a pre-combustion context. In this process scheme the conditions of the feed to the separation step, namely a pressure of 3.5 to 4.5 MPa and a CO 2 fraction of around 40% are favorable for an adsorption based separation process and make PSA a promising technology. Among the commercial adsorbent materials, activated carbon is most suitable for this application. To evaluate the potential, to benchmark new materials, and for process development a sound basis of the activated carbon thermodynamic data is required, namely equilibrium adsorption isotherms of the relevant pure components and mixtures, Henry's constants and isosteric heats.In this work pure adsorption equilibria of CO 2 , H 2 and N 2 on commercial activated carbon (AP3-60 from Chemviron, Germany) are measured using a Rubotherm Magnetic Suspension Balance (MSB) (Bochum, Germany) in a wide temperature and pressure range. The data is used to fit the temperature dependent parameters of Langmuir and Sips (Langmuir-Freundlich) isotherms and to determine the Henry's constants as well as isosteric heats. Based on this evaluation different methods to evaluate the data are compared and discussed. With the pure isotherm parameters of the Sips isotherm binary adsorption is predicted using an empirical binary Sips equation and ideal adsorbed solution theory (IAST). The results are compared to binary measurements in the same MSB applying a gravimetricchromatographic method. Notation a parameter for temperature dependent description of n ∞ i [mmol/g] A specific surface of the adsorbent (Gibbs Adsorption isotherm) [m 2 /kg] A parameter for temperature dependent description of k i [1/MPa] b parameter for temperature dependent description of n ∞ i [J/mol] B parameter for temperature dependent description of k i [J/mol] c exponent in Sips isotherm [-] C parameter for temperature dependent description of H i [mmol/g/MPa] D parameter for temperature dependent description of H i [J/mol] E squared error from isotherm fitting [(mmol/g) 2 ] g weighting factor (final) [-] H Henry's constant [mmol/g/MPa] H heat of adsorption [kJ/mol] k isotherm equilibrium constant [1/MPa] m mass [g] M 1 weight at measuring point 1 [g] M 0 1 weight at measuring point 1 under vacuum [g] M molar mass [g/mol] n molar adsorption per unit mass of adsorbent [mmol/g] N number of experimental data points at one temperature (one component) [-] 50 Adsorption (2012) 18:49-65 p pressure [MPa] r weighting factor [-] R ideal gas constant [J/mol/K] S selectivity [-] t weighting factor [-] T Temperature [K] V Volume [cm 3 ] V 0 Volume of lifted metal parts and adsorbent [cm 3 ] V void Void volume of the adsorption system [cm 3 ] V 2 second virial coefficient for isotherm description [g/mmol] V 3 third virial coefficient for isotherm description [g 2 /mmol 2 ] w mass fraction [-] y mole fraction in fluid [-] z mole fraction in adsorbed ph...

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Section: Discussionsupporting

confidence: 78%

Pure and binary adsorption of CO2, H2, and N2 on activated carbon

et al. 2011

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“…However, for a large-and/or industrial-scale PSA process, the modeling or simulation should include external and/or internal mass realistic models to simulate measured single and binary breakthrough curves [57][58][59].…”

Section: The Good Agreement Between Experiments and Simulations Indicmentioning

confidence: 99%

Utilizing transient breakthroughs for evaluating the potential of Kureha carbon for CO2 capture

Wang

et al. 2015

Chemical Engineering Journal

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“…(2) or (3)), while the external mass transfer coefficient k ext is evaluated by means of the Wakao and Funazkri correlation [37,38].The axial dispersion in the column can be evaluated through the Péclet number Pe ¼ uL eDax , where D ax is computed as dictated by the Edwards and Richardson equation [38].…”

Section: Mathematical Modeling Of Adsorption Datamentioning

confidence: 99%