CO₂adsorption characteristics of slit-pore shaped activated carbon prepared from cokes with high crystallinity

Abstract

High crystallinity coke-based activated carbon (hc-AC) is prepared using a potassium hydroxide solution to adsorb carbon dioxide (CO 2 ). The CO 2 adsorption characteristics of the prepared hc-AC are investigated at different temperatures. The X-ray diffraction patterns indicate that pitch-based cokes prepared under high temperature and pressure have a high crystal structure. The textural properties of hc-AC indicate that it consists mainly of slit-like pores. Compared to other textural forms of AC that have higher pore volumes, this slit-poreshaped hc-AC exhibits higher CO 2 adsorption due to the similar shape between its pores and CO 2 molecules. Additionally, in these high-crystallinity cokes, the main factor affecting CO 2 adsorption at lower temperature is the pore structure, whereas the presence of oxygen functional groups on the surface has a greater impact on CO 2 adsorption at higher temperature.

KOH-activated graphite nanofibers as CO2adsorbents

“…Such materials include activated carbon, activated carbon fibers, carbon nanofibers, graphite nanofibers (GNFs), mesoporous carbons, and graphite [16][17][18][19][20][21][22]. Among these, activated carbons and activated carbon fibers have been widely used in the field of CO 2 adsorption.…”

Cu nanoparticle-embedded carbon foams with improved compressive strength and thermal conductivity

“…Norwood, MA, USA) and a sample size of 3 × 3 × 3 mm 3 . The compressive strengths of at least five samples were tested.…”

“…3a and b. Pi was the non-treated CFm used as a reference material; it exhibited a thermal conductivity of 2.50 ± 0.00 W/mK and a compressive strength of 8.05 ± 1.72 MPa at a low apparent density of 0.69 g/cm 3 . The thermal conductivities and compressive strengths of the Pi-2.5Cu, Pi-3.7Cu, and Pi-5.0Cu were 3.86 ± 0.00, 1.98 ± 0.04, and 1.61 ± 0.05 W/mK and 10.04 ± 4.46, 4.52 ± 0.82, and 2.98 ± 0.14 MPa, respectively, with apparent densities of 0.83, 0.47, and 0.61 g/cm tion affected the thermal conductivity and compressive strength of the resulting CFms and the size of the Cu nanoparticles.…”

“…These properties are attractive in various applications such as thermal and electrical transfer devices, electrochemical supercapacitors, catalyst supports, gas adsorbents, filtration systems, and electromagnetic shielding. However, compared to metals and polymers, CFms do not exhibit good mechanical or thermal properties because of their porous structure; these shortcomings have limited the application of CFms in various fields [1][2][3][4].Researchers have sought to improve the mechanical and thermal properties of CFms through the addition of carbon nanofibers, carbon nanotubes, graphite and metal plating [5,6]. CFms/copper composites were recently studied by Johnson et al [7], who examined the thermal conductivity of wood-derived graphite and copper-graphite composites produced via electrodeposition.…”

“…These properties are attractive in various applications such as thermal and electrical transfer devices, electrochemical supercapacitors, catalyst supports, gas adsorbents, filtration systems, and electromagnetic shielding. However, compared to metals and polymers, CFms do not exhibit good mechanical or thermal properties because of their porous structure; these shortcomings have limited the application of CFms in various fields [1][2][3][4].…”