scholarly journals Roles of London Dispersive and Polar Components of Nano-Metal-Coated Activated Carbons for Improving Carbon Dioxide Uptake

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 691
Author(s):  
Seul-Yi Lee ◽  
Jong-Hoon Lee ◽  
Yeong-Hun Kim ◽  
Kyong-Yop Rhee ◽  
Soo-Jin Park
Keyword(s):  
Co2 Capture ◽  
Co2 Adsorption ◽  
Activated Carbons ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Economic Benefits ◽  
Co2 Uptake ◽  
Carbon Dioxide Uptake ◽  
Polar Components ◽  
Adsorption Behaviors

Adsorption using carbonaceous materials has been considered as the prevailing technology for CO2 capture because it offers advantages such as high adsorption capacity, durability, and economic benefits. Activated carbon (AC) has been widely used as an adsorbent for CO2 capture. We investigated CO2 adsorption behaviors of magnesium oxide-coated AC (MgO-AC) as a function of MgO content. The microstructure and textural properties of MgO-AC were characterized by X-ray diffraction and nitrogen adsorption–desorption isotherms at 77 K, respectively. The CO2 adsorption behaviors of MgO-AC were evaluated at 298 K and 1 atm. Our experimental results revealed that the presence of MgO plays a key role in increasing the CO2 uptake through the interaction between an acidic adsorbate (e+) and an efficient basic adsorbent (e−).

scholarly journals Coal-Based Activated Carbons for the Removal of Sulphur Dioxide via Adsorption

1997 ◽  
Vol 15 (10) ◽  
pp. 803-814 ◽  
Author(s):  
A.M. Youssef ◽  
M.R. Mostafa ◽  
E.M. Dorgham
Keyword(s):  
Activated Carbon ◽  
Low Temperature ◽  
Zinc Chloride ◽  
Sulphur Dioxide ◽  
Activated Carbons ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Carbon Surface ◽  
Steam Activation ◽  
Pore Widening

Zinc chloride-activated carbons and steam-activated carbons were prepared from Maghara coal. The textural properties were determined from low-temperature nitrogen adsorption. Zinc chloride activation is usually associated with the creation of new micropores while steam activation involves pore widening particularly when the percentage burn-off is high. The adsorption of SO2 on steam-activated carbon is high compared with ZnCl2-activated carbons. Steam activation develops surface basic groups which provide chemisorption sites for SO2. The adsorption of SO2 is enhanced in the presence of O2 and water vapour and involves the formation of sulphuric acid in this case. Sulphur dioxide adsorption is related to the chemistry of the carbon surface rather than to the extent of the surface area of the activated carbon.

scholarly journals Synthesis and use of carvedilol metal complexes as carbon dioxide storage media

2020 ◽  
Vol 10 (3) ◽  
pp. 157-164
Author(s):  
Omar G. Mousa ◽  
Emad Yousif ◽  
Ahmed A. Ahmed ◽  
Gamal A. El‐Hiti ◽  
Mohammad Hayal Alotaibi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Metal Complexes ◽  
Copper Complexes ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Carbon Dioxide Storage ◽  
Small Surface ◽  
Carbon Dioxide Uptake ◽  
Storage Media ◽  
Adsorption Desorption

Abstract The consequences of increased fossil fuel consumption on the environment presents a challenge. Carbon dioxide capture is a useful technique to reduce global warming. Therefore, three carvedilol metal (nickel, cobalt, and copper) complexes were synthesized as potential carbon dioxide storage media. The structural and textural properties of metal carvedilol complexes have been established using various techniques. The metal complexes have mesoporous structures in which pore size was approximately 3 nm. Particle size ranged from 51.0 to 393.9 nm with a relatively small surface area (6.126–9.073 m2/g). The carvedilol metal complexes have either type-III or IV nitrogen adsorption–desorption isotherm. The complexes showed reasonable capacity towards carbon dioxide uptake (up to 18.21 cm3/g) under the optimized condition (40 bar and 323 K). Graphical Abstract

scholarly journals Equilibrium and Kinetics of CO2 Adsorption by Coconut Shell Activated Carbon Impregnated with Sodium Hydroxide

