Adsorption performance indicators for the CO2/CH4 separation: Application to biomass-based activated carbons

Álvarez-Gutiérrez, N.; Gil, M.V.; Rubiera, F.; Pevida, C.

doi:10.1016/j.fuproc.2015.10.038

Cited by 91 publications

(54 citation statements)

References 69 publications

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“…However, for a more precise evaluation the working capacities (differences between the gas uptakes of both components under adsorption and regeneration conditions) and the heat required for the regeneration of the adsorbent would also need to be taken into account [36].…”

Section: Selectivity To Co 2 Separationmentioning

confidence: 99%

Phenol-Formaldehyde Resin-Based Carbons for CO2 Separation at Sub-Atmospheric Pressures

et al. 2016

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Abstract:The challenge of developing effective separation and purification technologies that leave much smaller energy footprints is greater for carbon dioxide (CO 2 ) than for other gases. In addition to its involvement in climate change, CO 2 is present as an impurity in biogas and bio-hydrogen (biological production by dark fermentation), in post-combustion processes (flue gas, CO 2 -N 2 ) and many other gas streams. Selected phenol-formaldehyde resin-based activated carbons prepared in our laboratory have been evaluated under static conditions (adsorption isotherms) as potential adsorbents for CO 2 separation at sub-atmospheric pressures, i.e., in post-combustion processes or from biogas and bio-hydrogen streams. CO 2 , H 2 , N 2 , and CH 4 adsorption isotherms at 25˝C and up to 100 kPa were obtained using a volumetric equipment and were correlated by applying the Sips model. Adsorption equilibrium was then predicted for multicomponent gas mixtures by extending the multicomponent Sips model and the Ideal Adsorbed Solution Theory (IAST) in conjunction with the Sips model. The CO 2 uptakes of the resin-derived carbons from CO 2 -CH 4 , CO 2 -H 2 , and CO 2 -N 2 at atmospheric pressure were greater than those of the reference commercial carbon (Calgon BPL). The performance of the resin-derived carbons in terms of equilibrium of adsorption seems therefore relevant to CO 2 separation in post-combustion (flue gas, CO 2 -N 2 ) and in hydrogen fermentation (CO 2 -H 2 , CO 2 -CH 4 ).

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Section: Selectivity To Co 2 Separationmentioning

confidence: 99%

Phenol-Formaldehyde Resin-Based Carbons for CO2 Separation at Sub-Atmospheric Pressures

et al. 2016

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“…Previous research conducted in our laboratory has successfully demonstrated the great potential of cherry stone-based carbons for biogas upgrading. They were tested for their CO 2 and CH 4 equilibrium adsorption capacities at high pressures under static [19] and dynamic conditions in a purpose-built lab-scale fixed-bed unit [20].…”

Section: Introductionmentioning

confidence: 99%

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

Álvarez-Gutiérrez

Gil

Rubiera

et al. 2017

Chemical Engineering Journal

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173

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Most 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 CO 2 /CH 4 adsorption on cherry stone-based carbons. In the present paper the kinetics of adsorption of CO 2 on two cherry stone-based activated carbons (CS-H 2 O and CS-CO 2 ), previously prepared in our laboratory, has been evaluated by means of transient breakthrough experiments at different CO 2 /CH 4 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 CO 2 on these carbons, pseudo-first, pseudo-second and Avrami´s fractional order kinetic models. Avrami´s model accurately predicted the dynamic CO 2 adsorption performance of the carbons for the different feed gas compositions. To further investigate the mechanism of CO 2 adsorption on CS-H 2 O, CS-CO 2 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 CO 2 from CO 2 /CH 4 is a diffusion-based process and that the main diffusion mechanisms involved 2 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.

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“…The selectivity of CO 2 over CH 4 for the CNS at 1 bar and 30 • C was approximately 3.6. It was found that the value of selectivity was comparable to that of carbon-based adsorbents [49].…”

Section: Adsorption Selectivitymentioning

confidence: 74%

Preparation and Evaluation of a Coconut Shell-Based Activated Carbon for CO2/CH4 Separation

et al. 2018

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Biomass is a widely distributed and renewable source of carbon. The main objective of this work is to produce an activated carbon from coconut shells with suitable characteristics to separate CO 2 from biogas. The textural characterization of the adsorbent has been determined. Pure component adsorption isotherms of CO 2 and CH 4 at 30, 50 and 70 • C have been measured. The results reveal that the activated carbon had high CO 2 adsorption capacity. Equilibrium of adsorption of CO 2 and CH 4 adsorption on the produced activated carbon reached 8.36 mmol/g and 4.63 mmol/g, respectively, at 30 • C and 10 bars. Moreover, the performance of the produced activated carbon, as a potential adsorbent for CO 2 capture from a CO 2 /CH 4 gas mixture, has been evaluated under dynamic conditions in a dedicated fixed-bed setup. The CO 2 and CH 4 adsorption capacities of the produced activated carbon are estimated to be 1.86 and 0.52 mol/kg, respectively, at 30 • C and 1 bar.

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Adsorption performance indicators for the CO2/CH4 separation: Application to biomass-based activated carbons

Cited by 91 publications

References 69 publications

Phenol-Formaldehyde Resin-Based Carbons for CO2 Separation at Sub-Atmospheric Pressures

Phenol-Formaldehyde Resin-Based Carbons for CO2 Separation at Sub-Atmospheric Pressures

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

Preparation and Evaluation of a Coconut Shell-Based Activated Carbon for CO2/CH4 Separation

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