Carbon Spheres as CO2 Sorbents

Abstract

Microporous nanocarbon spheres were prepared by using a microwave assisted solvothermal method. To improve the carbon dioxide adsorption properties, potassium oxalate monohydrate and ethylene diamine (EDA) were employed, and the influence of carbonization temperature on adsorption properties was investigated. For nanocarbon spheres containing not only activator, but also EDA, an increase in the carbonization temperature from 600 °C to 800 °C resulted in an increase of the specific surface area of nearly 300% (from 439 to 1614 m2/g) and an increase of the CO2 adsorption at 0 °C and 1 bar (from 3.51 to 6.21 mmol/g).

Porous Aromatic Melamine Schiff Bases as Highly Efficient Media for Carbon Dioxide Storage

“…In contrast, porous nanocarbons with a high surface area (1114 m 2 /g) in the presence of potassium oxalate and ethylenediamine provided a CO 2 uptake as 4.60 mmol/g at a similar temperature and pressure [30]. Porous nanocarbons with a small surface area (439 m 2 /g) provided a low CO 2 uptake (1.94 mmol/g [30]. Ionic liquids in a silica matrix led to materials having a very small surface area (1-9 m 2 /g) and relatively poor sorption capacity towards CO 2 as 0.35 g of CO 2 per g of adsorbent [27].…”

“…Polyacrylonitrile carbon fibers in the presence of a base provided a CO 2 uptake of 2.74 mmol/g at room temperature and normal pressure [31]. In contrast, porous nanocarbons with a high surface area (1114 m 2 /g) in the presence of potassium oxalate and ethylenediamine provided a CO 2 uptake as 4.60 mmol/g at a similar temperature and pressure [30]. Porous nanocarbons with a small surface area (439 m 2 /g) provided a low CO 2 uptake (1.94 mmol/g [30].…”

“…The adsorption capacity of calcium oxide is limited but sufficiently high to facilitate its use as an effective medium for CO 2 capture. Several other materials such as ionic liquids in a solid matrix [27], zeolites [28], silica [29], and those containing activated carbons [30][31][32] have been evaluated as CO 2 sorbents. Some of these materials possess unique thermal properties, high chemical stability, high surface area, tunable chemical structures, recyclability, and reusability.…”

“…Activated carbon has been prepared from different materials such as polymers, resins, and biomass and can be used as an efficient adsorbent for CO 2 [30]. Various chemical and physical processes have been conducted to activate and modify the surface area and pore volume of such adsorbents to increase their capacity for CO 2 capture.…”

Synthesis of Novel Heteroatom-Doped Porous-Organic Polymers as Environmentally Efficient Media for Carbon Dioxide Storage

“…Indeed, POPs containing heteroatoms (O, N, S, or P) can capture CO2 selectively over nitrogen and methane [50,[54][55][56]. The CO2 uptake using carbon-containing materials such as porous nanocarbons in the presence of additives (e.g., ethylenediamine and potassium oxalate) as media for CO2 adsorption was 1.9-4.6 mmol/g at 25 °C [27]. While carbon fibers containing polyacrylonitrile in the presence of potassium hydroxide led to a CO2 uptake of 2.7 mmol/g at 25 °C and 1 atm [28].…”