scholarly journals Sepiolite-based adsorbents for carbon dioxide capture

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Alicja Szymańska ◽  
Karolina Kiełbasa
Keyword(s):  
Carbon Dioxide ◽  
Pore Volume ◽  
Surface Characterization ◽  
Total Pore Volume ◽  
Dft Method ◽  
Koh Activation ◽  
Carbon Dioxide Adsorption ◽  
Adsorption Desorption ◽  
Bet Equation

Abstract Sepiolite and the sepiolite-based materials were studied in terms of carbon dioxide adsorption. The pore structure and the surface characterization of the obtained materials were specified based on adsorption-desorption isotherms of nitrogen measured at –196oC and carbon dioxide at 0oC. The specific surface area (SSA) was calculated according to the BET equation. The pore volume was estimated using the DFT method. Pristine sepiolite has shown the following value of SSA and CO2 uptake at 0oC – 105 m2/g and 0.27 mmol/g, respectively. The highest value of these parameters was found for material obtained by KOH activation of mixture sepiolite and molasses (MSEP2) – 676 m2/g and 1.49 mmol/g. Sample MSEP2 also indicated the highest value of total pore volume and micropores volume with a diameter up to 0.8 nm.

scholarly journals Activated carbons from common nettle as potential adsorbents for CO2 capture

2019 ◽  
Vol 21 (1) ◽  
pp. 59-66
Author(s):  
Alicja Szymańska ◽  
Amelia Skoczek ◽  
Jacek Przepiórski
Keyword(s):  
Carbon Dioxide ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Surface Characterization ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Dft Method ◽  
Nitrogen Atmosphere ◽  
Adsorption Desorption

Abstract Activated carbons (ACs) prepared from common nettle (Urtica Dioica L.) were studied in terms of carbon dioxide adsorption. ACs were prepared by KOH chemical activation in a nitrogen atmosphere at temperatures (ranging from 500 to 850°C). The pore structure and the surface characterization of the ACs were specified based on adsorption-desorption isotherms of nitrogen measured at –196°C and carbon dioxide at 0°C. The specific surface area was calculated according to the BET equation. The pore volume was estimated using the DFT method. The highest values of the specific surface area (SSA) showed activated carbons produced at higher carbonization temperatures. All samples revealed presence of micropores and mesopores with a diameter range of 0.3–10 nm. The highest value of the CO2 adsorption, 4.22 mmol/g, was found for the material activated at 700°C.

Preparation and Characterization of Electrospun Carbon Nanofibers with Na2CO3/H3PO4 Activation

2008 ◽  
Vol 135 ◽  
pp. 81-84 ◽  
Author(s):  
Ji Sun Im ◽  
Soo Jin Park ◽  
Young Seak Lee
Keyword(s):  
Phosphoric Acid ◽  
Specific Surface ◽  
Surface Area ◽  
Carbon Nanofibers ◽  
Pore Volume ◽  
Total Pore Volume ◽  
Chemical Agent ◽  
Electrospinning Method ◽  
Increase Surface Area

In this work, carbon nanofibers(CNFs) were prepared by using electrospinning method. Phosphoric acid and sodium carbonate activation of CNFs were conducted to increase surface area and pore volume. Pore structures of activated CNFs were developed with increasing surface area and pore volume through activation. Specific surface area increased about 60 times and total pore volume developed around 120 times. Activated CNFs have different pore distribution with different chemical agent.

scholarly journals Carbon Dioxide Adsorption on Porous and Functionalized Activated Carbon Fibers

2019 ◽  
Vol 9 (10) ◽  
pp. 1977 ◽  
Author(s):  
Yu-Chun Chiang ◽  
Cheng-Yu Yeh ◽  
Chih-Hsien Weng
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
Pore Volume ◽  
Co2 Adsorption ◽  
Physical Adsorption ◽  
Koh Activation ◽  
Co2 Uptake ◽  
Activated Carbon Fibers

