Adsorption kinetics and thermodynamics properties of Supercritical CO2 on activated clay

Jedli, Hedi; Brahmi, Jihed; Hedfi, Hachem; Mbarek, Mohamed; Bouzgarrou, Souhail; Slimi, Khalifa

doi:10.1016/j.petrol.2018.03.064

Cited by 28 publications

(17 citation statements)

References 13 publications

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“…Crude natural gas is mainly composed of methane presenting impurities (CO 2 , H 2 O, H 2 S, etc) that must be removed to ensure process and transport specifications (Kang et al., 2017; Rufford et al., 2012; Song et al., 2017). Carbon dioxide is considered the main greenhouse gas (Jedli et al., 2018). Nowadays CO 2 concentration in atmosphere has increased by 40% when compared to pre-industrial era (IPCC, 2014; Mizuta et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Supported ionic liquids as highly efficient and low-cost material for CO2/CH4 separation process

Polesso

Bernard

Ferrari

et al. 2019

Heliyon

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Physical immobilization of ionic liquids (ILs) in solid materials appears as an interesting strategy for the development of new sorbents for CO 2 separation from natural gas. In this work the effect of physical immobilization of two ionic liquids with different anions (bmim[Cl] and bmim[OAc]) on two mesoporous supports (commercial silica SBA-15 and silica extracted from rice husk) was evaluated for CO 2 separation from natural gas by experimental determination of CO 2 sorption, CO 2 /CH 4 selectivity and sorption kinetics. Results showed that the pure supports present the greatest CO 2 sorption capacity when compared to immobilized ILs. However, CO 2 removal efficiency improves considerably in the CO 2 /CH 4 mixture when ILs are immobilized in these supports. The best selectivity results were obtained for supports immobilized with the IL bmim[Cl] and values increased for SIL-Cl by 37% and SBA-Cl 51% when compared with their respective supports. The contribution of SIL-Cl (3.03 ± 0.12) to separation performance (CO 2 /CH 4 ) is similar to SBA-Cl (3.29 ± 0.39). ILs supported also presented fast sorption kinetics when compared to pure ILs thus being an interesting alternative in the search for highly efficient and low-cost separation processes.

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Section: Introductionmentioning

confidence: 99%

Supported ionic liquids as highly efficient and low-cost material for CO2/CH4 separation process

Polesso

Bernard

Ferrari

et al. 2019

Heliyon

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“…Indeed, the treatment with minerals acids significantly changed their textural characteristics. This can expand their applications to include environmental protection [14,15], catalytic cracking of petroleum [16], catalyst supports in many chemical processes and detergent in paper industries and textile fabrications [17][18][19]. In fact, the most applications of these clays are bleaching, purification and stabilization of vegetable oils.…”

Section: Introductionmentioning

confidence: 99%

“…Four parameters are known to strongly influence the structural properties and can affect significantly the required results: the temperature, the contact time, the solid-to-liquid ratio and mass percentage of acid. These parameters are the main factors that delimit the extent of acid-activation and thus, the induced physicochemical and structural changes [13][14][15]. As a consequence of these structural changes, acid-treatment can extend the fields of application of these porous solids such as in the control of atmospheric pollution [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Structure and Chemical Activation on the Adsorption Properties of Green Clay Minerals for the Removal of Cationic Dye

et al. 2018

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In this study, natural clay minerals with green appearance were treated with sulfuric acid. Mass percentage of acid (wt%), temperature (T), contact time (t) and liquid-to-solid mass ratio (R) are used as the prevailing factors that determine the extent of acid-activation. The values of these factors range from 15–50%, 60–90 °C, 1.5–6 h and 4–7, respectively. The study has focused on the structural changes as well as textural characteristics of the clay. Three activated clay samples were prepared under different treatment conditions. The samples were characterized using X-ray powder diffraction (XRD), fourier transform infrared (FTIR), scanning electron microscope (SEM), chemical analysis and N2 adsorption techniques. Characterization of the treated clay minerals exhibited significant structural changes to a greater extent of acid-activation, from being partially crystalline to being amorphous silica. The surface area and total pore volume of clay increased proportionally with the level of acid treatment. The average pore diameter behaved differently. During the strong acid treatment, a large increase in pore volume and the enlargement of the pore size distribution were observed. This suggests that considerable structural changes and partial destruction may have occurred in this condition. The removal of methylene blue, used as cationic dye, from aqueous solution by the batch adsorption technique on three prepared acid-activated clay samples was studied. The Langmuir model was found to agree well with the experimental data.

