Experimental and modeling investigation of adsorption equilibrium of CH4, CO2, and N2 on activated carbon and prediction of multi-component adsorption equilibrium

Ghalandari, Vahab; Hashemipour, Hassan; Bagheri, Hamidreza

doi:10.1016/j.fluid.2019.112433

Cited by 41 publications

(12 citation statements)

References 46 publications

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“…When the mixed gas consists of two gas components, the total adsorption amount q t equals the simple summation of q 1 and q 2 described as Eq. (12). Then, Eqs.…”

Section: Theorymentioning

confidence: 99%

“…The Sips equation [7] and the Toth equation [8] are also applicable as expanded forms of the Langmuir equation with additional parameters. These isotherms have the potential to improve estimation accuracy when the parameters are fitted properly [9][10][11][12], but the additional parameters generally increase the difficulty of parameter decision and also the deduction of the isotherm equations of mixed gases.…”

Section: Introductionmentioning

confidence: 99%

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Measurements and calculations of the equilibrium adsorption amounts of CO2–N2, CO–N2, and CO2–CO mixed gases on 13X zeolite

Shigaki¹,

Mogi²,

Haraoka³

et al. 2020

SN Appl. Sci.

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Pressure swing adsorption (PSA) is one practical process for CO 2 separation from the exhaust gases in various industries, such as blast furnace gas in steel works. For optimum design of the PSA process, precise estimation of the adsorption equilibrium of mixed gases is desired. The ideal adsorbed solution (IAS) model is a reliable model for this estimation. However, the IAS model requires convergent calculations, which significantly increase the calculation load, especially in dynamic PSA simulations. An analytical formula such as the extended Langmuir (EX-LM) equation is more useful for calculation of the equilibrium adsorption amounts of mixed gases. A drawback of this equation, however, is the uncertainty of the thermodynamic consistency and consequently the accuracy of the calculation results. In order to clarify the necessary conditions for application of the EX-LM equation as an approximation of the IAS model with Langmuir equation (IAS-LM model), both the analytical features and the estimation accuracy of these different methods were evaluated. To evaluate the accuracy of the equations, the equilibrium adsorption amount of mixed gases consisting of CO 2 , N 2 , and CO, which are the major gas components of blast furnace gas in steel works, on 13X zeolite were measured experimentally. The results confirmed that the accuracy of the EX-LM equation varies depending on the gas pressure and also the affinities of the adsorbates. Under higher gas pressure conditions, more reliable calculation results were obtained by the IAS-LM model.

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“…When the mixed gas consists of two gas components, the total adsorption amount q t equals the simple summation of q 1 and q 2 described as Eq. (12). Then, Eqs.…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurements and calculations of the equilibrium adsorption amounts of CO2–N2, CO–N2, and CO2–CO mixed gases on 13X zeolite

Shigaki¹,

Mogi²,

Haraoka³

et al. 2020

SN Appl. Sci.

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“… 29 , 30 Physical and chemical characteristics have been the focus of recent studies. 24 , 31 , 32 Direct biomass carbonization produces carbons with low specific surface areas or even nonporous carbons, which are inefficient for gas capture. 29 …”

Section: Introductionmentioning

confidence: 99%

Adsorption Equilibrium, Thermodynamic, and Kinetic Study of O₂/N₂/CO₂ on Functionalized Granular Activated Carbon

et al. 2022

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A volumetric system was used to assess carbon-based adsorbents for evaluation of the gas separation, equilibrium, and kinetics of oxygen (O 2 ), nitrogen (N 2 ), and carbon dioxide (CO 2 ) adsorption on granular activated carbon (GAC) and functionalized GAC at 298, 308, and 318 K under pressures up to 10 bar. The effects of ZnCl 2 , pH, arrangement of the pores, and heat-treatment temperature on the adsorptive capabilities of O 2 , N 2 , and CO 2 were evaluated. High-performance O 2 adsorption resulted with a fine sample (GAC-10-500) generated with a 0.1 wt % loading of ZnCl 2 . The optimal sample structure and morphology were characterized by field-emission scanning electron microscopy, Fourier transform infrared spectroscopy, and powder X-ray diffraction. On the basis of the adsorption–desorption results, the fine GAC provides a surface area of 719 m 2 /g. Moreover, it possessed an average pore diameter of 1.69 nm and a micropore volume of 0.27 m 3 /g. At 298 K, the adsorption capacity of the GAC-10-500 adsorbent improved by 19.75% for O 2 but was not significantly increased for N 2 and CO 2 . Isotherm and kinetic adsorption models were applied to select the model best matching the studied O 2 , N 2 , and CO 2 gas uptake on GAC-10-500 adsorbent. At 298 K and 10 bar, the sip isotherm model with the highest potential adsorption difference sequence and gas adsorption difference compared with pure GAC adsorbent as O 2 > N 2 > CO 2 follows well for GAC-10-500. Eventually, the optimal sample is more effective for O 2 adsorption than other gases.

