Adsorption of CO2 over MgO−Impregnated NaYzeolites and modeling study

Bekhti, H.; Bouchafaa, H.; Melouki, Redouane; Travert, Arnaud; Boucheffa, Y.

doi:10.1016/j.micromeso.2019.109866

Cited by 16 publications

(8 citation statements)

References 62 publications

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“…The use of the single-site Langmuir isotherm may look like a simplification because more complex models can better approximate the nonlinearity of CO 2 adsorption. For example, Bekhti et al [46] compared 8 adsorption isotherm models for CO 2 on NaY zeolite up to 1 bar, and although the dual-site and the multi-site Langmuir isotherms had the smallest error, the single-site Langmuir isotherm was considered sufficient. We wanted to start with a simple model, which turned out to be sufficient even for higher pressures, despite the recommendation of Hefti et al [43].…”

Section: Simulation Resultsmentioning

confidence: 99%

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

2022

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This paper focuses on the laboratory experiments of low-temperature adsorption of CO2 at elevated pressure and on the validation of our mathematical model with the data obtained. The numerical approach uses fitting of adsorption isotherm parameters and sensitivity analysis of parameters influencing the breakthrough curve shape and onset time. We first evaluate the results of breakthrough experiments for zeolite 13X. Then, we use the results obtained to design a dynamic mathematical model to predict the breakthrough curve profile. Experimental results show that zeolite 13X possesses high adsorption capacities (over 10 % of its weight at adsorption temperatures of 293 K and below), as expected. The mathematical simulation was accurate at predicting the breakthrough onset time; however, this prediction accuracy declined with the outlet CO2 concentration exceeding 75 %, which is discussed. The sensitivity analysis indicated that the choice of different estimates of mass transport and bed porosity, as well as the choice of numerical scheme, can lead to a more accurate prediction, but the same set of parameters is not suitable for all process conditions.

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Section: Simulation Resultsmentioning

confidence: 99%

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

2022

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“…3 Zeolite-based magnesia compounds are among the most popular adsorbents that, by 52 a synergistic effect, could overcome most problems triggered by the removal of 53 organic and inorganic pollutants in liquid or gaseous phases [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Zeolite-Supported Magnesia-magnetite Nanoparticles and Its Efficient Application in Ultrasound-Assisted Adsorption of Dairy Wastewater: Optimization and Modeling of Process by RSM and ANN

Mehrizad

2021

Preprint

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In the present study, the ternary magnesia-magnetite-zeolite composite was prepared via a facile method. The XRD patterns and EDX-elemental mapping analysis confirmed the formation of composite with components of MgO, Fe3O4, and zeolite. The FE-SEM and TEM images, along with BET-BJH results, corroborated the construction of the composite with appropriate morphology and mesoporous structure (SBET: 68.90 m2 g-1). The VSM analysis demonstrated the ferromagnetic property of the prepared composite (Ms: 8 emu g-1). The as-prepared ternary composite was used for the adsorption of dairy effluent by ultrasound-assisted approach. The optimization of the adsorption operational parameters, employing response surface methodology (RSM), led to a swift reduction in COD (83%). The modeling of the process by artificial neural network (ANN) showed that the adsorbent dosage was the most important factor with 38.30% impact on the COD extent. The adsorption of dairy wastewater by composite was consistent with Temkin isotherm model and the kinetics data were well described by both Ho’s pseudo 2nd order and Elovich models. This indicates that the process is attributed to chemical adsorption. The studies associated with thermodynamics revealed that this process was endothermic (ΔH°> 0) and spontaneous (ΔG°< 0). Accordingly, the MgO-Fe3O4-zeolite could be considered as a potential adsorbent in reducing the COD of dairy wastewater.

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“…Many literatures have reported MgO has good performance for acidic gas removal, thus MgO selected as the catalyst participate in the whole experiment. [20][21][22] In order to solve the problem that carbon after impregnation, this article studies a new way to add the catalyst by catalyst-integration technology, which combines the carbon with catalyst to coexist in carbon surface. Meanwhile the coal based 4 mm pellet carbon is selected as adsorbent for impregnation.…”

Section: Introductionmentioning

confidence: 99%

“…Until now, there are limited papers dealing with this topic that add the catalyst directly on the carbon during the activated carbon preparation process. Many literatures have reported MgO has good performance for acidic gas removal, thus MgO selected as the catalyst participate in the whole experiment 20–22 . In order to solve the problem that carbon after impregnation, this article studies a new way to add the catalyst by catalyst‐integration technology, which combines the carbon with catalyst to coexist in carbon surface.…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance improved by catalyst‐integration technology and boostingH₂Scatalytic adsorption

Liu

Zuo

2021

Environ Prog Sustainable Energy

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Herein, impregnation is a traditional and normal method to load catalyst on the activated carbon. A new way is reported to add the catalyst by catalyst‐integration, which combines the carbon with catalyst to coexist in carbon surface. The catalyst content of the carbon prepared by catalyst‐integration is 5.51%, and the same catalyst content carbon is also prepared by impregnation method. The differences between the two carbons are investigated. The carbon produced by catalyst‐integration has both strongly physical and chemical adsorption property, and catalyst has no effect on the physical adsorption. The catalyst‐integration carbon in comparing with impregnation carbon has larger H2S adsorption capacity no matter at oxygen and oxygen‐free conditions. The H2S breakthrough capacity of catalyst‐integration carbon reaches 0.13 g/cm3. Raw carbon after impregnation causes the decrease of pore volume and surface area. The carbon prepared by catalyst‐integration technology has no effects on the pore volume and reduce surface area. The influence of organic on the H2S adsorption and carbon fired after saturation are also investigated. The results show that catalyst‐integration carbon has better adsorption performance, and lower risk of spent carbon fire. In addition, the ignition temperature of the catalyst‐integration carbon reaches 507°C. Meanwhile, the related samples are characterized by Brunauer–Emmett–Teller, scanning electron microscopy and X‐ray diffraction.

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Adsorption of CO2 over MgO−Impregnated NaYzeolites and modeling study

Cited by 16 publications

References 62 publications

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

Synthesis of Zeolite-Supported Magnesia-magnetite Nanoparticles and Its Efficient Application in Ultrasound-Assisted Adsorption of Dairy Wastewater: Optimization and Modeling of Process by RSM and ANN

Catalytic performance improved by catalyst‐integration technology and boostingH₂Scatalytic adsorption

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Adsorption of CO2 over MgO−Impregnated NaYzeolites and modeling study

Cited by 16 publications

References 62 publications

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

Synthesis of Zeolite-Supported Magnesia-magnetite Nanoparticles and Its Efficient Application in Ultrasound-Assisted Adsorption of Dairy Wastewater: Optimization and Modeling of Process by RSM and ANN

Catalytic performance improved by catalyst‐integration technology and boostingH2Scatalytic adsorption

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Catalytic performance improved by catalyst‐integration technology and boostingH₂Scatalytic adsorption