Modelling of NO adsorption in fixed bed on activated carbon

Kuboňová, Lenka; Obalová, Lucie; Vlach, Oldřich; Troppová, Ivana; Kalousek, Jaroslav

doi:10.2478/v10176-011-0029-z

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…It also notices that the adsorption process occurs in the beginning quickly and be a decline in the curves and clear because of the abundance of the active sites and the presence of small surface resistance on the surface of adsorbents, then more smoothness gradually less steep and alignment over time because of the fullness of all the active sites on the surface of adsorbents and that the process has become controlled by internal diffusion within the adsorbents in accordance with what has been presented previously [39]. Also the results of comparison for both that the amount of the CO 2 adsorbed onto AC increases due to increase of the concentration difference of CO 2 between bulk and surface of AC leading to an increase of mass transfer [9,40].…”

Section: Dynamic Studiessupporting

confidence: 86%

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Experimental Study of Adsorption on Activated Carbon for CO₂Capture

Ibrahim¹,

Al-Meshragi²

2020

CO2 Sequestration

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The adsorption of carbon dioxide (CO) on activated carbon (AC) prepared from olive trees has been investigated by using a fixed bed adsorption apparatus. The adsorption equilibrium and breakthrough curves were determined at different temperatures 30, 50, 70, and 90°C in order to investigate both kinetic and thermodynamic parameters. Maximum CO 2 sorption capacity on AC ranged from 109.5 to 35.46 and from 129.65 to 35.55 mg CO 2 /g of AC for initial concentrations 10 and 13.725% vol., respectively. Different isotherm models are applied to mathematically model the CO 2 adsorption, and on the basis of the estimated adsorption capacity by model and determination coefficient (r 2), the Langmuir model provides a perfect fit to the experimental data owing to closeness of the r 2 to unity. From the correlation coefficient, it is found that the pseudo-second-order model is well-fitted with the experimental data. In addition, it indicates that CO 2 adsorption is a physical adsorption process and demonstrates a behavior of an exothermic reaction, which is consistent with the thermodynamic analysis. The results obtained in this study conclude that AC prepared from olive trees can be considered as adequate for designing a fixed bed cycle to separate carbon dioxide from flue gases and serve as a benchmark while searching for inexpensive and superior activated carbon production in future studies.

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Section: Dynamic Studiessupporting

confidence: 86%

“…The total pore volume and surface area of AC were determined using Gemini VII 2390a analyzer. The particle size is obtained by using standard mesh sieves (standard sieve AS 200), and average value of bed porosity is calculated in terms of the average diameter of particles [9].…”

Section: Preparation Of Activated Carbonmentioning

confidence: 99%

Experimental Study of Adsorption on Activated Carbon for CO₂Capture

Ibrahim¹,

Al-Meshragi²

2020

CO2 Sequestration

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“…The adsorption capacity increased as the increased CO 2 concentration, which was attributed to the high driving force of the CO 2 concentration between the bulk phase and the surface of AC that can promote a high mass transfer rate 73 , 74 . For all the explored ACs, the Freundlich model provided a better fit with the experimental results over the entire range of CO 2 concentrations than the Langmuir model, considered in terms of the higher R 2 and S values.…”

Section: Resultsmentioning

confidence: 99%

Valorization of spent disposable wooden chopstick as the CO2 adsorbent for a CO2/H2 mixed gas purification