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 201
Author(s):  
Chaiyot Tangsathitkulchai ◽  
Suravit Naksusuk ◽  
Atichat Wongkoblap ◽  
Poomiwat Phadungbut ◽  
Prapassorn Borisut
Keyword(s):  
Activated Carbon ◽  
Sodium Hydroxide ◽  
Co2 Adsorption ◽  
Activated Carbons ◽  
Nitrogen Adsorption ◽  
Coconut Shell ◽  
Type I ◽  
Equilibrium And Kinetics ◽  
Coconut Shell Activated Carbon ◽  
Kinetics Of

The equilibrium and kinetics of CO2 adsorption at 273 K by coconut-shell activated carbon impregnated with sodium hydroxide (NaOH) was investigated. Based on nitrogen adsorption isotherms, porous properties of the tested activated carbons decreased with the increase of NaOH loading, with the decrease resulting primarily from the reduction of pore space available for nitrogen adsorption. Equilibrium isotherms of CO2 adsorption by activated carbons impregnated with NaOH at 273 K and the pressure up to 100 kPa displayed an initial part of Type I isotherm with most adsorption taking place in micropores in the range of 0.7–0.9 nm by pore-filling mechanisms. The amount of CO2 adsorbed increased with the increase of NaOH loading and passed through a maximum at the optimum NaOH loading of 180 mg/g. The CO2 isotherm data were best fitted with the three-parameter Sips equation, followed by Freundlich and Langmuir equations. The pore diffusion model, characterized by the effective pore diffusivity (De), could well describe the adsorption kinetics of CO2 in activated carbons impregnated with NaOH. The variation of De with the amount of CO2 adsorbed showed three consecutive regions, consisting of a rapid decrease of De for CO2 loading less than 40 mg/g, a relatively constant value of De for the CO2 loading of 40–80 mg/g and a slow decrease of De for the CO2 loading of 80–200 mg/g. The maximum De occurred at the optimum NaOH loading of 180 mg/g, in line with the equilibrium adsorption results. The values of De varied from 1.1 × 10−9 to 5.5 × 10−9 m2/s, which are about four orders of magnitude smaller than the molecular diffusion of CO2 in air. An empirical correlation was developed for predicting the effective pore diffusivity with the amount of CO2 adsorbed and NaOH loading.

scholarly journals Highly Selective CO2 Capture on Waste Polyurethane Foam-Based Activated Carbon

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 592 ◽  
Author(s):  
Chao Ge ◽  
Dandan Lian ◽  
Shaopeng Cui ◽  
Jie Gao ◽  
Jianjun Lu
Keyword(s):  
Activated Carbon ◽  
Polyurethane Foam ◽  
Co2 Capture ◽  
Carbon Materials ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Physical Activation ◽  
Activation Process ◽  
Co2 Uptake ◽  
High Co2

Low-cost activated carbons were prepared from waste polyurethane foam by physical activation with CO2 for the first time and chemical activation with Ca(OH)2, NaOH, or KOH. The activation conditions were optimized to produce microporous carbons with high CO2 adsorption capacity and CO2/N2 selectivity. The sample prepared by physical activation showed CO2/N2 selectivity of up to 24, much higher than that of chemical activation. This is mainly due to the narrower microporosity and the rich N content produced during the physical activation process. However, physical activation samples showed inferior textural properties compared to chemical activation samples and led to a lower CO2 uptake of 3.37 mmol·g−1 at 273 K. Porous carbons obtained by chemical activation showed a high CO2 uptake of 5.85 mmol·g−1 at 273 K, comparable to the optimum activated carbon materials prepared from other wastes. This is mainly attributed to large volumes of ultra-micropores (<1 nm) up to 0.212 cm3·g−1 and a high surface area of 1360 m2·g−1. Furthermore, in consideration of the presence of fewer contaminants, lower weight losses of physical activation samples, and the excellent recyclability of both physical- and chemical-activated samples, the waste polyurethane foam-based carbon materials exhibited potential application prospects in CO2 capture.

scholarly journals CO2 Adsorption of Materials Synthesized from Clay Minerals: A Review

