Carbon monoliths by assembling carbon spheres for gas adsorption

Gao, Shuai and Ge, Lei ORCID: and Villacorta, Byron S. and Rufford, Thomas E. and Zhu, Zhonghua (2019) Carbon monoliths by assembling carbon spheres for gas adsorption. Industrial & Engineering Chemistry Research, 58 (12). pp. 4957-4969. ISSN 0888-5885


We report high-surface area, hierarchical pore structured, and robust activated carbon discs (ACDs) prepared via the assembly of micron-sized carbon spheres with mesophase pitch in a low-pressure foaming and carbonization process. The carbon disc ACDCS75 with the largest specific surface area (1338 m(2).g(-1)) was obtained from a blend of 75 wt % carbon spheres and 25 wt % mesophase pitch, and this ACD had a bulk density of 0.62 and a high compressive strength of 26.3 MPa. A nitrogen-doped ACDCS75 disc was prepared by postcarbonization ammonia treatment to study the effect of nitrogen-containing surface functional groups on the uptake of CO2 on ACDs. The adsorption of pure fluids CO2, CH4, and N-2 were measured at temperatures of 298, 308, and 318 K at pressures from 6 to 3496 kPa for CO2, pressures from 9 to 3996 kPa for CH4, and pressures from 7 to 3994 kPa for N-2 using a high-pressure gravimetric apparatus (Belsorp-BG). The equilibrium adsorption capacities of ACDCS75 measured at 298 K and pressure close to 1000 kPa were 5.67 mmol.g(-1) CO2, 3.60 mmol.g(-1) CH4, and 2.09 mmol.g(-1) N-2, and at 3500 kPa were 6.16 mmol.g(-1) CO2, 4.42 mmol.g(-1) CH4, and 3.18 mmol.g(-1) N-2. After ammonia treatment the capacities of N-ACDCS75 at 298 K and 1000 kPa were 6.22 mmol.g(-1) CO2, 3.70 mmol.g(-1) CH4, and 1.98 mmol.g(-1) N-2, and at 3500 kPa were 7.16 mmol.g(-1) CO2, 4.87 mmol.g(-1) CH4, and 3.32 mmol.g(-1) N-2. The pure gas equilibrium adsorption capacities were regressed to Toth and Langmuir models, and the uptake of components from gas mixtures was predicted using an ideal selectivity to make a preliminary evaluation of the potential to use these ACDs for gas separation. After N-doping the predicted changes in selectivities at 298 K and 100 kPa were from 6.0 to 7.2 for CO2 over N-2 and 2.8 to 3.3 for CH4 over N-2 on ACDCS75 compared to on N-ACDCS75.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 22 Aug 2019 04:37
Last Modified: 25 Sep 2019 05:28
Uncontrolled Keywords: doped activated carbon; mesophase-pitch; porous carbons; tar pitch; pressure-drop; co2 capture; coal powder; foams; ch4; separation
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry of Materials
09 Engineering > 0904 Chemical Engineering > 090401 Carbon Capture Engineering (excl. Sequestration)
Fields of Research (2020): 34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340305 Physical properties of materials
40 ENGINEERING > 4004 Chemical engineering > 400401 Carbon capture engineering (excl. sequestration)
Socio-Economic Objectives (2008): B Economic Development > 86 Manufacturing > 8606 Industrial Chemicals and Related Products > 860602 Inorganic Industrial Chemicals
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