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“…Global warming caused by greenhouse gases is leading to the destabilization of marine ecosystems, the rise in sea levels, and the acidification of the oceans [1]. CO 2 is the main contributor to these phenomena due to industrialization processes [2]. During the last several decades, CO 2 concentration has increased considerably [3] due to the combustion of fossil fuels [4] and other human activities, such as the cement industry [5].…”

Section: Introductionmentioning

confidence: 99%

“…About 60% of the effects of global warming are due to CO 2 , even though methane and chlorofluorocarbons have a much greater greenhouse effect in relation to the mass of the gases. CO 2 emission has increased in recent years [2], and the international panel on climate change (IPCC) stated that the average concentration of CO 2 could rise to 570 ppm by 2100, causing a 1.9 • C increase in the average global temperature and a 38 cm increase in sea level [8]. For this reason, CO 2 has become a threat to the environment [2].…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Equilibrium Study of the Adsorption of CO2 in Ultramicropores of Resorcinol-Formaldehyde Aerogels Obtained in Acidic and Basic Medium

Romero

Moreno–Piraján

Gutiérrez

2018

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In this work, aerogels were prepared using resorcinol-formaldehyde as a precursor in two synthetic routes, one basic and one acidic, to perform the adsorption of CO 2 at 0 • C and atmospheric pressure. Aerogels were Characterization by N 2 and CO 2 Physisorption, Raman Spectroscopy, Scanning Electron Microscopy, and Infrared Spectroscopy. In general, was found that aerogels have a polymeric, disordered, three-dimensional structure and have a microporous surface. Langmuir, Freundlich, Sips and Toth equilibrium models present a good data fit of CO 2 adsorption at relative pressure ranging between 1 × 10 −4 and 3 × 10 −2 . The diffusion intra-particle kinetic model explains the setps of this process; the Elovich model also showed a good fit, therefore, there are an energetic heterogeneity of the CO 2 superficial adsorption sites. The aerogel carbonized in basic medium at 1050 • C (ACB 1050) material was the best adsorbent of this pollutant, reaching an adsorption capacity of 6.43 mmol g −1 .Achieving economic and favorable separation of CO 2 from gas mixtures represents one of the main technological and environmental problems facing our society today [10]. The most studied post-combustion technology is chemical adsorption. Monoethanol amine (MEA) has been the chemical most used for this purpose. Alternative solvents, such as piperazine and ammonia, have also been proposed to achieve this objective [6]. The advantage of this method is the low partial pressure that is used because the CO 2 molecules are easily absorbed over liquids in flue gas streams [11]. The disadvantage is that the use of amine alkoxysilanes is very expensive [12], and the method requires high regeneration energy due to the large emission of combustion gases and the costs of repairing the process equipment [4]. Other common methods to achieve CO 2 sequestration include separation in membranes, cryogenic and biological methods, and physical adsorption [13].Capture and storage technology has been considered the best option to reduce carbon dioxide emissions from large sources, and particularly adsorption is considered a promising process to separate gas mixtures [14]. This process is inexpensive, requires less regeneration energy, is easy to handle, has fast kinetics, and has a high capacity of CO 2 adsorption and selectivity [4]. The adsorbents provide a high surface area, which is a fundamental parameter in this process. Among the different adsorbents, 13X zeolite has been investigated to adsorb CO 2 by oscillating the pressure [6]. It is generally recognized that CO 2 is physically adsorbed to activated carbon, mainly by condensation or liquefaction in pores with widths that are less than 1 nm [15]. The adsorption of this greenhouse gas in nanopore materials has also been investigated in zeolites exchanged with alkali metals, amino-modified and modified alkaline, mesoporous silicas, microporous polymers, carbons, and metalorganic structures [10]. It has also been established that the chemical properties of activated carbon play a relevant role in...

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Adsorption kinetics and thermodynamics properties of Supercritical CO2 on activated clay

Cited by 28 publications

References 13 publications

Supported ionic liquids as highly efficient and low-cost material for CO2/CH4 separation process

Supported ionic liquids as highly efficient and low-cost material for CO2/CH4 separation process

Effect of Structure and Chemical Activation on the Adsorption Properties of Green Clay Minerals for the Removal of Cationic Dye

Kinetic and Equilibrium Study of the Adsorption of CO2 in Ultramicropores of Resorcinol-Formaldehyde Aerogels Obtained in Acidic and Basic Medium

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