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 514 ◽  
Author(s):  
Nesrine Chouikhi ◽  
Juan Antonio Cecilia ◽  
Enrique Vilarrasa-García ◽  
Sabrine Besghaier ◽  
Mohamed Chlendi ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Clay Minerals ◽  
Co2 Adsorption ◽  
Textural Properties ◽  
Operating Conditions ◽  
Co2 Uptake ◽  
Number Of Factors ◽  
Branched Polyethylenimine ◽  
Co2 Adsorption Capacity ◽  
Adsorption Of Co2

The aim of this work is to make a brief review of the adsorption of CO2 on modified clay minerals. Previous researchers have used different clay modifications, either by making changes in the structure by a reaction with another product or by the addition of a catalyst to improve their CO2 adsorption capacity. In order to obtain high values of CO2 uptake, some researchers have been incorporated amines-speices such as (3-aminopropyl)triethoxysilane (APTES), tetraethylenepentamine (TEPA) and a branched polyethylenimine (PEI) by grafting or impregnation. The synthesis of an adsorbent from mineral clays can generate an increase in its porosity and in its textural properties. These investigations differ in a number of factors such as the kind of clay, the operating conditions, y and the nature of the impregnated compound. The role of these factors in the CO2 adsorption capacity will be considered in detail in this review.

Post-combustion CO2 adsorption on activated carbons with different textural properties

2015 ◽  
Vol 209 ◽  
pp. 157-164 ◽  
Author(s):  
Fabio Montagnaro ◽  
Ana Silvestre-Albero ◽  
Joaquín Silvestre-Albero ◽  
Francisco Rodríguez-Reinoso ◽  
Alessandro Erto ◽  
...  
Keyword(s):  
Co2 Adsorption ◽  
Activated Carbons ◽  
Textural Properties

Kinetics of CO2 Adsorption on Microwave Palm Shell Activated Carbon

2014 ◽  
Vol 1043 ◽  
pp. 224-228 ◽  
Author(s):  
Noor Shawal Nasri ◽  
Usman Dadum Hamza ◽  
Nor Aishah Saidina Amin ◽  
Jibril Mohammed ◽  
Murtala Musa Ahmed ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Co2 Adsorption ◽  
Activated Carbons ◽  
Diffusion Mechanism ◽  
Co2 Uptake ◽  
Intraparticle Diffusion Model ◽  
Palm Shell ◽  
Model Pore ◽  
Pseudosecond Order ◽  
Kinetics Of

Activated carbon was prepared from palm shell by pyrolysis followed by K2CO3 assisted microwave heating. Effects of temperature on adsorption capability and kinetics of the sorbent towards CO2 adsorption was also studied. The results indicated that, the amount CO2 adsorbed decrease as the adsorption temperature increases. The kinetic data were obtained using a static volumetric method at 303.15, 343.15, 378.15, and 443.15 K and at pressures up to 4 bar. The kinetics of CO2 adsorption on the activated carbons was examined using the pseudofirst-order equation and pseudosecond-order equations. Weber and Morris intraparticle diffusion model was applied to examine the mechanism of the adsorption system. Lowest CO2 uptake recorded was 0.3 mmol/g at 443.15 K and 0.5 bar while the highest was 7.45mmol/g obtained at 303.15 K and 4 bar. The kinetics followed pseudosecond-order model. Pore diffusion is not the sole rate diffusion mechanism.

scholarly journals Metal-Free Modified Boron Nitride for Enhanced CO2 Capture

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 549
Author(s):  
Fereshteh Hojatisaeidi ◽  
Mauro Mureddu ◽  
Federica Dessì ◽  
Geraldine Durand ◽  
Basudeb Saha
Keyword(s):  
Boron Nitride ◽  
Co2 Capture ◽  
Co2 Adsorption ◽  
High Surface ◽  
High Surface Area ◽  
Textural Properties ◽  
Structure Directing Agent ◽  
Metal Free ◽  
Solid Adsorbent ◽  
Triblock Copolymer Surfactant

