Modeling adsorption of CO2 on amine-functionalized mesoporous silica. 2: Kinetics and breakthrough curves

Serna-Guerrero, Rodrigo; Sayari, Abdelhamid

doi:10.1016/j.cej.2010.04.042

Cited by 390 publications

(262 citation statements)

References 36 publications

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“…A further advantage of Avrami´s equation is that the kinetic constant is independent of the initial concentration of the adsorbate [55]. Serna-Guerrero et al [34] also found that the pseudo-first and pseudo-second order kinetic models showed certain limitations for describing CO 2 adsorption on amine-functionalized mesoporous silica and reported that the best kinetic model fit was provided by Avrami´s equation. This model has already been successfully employed to explain kinetic processes on a wide range of adsorbents and adsorbates [38,54,56].…”

Section: Comparison Of Kinetic Modelsmentioning

confidence: 99%

“…As can be seen in Table 3 the experimental data at low and high surface coverage is most likely associated with its ability to account for complex reaction pathways [29,34,54]. A further advantage of Avrami´s equation is that the kinetic constant is independent of the initial concentration of the adsorbate [55].…”

Section: Comparison Of Kinetic Modelsmentioning

confidence: 99%

“…The pseudo-first order model represents a reversible interaction between adsorbent and adsorbate which is suitable for predicting the physical adsorption of CO 2 on solid sorbents [27,34].…”

Section: Pseudo-first Order Modelmentioning

confidence: 99%

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

Álvarez-Gutiérrez

Gil

Rubiera

et al. 2017

Chemical Engineering Journal

177

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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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Section: Comparison Of Kinetic Modelsmentioning

confidence: 99%

Section: Comparison Of Kinetic Modelsmentioning

confidence: 99%

See 1 more Smart Citation

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

Álvarez-Gutiérrez

Gil

Rubiera

et al. 2017

Chemical Engineering Journal

177

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“…Sayari's group further demonstrated the formation of urea groups, which was stable in desorption, would result in the deactivation of the amine-grafted adsorbents. They, therefore, suggested using humid streams to prevent the deactivation and to improve the stability of amine-based adsorbents (Belmabkhout et al, 2009;Belmabkhout and Sayari, 2010;Belmabkhout et al, , b, 2011aSayari, 2006, 2007;Sayari and Belmabkhout, 2010;Serna-Guerrero and Sayari, 2010;Serna-Guerrero et al, 2010a, b, c, d).…”

Section: Amine-grafted Adsorbentmentioning

confidence: 99%

A Review of CO2 Capture by Absorption and Adsorption

Huang

Tan

2012

Aerosol Air Qual. Res.

1,461

875

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Global warming resulting from the emission of greenhouse gases, especially CO 2 , has become a widespread concern in the recent years. Though various CO 2 capture technologies have been proposed, chemical absorption and adsorption are currently believed to be the most suitable ones for post-combustion power plants. The operation of the chemical absorption process is reviewed in this work, together with the use of absorbents, such as the ionic liquid, alkanolamines and their blended aqueous solutions. The major concerns for this technology, including CO 2 capture efficiency, absorption rate, energy required in regeneration, and volume of absorber, are addressed. For adsorption, in addition to physical adsorbents, various mesoporous solid adsorbents impregnated with polyamines and grafted with aminosilanes are reviewed in this work. The major concerns for selection of adsorbent, including cost, adsorption rate, CO 2 adsorption capacity, and thermal stability, are compared and discussed. More effective and less energy-consuming regeneration techniques for CO 2 -loaded adsorbents are also proposed. Future works for both absorption and adsorption are suggested.

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“…Serna-Guerrero and coworker installed MS to the outlet of a fixed-bed reactor for collecting CO2 and H2O breakthrough data and their elution curves. 23 The concentrations of CO2 and H2O were determined using a single ion monitor (SIM) with m/z = 44 and m/z = 18, respectively. Since the gas flow rate in the practical reactor is much higher than that required by MS, the gas flow must be split before entering MS, which would result in measurement errors.…”

Section: Introductionmentioning

confidence: 99%