Polyacrylonitrile-based activated carbon fibers (ACFs), modified using potassium hydroxide (KOH) or tetraethylenepentamine (TEPA), were investigated for carbon dioxide (CO2) adsorption, which is one of the promising alleviation approaches for global warming. The CO2 adsorption isotherms were measured, and the values of isosteric heat of adsorption were calculated. The results showed that the KOH-modified ACFs exhibited a great deal of pore volume, and a specific surface area of 1565 m2/g was obtained. KOH activation made nitrogen atoms easily able to escape from the surface of ACFs. On the other hand, the surface area and pore volume of ACFs modified with TEPA were significantly reduced, which can be attributed to the closing or blocking of micropores by the N-groups. The CO2 adsorption on the ACF samples was via exothermic reactions and was a type of physical adsorption, where the CO2 adsorption occurred on heterogeneous surfaces. The CO2 uptakes at 1 atm and 25 °C on KOH-activated ACFs reached 2.74 mmole/g. This study observed that microporosity and surface oxygen functionalities were highly associated with the CO2 uptake, implying the existence of O-C coordination, accompanied with physical adsorption. Well cyclability of the adsorbents for CO2 adsorption was observed, with a performance decay of less than 5% over up to ten adsorption-desorption cycles.

scholarly journals Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity

2016 ◽  
Vol 4 (38) ◽  
pp. 14739-14751 ◽  
Author(s):  
Saunab Ghosh ◽  
Marta Sevilla ◽  
Antonio B. Fuertes ◽  
Enrico Andreoli ◽  
Jason Ho ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Pore Volume ◽  
Carbon Materials ◽  
Total Pore Volume ◽  
Uptake Capacity ◽  
Heteroatom Doping ◽  
Carbon Dioxide Uptake ◽  
Performance Map ◽  
Methane Selectivity

The relative influence of heteroatom doping, surface area, and total pore volume of highly microporous carbon materials on CO2 uptake capacity, and the CO2/CH4 selectivity, at high pressure (≤30 bar) is presented.

scholarly journals Preparation of Active Carbon by Additional Activation with Potassium Hydroxide and Characterization of Their Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Bronislaw Buczek
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
High Pressure ◽  
Active Carbon ◽  
Potassium Hydroxide ◽  
Pressure Swing Adsorption ◽  
Total Pore Volume ◽  
Micropore Volume ◽  
Pressure Swing

A commercially available activated carbon was used to prepare active carbonviareactivation with KOH at 750°C. Active carbon was obtained with 60.5% yield. The resulting active carbon showed a well-developed porous structure with specific surface area 2939 m2/g, total pore volume 1.488 cm3/g, and micropore volume 1.001 cm3/g. Process reactivation of carbon changes its particle size as well as density properties and increases by nearly twice the amounts of methane and carbon dioxide adsorbed under high pressure conditions. Such active carbon may be used to enrich methane or carbon dioxide by pressure swing adsorption technique. Other possible applications of reactivated carbon are storage of hydrogen and methane and sequestration of carbon dioxide.

scholarly journals Characterization of Metal-Impregnated Charcoal: Nitrogen Adsorption

1995 ◽  
Vol 12 (2) ◽  
pp. 101-107 ◽  
Author(s):  
Riaz Qadeer ◽  
Javed Hanif ◽  
Abdul Majeed
Keyword(s):  
Surface Area ◽  
Pore Volume ◽  
Continuous Flow ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
Ionic Radii ◽  
Sorption System ◽  
Metal Impregnation ◽  
Continuous Flow Method

Nitrogen adsorption on metal (Ni, Cu, Zn) impregnated charcoal has been carried out at 77 K by the continuous flow method using a Quantasorb sorption system. It was observed that such metal impregnation did not contribute any extra surface area to the charcoal. The values of the surface area, micropore and total pore volumes determined from nitrogen adsorption follow the sequence Ni–charcoal < Cu–charcoal < Zn–charcoal < charcoal. Their behaviour is discussed in terms of the ionic radii of the metal ions concerned. The pore size distribution curves demonstrate the microporous nature of the charcoal, with the micropores contributing significantly to the total pore volume.

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