Porous boron nitride is a new class of solid adsorbent with applications in CO2 capture. In order to further enhance the adsorption capacities of materials, new strategies such as porosity tuning, element doping and surface modification have been taken into account. In this work, metal-free modification of porous boron nitride (BN) has been prepared by a structure directing agent via simple heat treatment under N2 flow. We have demonstrated that textural properties of BN play a pivotal role in CO2 adsorption behavior. Therefore, addition of a triblock copolymer surfactant (P123) has been adopted to improve the pore ordering and textural properties of porous BN and its influence on the morphological and structural properties of pristine BN has been characterized. The obtained BN-P123 exhibits a high surface area of 476 m2/g, a large pore volume of 0.83 cm3/g with an abundance of micropores. More importantly, after modification with P123 copolymer, the capacity of pure CO2 on porous BN has improved by about 34.5% compared to pristine BN (2.69 mmol/g for BN-P123 vs. 2.00 mmol/g for pristine BN under ambient condition). The unique characteristics of boron nitride opens up new routes for designing porous BN, which could be employed for optimizing CO2 adsorption.

scholarly journals Improving the Carbon Dioxide Uptake Efficiency of activated Carbons Using a Secondary Activation With Potassium Hydroxide

2018 ◽  
Vol 20 (3) ◽  
pp. 87-94
Author(s):  
Michal Zgrzebnicki ◽  
Ewa Michalczyszyn ◽  
Rafal J. Wrobel
Keyword(s):  
Carbon Dioxide ◽  
Potassium Hydroxide ◽  
Activated Carbons ◽  
Potassium Ions ◽  
Co2 Uptake ◽  
Mesopore Volume ◽  
Volume Increase ◽  
Carbon Dioxide Uptake ◽  
Co2 Sorption ◽  
Secondary Activation

Abstract Secondary activation of commercial activated carbon (AC) ORGANOSORB 10-CO was carried out at 600, 700 and 800oC with mass ratios of potassium to AC (K/AC) in range 1-3. Crucial samples have shown following CO2 uptakes and SSA - 3.90 mmol/g and 1225 m2/g, 4.54 mmol/g and 1546 m2/g, 4.28 and 1717 m2/g for pristine material and samples obtained at 700oC with K/AC = 2 and at 800oC with K/AC = 3 respectively. Last sample also indicated signifi cant mesopore volume increase in diameter range 2-5 nm, from 0.11 to 0.24 cm3/g. CO2 uptake increase was explained by formation of micropores up to diameter of 0.8 nm, which distribution was established from CO2 sorption using DFT. Surface chemistry of all samples has not changed during modifi cation, what was proven by XPS. Moreover, deeper incorporation of potassium ions into graphite at higher temperatures was observed as confi rmed with EDS, XPS and XRD.

Biochar From Cocoa Shell Pyrolysis: Potential Sorbent for CO2 Capture

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Hamed Abedini Najafabadi ◽  
Nesrin Ozalp ◽  
Richard A. Davis
Keyword(s):  
Activated Carbon ◽  
Co2 Capture ◽  
Co2 Adsorption ◽  
Lignin Content ◽  
Co2 Uptake ◽  
Rate Limiting Step ◽  
Pseudo Second Order ◽  
Cocoa Shell ◽  
The Stability ◽  
Adsorption Desorption

Abstract Biochar produced from slow pyrolysis of cocoa shells was studied as a sorbent for CO2 capture. Three cocoa shell samples obtained from Papua New Guinea, Peru, and Colombia were studied. Thermogravimetric analysis showed that the first three stages of degradation were quite similar for different cocoa shell sources. However, the fourth stage was different, which could be due to the different lignin content in the cocoa shell sources. Chemical analysis showed that the cocoa shell biochar had a lower content of carbon and oxygen, and a higher content of magnesium, potassium, and calcium compared with the cocoa shell. CO2 uptake performance of the cocoa shell biochar was examined and compared with a commercial activated carbon using a thermogravimeter at atmospheric pressure and ambient temperature. The final CO2 uptake after 30 min was slightly higher for cocoa shell biochar. However, activated carbon had a faster adsorption response, and it approached equilibrium faster than the cocoa shell biochar. This could be due to differences in particle size, pore structure, and surface area of the activated carbon which allows the CO2 to be adsorbed easily in its porous structure. A pseudo-second-order model of kinetics fits the CO2 adsorption behavior of cocoa shell biochar and activated carbon indicating that the rate-limiting step is chemical adsorption. Furthermore, the stability of the cocoa shell sorbent was confirmed over four adsorption/desorption cycles. By considering the simplicity of the production process and efficiency of CO2 adsorption, cocoa shell biochar can be considered a good option for CO2 capture.

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