An investigation of CO2 adsorption kinetics on porous magnesium oxide

Song, Gan; Zhu, Xun; Chen, Rong; Liu, Qiang; Ding, Yudong; Chen, Lin

doi:10.1016/j.cej.2015.07.055

Cited by 224 publications

(116 citation statements)

References 49 publications

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“…Theoretically, the pseudo first-order model generally provides good fit when the mass of an adsorbate on an adsorbent surface is low and the adsorption amount reaches a plateau, whereas the pseudo second-order model is suitable when the concentration of an adsorbate on an adsorbent is high, and the adsorption amount does not reach an equilibrium (Song et al, 2016). In other words, the pseudo second-order model is suitable to demonstrate the dependency of adsorption rate on the sorption capacity of a surface (Aharoni and Tompkins, 1970;Ho and Ofomaja, 2006;Valderrama et al, 2007;Cáceres-Jensen et al, 2013).…”

Section: Adsorption Kinetics Studymentioning

confidence: 99%

“…In furtherance, the kinetics of CO 2 adsorption was also investigated using four different models viz: pseudo-first order and pseudo-second order models (chemical reaction models), intraparticle diffusion model (diffusion adsorption model) and Elovich equation (mass transfer model) (Ozacar and Sengil, 2005;Mittal et al, 2007;Anirudhan and Suchithra, 2010;Yousef et al, 2011;Shah and Imae, 2016;Song et al, 2016). Their expressions are as given in Eqs.…”

Section: Adsorbentmentioning

confidence: 99%

“…In our review publication (Adelodun et al, 2015), it was inferred that the pre-tethering of potassium active sites for the anchorage of SNFs during amine-stabilization was more efficient that those achieved with dry pre-oxidation with O3-UV (Adelodun et al, 2014a(Adelodun et al, , b, 2015. The chemical impregnation of basic chemical groups such as SNFs, alkali metals or their oxides on AC surface results in the decrease of pure CO 2 adsorption capacity while selective capture efficiency is enhanced (Song et al, 2016). This was attributed to the fact that the capture of CO 2 from pure feed depends largely on the VT/Vmicro whilst its selective separation from a matrix is driven by the amount and nature of the basic sites with reasonably high level of affinity for the adsorbate (Shafeeyan et al, 2010;Adelodun and Jo, 2013;Adelodun et al, 2014a, b).…”

Section: Co 2 Adsorptionmentioning

confidence: 99%

“…Among these, adsorption capacity is considered as the most important property that is initially determined (Brdar et al, 2012). It has also been suggested that when describing adsorption properties, isotherm, thermodynamic and kinetic studies are required in order to fully understand the nature, mechanism and rate of the process prior to designing the application setup (Qui et al, 2009;Yousef et al, 2011;Song et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

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Detailed assessments of adsorption properties (isotherm, thermodynamics and kinetics) were carried out on chemically modified activated carbon (AC). Some pretreatment methods prior amination have been used to improve the CO 2 selective capture of AC in our previous works. Here, the inter-relationships among the adsorption properties were further investigated and reported. It was found that CO 2 molecules bind onto the heterogeneous surfaces of AC in a monolayer pattern as experimental data fit Freundlich isotherm rather than Langmuir. However, Redlich-Peterson, a 3-parameter model provided the best fit. The highest degree of precision of Chi-square analysis professed it as the most efficient error function for the isotherm study. Values of standard entropy showed to be the most significant thermodynamic limiting parameter in the adsorption process, as physisorption was found predominant for CO 2 collection at the interface. This observation was corroborated with temperature programmed desorption (TPD) analysis where ca. 86% of adsorbed CO 2 were desorbed below 500°C. The kinetic study indicated that CO 2 -AC interaction follows pseudo-second order while the higher R 2 of intraparticle diffusion over Elovich equation confirmed the deduction made from the thermodynamic study. Conclusively, the study of adsorption properties in this work provides useful information for designing proper adsorption reactor and subsequent regeneration of CO 2 -laden adsorbents at environmental levels.

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Section: Adsorption Kinetics Studymentioning

confidence: 99%

Section: Adsorbentmentioning

confidence: 99%

Section: Co 2 Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

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“…For porous sorbents such as activated carbons, diffusion effects may be quite important and so the physical meaning of the evaluated rate constant must be determined in order to be able to know the mass transfer mechanism involved [42,43]. Most commonly, the rate of adsorption is controlled by film diffusion or intra-particle diffusion or both [21,44,45].…”

Section: Adsorption Mechanismmentioning

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

176

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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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