Carbon monoliths by assembling carbon spheres for gas adsorption
Article
Article Title | Carbon monoliths by assembling carbon spheres for gas adsorption |
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ERA Journal ID | 3890 |
Article Category | Article |
Authors | Gao, Shuai (Author), Ge, Lei (Author), Villacorta, Byron S. (Author), Rufford, Thomas E. (Author) and Zhu, Zhonghua (Author) |
Journal Title | Industrial and Engineering Chemistry Research |
Journal Citation | 58 (12), pp. 4957-4969 |
Number of Pages | 13 |
Year | 2019 |
Publisher | ACS Publications |
Place of Publication | United States |
ISSN | 0888-5885 |
1520-5045 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acs.iecr.8b04891 |
Web Address (URL) | https://pubs.acs.org/doi/10.1021/acs.iecr.8b04891 |
Abstract | 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 g.cm(3) 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. |
Keywords | doped activated carbon; mesophase-pitch; porous carbons; tar pitch; pressure-drop; co2 capture; coal powder; foams; ch4; separation |
ANZSRC Field of Research 2020 | 340305. Physical properties of materials |
400401. Carbon capture engineering (excl. sequestration) | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Western Sydney |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5416/carbon-monoliths-by-assembling-carbon-spheres-for-gas-adsorption
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