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“…The mS parameter gives information about the degree of surface non-homogeneity. Heterogeneous adsorbents present mS values close to 0, while mS values closer to 1 indicate a material with relatively homogeneous binding sites [64]. Pine bark presents an mS value closer to 1, suggesting that its binding sites have the same adsorption affinity, homogeneously distributed over its surface.…”

Section: Adsorption Equilibrium Modellingmentioning

confidence: 95%

Cleaner Approach for Atrazine Removal Using Recycling Biowaste/Waste in Permeable Barriers

Lago¹,

Silva²,

Tavares³

2021

Recycling

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This work addresses the rehabilitation of water contaminated with atrazine, entrapping it in a permeable and sustainable barrier designed with waste materials (sepiolite) and with biomaterials (cork and pine bark). Atrazine adsorption was assessed by kinetics and equilibrium assays and desorption was tested with different extraction solvents. Adsorbed atrazine was 100% recovered from sepiolite using 20% acetonitrile solution, while 40% acetonitrile was needed to leach it from cork (98%) and pine bark (94%). Continuous fixed-bed experiments using those sorbents as PRB were performed to evaluate atrazine removal for up-scale applications. The modified dose-response model properly described the breakthrough data. The highest adsorption capacity was achieved by sepiolite (23.3 (±0.8) mg/g), followed by pine bark (14.8 (±0.6) mg/g) and cork (13.0 (±0.9) mg/g). Recyclability of sorbents was evaluated by adsorption-desorption cycles. After two regenerations, sepiolite achieved 81% of atrazine removal, followed by pine with 78% and cork with 54%. Sepiolite had the best performance in terms of adsorption capacity/stability. SEM and FTIR analyses confirmed no significant differences in material morphology and structure. This study demonstrates that recycling waste/biowaste is a sustainable option for wastewater treatment, with waste valorization and environmental protection.

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Experimental and modeling investigation of adsorption equilibrium of CH4, CO2, and N2 on activated carbon and prediction of multi-component adsorption equilibrium

Cited by 41 publications

References 46 publications

Measurements and calculations of the equilibrium adsorption amounts of CO2–N2, CO–N2, and CO2–CO mixed gases on 13X zeolite

Measurements and calculations of the equilibrium adsorption amounts of CO2–N2, CO–N2, and CO2–CO mixed gases on 13X zeolite

Adsorption Equilibrium, Thermodynamic, and Kinetic Study of O₂/N₂/CO₂ on Functionalized Granular Activated Carbon

Cleaner Approach for Atrazine Removal Using Recycling Biowaste/Waste in Permeable Barriers

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Experimental and modeling investigation of adsorption equilibrium of CH4, CO2, and N2 on activated carbon and prediction of multi-component adsorption equilibrium

Cited by 41 publications

References 46 publications

Measurements and calculations of the equilibrium adsorption amounts of CO2–N2, CO–N2, and CO2–CO mixed gases on 13X zeolite

Measurements and calculations of the equilibrium adsorption amounts of CO2–N2, CO–N2, and CO2–CO mixed gases on 13X zeolite

Adsorption Equilibrium, Thermodynamic, and Kinetic Study of O2/N2/CO2 on Functionalized Granular Activated Carbon

Cleaner Approach for Atrazine Removal Using Recycling Biowaste/Waste in Permeable Barriers

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Adsorption Equilibrium, Thermodynamic, and Kinetic Study of O₂/N₂/CO₂ on Functionalized Granular Activated Carbon