Koo‐Amornpattana

Jonglertjunya

Phadungbut

et al. 2022

Sci Rep

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A series of activated carbons (ACs) derived from spent disposable wooden chopsticks was prepared via steam activation and used to separate carbon dioxide (CO2) from a CO2/hydrogen (H2) mixed gas at atmospheric pressure. A factorial design was employed to investigate the effects of the activation temperature and time as well as their interactions on the production yield of ACs and their CO2 adsorption capacity. The activation temperature exhibited a much higher impact on both the production yield and the CO2 adsorption capacity of ACs than the activation time. The interaction of both parameters did not significantly affect the yield of ACs, but did affect the CO2 adsorption capacity. The optimal preparation condition provided ACs with a desirable yield of around 23.18% and a CO2 adsorption capacity of 85.19 mg/g at 25 °C and 1 atm and consumed the total energy of 225.28 MJ/kg AC or 116.4 MJ/g-mol CO2. A H2 purity of greater than 96.8 mol% was achieved from a mixed gas with low CO2 concentration (< 20 mol%) during the first 3 min of adsorption and likewise around 90 mol% from a mixed gas with a high CO2 concentration (> 30 mol%) during the first 2 min. The CO2 adsorption on the as-prepared ACs proceeded dominantly via multilayer physical adsorption and was affected by both the surface area and micropore volume of the ACs. The adsorption capacity was diminished by around 18% after six adsorption/desorption cycles. The regeneration of the as-prepared chopstick-derived ACs can be easily performed via heating at a low temperature and ambient pressure, suggesting their potential application in the temperature swing adsorption process.

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“…This is probably because a high concentration of (Au 2 S 2 O 3 )(SO 3 ) 2 5− in the bulk liquid can initiate a high concentration gradient between the bulk phase and the surface of TiO 2 , resulting in an increased mass transfer as well as an increased adsorption capacity. 30,31 In the presence of light, increasing the concentration of mixed complexing agents slightly decreased the photocatalytic efficiency for Au recovery compared with that in the absence of complexing agents, probably attributed to the shielding behavior of densely surrounded species in the presence of a high concentration of complexing agents. Based on the obtained results, among all employed commercial semiconductors, TiO 2 exhibited the highest photocatalytic recovery of Au from the simulated spent non-cyanide plating bath both in the absence and presence of complexing agents at all explored concentrations.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Recovery of Gold from a Non-Cyanide Gold Plating Solution as Au Nanoparticle-Decorated Semiconductors

et al. 2022

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In this work, a photocatalytic process was carried out to recover gold (Au) from the simulated non-cyanide plating bath solution. Effects of semiconductor types (TiO 2 , WO 3 , Nb 2 O 3 , CeO 2 , and Bi 2 O 3 ), initial pH of the solution (3−10), and type of complexing agents (Na 2 S 2 O 3 and Na 2 SO 3 ) and their concentrations (1−4 mM each) on Au recovery were explored. Among all employed semiconductors, TiO 2 exhibited the highest photocatalytic activity to recover Au from the simulated spent plating bath solution both in the absence and presence of complexing agents, in which Au was completely recovered within 15 min at a pH of 6.5. The presence of complexing agents remarkably affected the size of deposited Au on the TiO 2 surface, the localized surface plasmon effect (LSPR) behavior, and the valence band (VB) edge position of the obtained Au/TiO 2 , without a significant change in the textural properties or the band gap energy. The photocatalytic activity of the obtained Au/TiO 2 tested via two photocatalytic processes depended on the common reduction mechanism rather than the textural or optical properties. As a result, the Au/TiO 2 NPs obtained from the proposed recovery process are recommended for use as a photocatalyst for the reactions occurring at the conduction band rather than at the valence band. Notably, they exhibited good stability after the fifth photocatalytic cycle for Au recovery from the actual cyanide plating bath solution.

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Modelling of NO adsorption in fixed bed on activated carbon

Cited by 10 publications

References 15 publications

Experimental Study of Adsorption on Activated Carbon for CO₂Capture

Experimental Study of Adsorption on Activated Carbon for CO₂Capture

Valorization of spent disposable wooden chopstick as the CO2 adsorbent for a CO2/H2 mixed gas purification

Photocatalytic Recovery of Gold from a Non-Cyanide Gold Plating Solution as Au Nanoparticle-Decorated Semiconductors

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Modelling of NO adsorption in fixed bed on activated carbon

Cited by 10 publications

References 15 publications

Experimental Study of Adsorption on Activated Carbon for CO2Capture

Experimental Study of Adsorption on Activated Carbon for CO2Capture

Valorization of spent disposable wooden chopstick as the CO2 adsorbent for a CO2/H2 mixed gas purification

Photocatalytic Recovery of Gold from a Non-Cyanide Gold Plating Solution as Au Nanoparticle-Decorated Semiconductors

Contact Info

Product

Resources

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Experimental Study of Adsorption on Activated Carbon for CO₂Capture

Experimental Study of Adsorption on Activated Carbon for CO₂Capture