Cooperative CO adsorption promotes high CO adsorption density over wide optimal nanopore range
Separation of CO 2 based on adsorption, absorption, and membrane techniques is a crucial technology necessary to address current global warming issues. Porous media are essential for all these approaches and understanding the nature of the porous structure is important for achieving highly efficient...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2018-02-01
|
| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/0263617417713573 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841564590091010048 |
|---|---|
| author | Lei Chen Takumi Watanabe Hirofumi Kanoh Kenji Hata Tomonori Ohba |
| author_facet | Lei Chen Takumi Watanabe Hirofumi Kanoh Kenji Hata Tomonori Ohba |
| author_sort | Lei Chen |
| collection | DOAJ |
| description | Separation of CO 2 based on adsorption, absorption, and membrane techniques is a crucial technology necessary to address current global warming issues. Porous media are essential for all these approaches and understanding the nature of the porous structure is important for achieving highly efficient CO 2 adsorption. Porous carbon is considered to be a suitable porous media for investigating the fundamental mechanisms of CO 2 adsorption, because of its simple morphology and its availability in a wide range of well-defined pore sizes. In this study, we investigated the dependence of CO 2 adsorption on pore structures such as pore size, volume, and specific surface area. We also studied slit-shaped and cylindrical pore morphologies based on activated carbon fibers of 0.6–1.7 nm and carbon nanotubes of 1–5 nm, respectively, with relatively uniform structures. Porous media with larger specific surface areas gave higher CO 2 adsorption densities than those of media having larger pore volumes. Narrower pores gave higher adsorption densities because of deep adsorption potential wells. However, at a higher pressure CO 2 adsorption densities increased again in nanopores including micropores and small mesopores. The optimal pore size ranges of CO 2 adsorption in the slit-shaped and cylindrical carbon pores were 0.4–1.2 and 1.0–2.0 nm, respectively, although a high adsorption density was only expected for the narrow carbon nanopores from adsorption potentials. The wider nanopore ranges than expected nanopore ranges are reasonable when considering intermolecular interactions in addition to CO 2 –carbon pore interactions. Therefore, cooperative adsorption among CO 2 in relatively narrow nanopores can allow for high density and high capacity adsorption. |
| format | Article |
| id | doaj-art-d180069cebc44f6bb3173ac63a65fb84 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2018-02-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-d180069cebc44f6bb3173ac63a65fb842025-01-02T22:38:03ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382018-02-013610.1177/0263617417713573Cooperative CO adsorption promotes high CO adsorption density over wide optimal nanopore rangeLei ChenTakumi WatanabeHirofumi KanohKenji HataTomonori OhbaSeparation of CO 2 based on adsorption, absorption, and membrane techniques is a crucial technology necessary to address current global warming issues. Porous media are essential for all these approaches and understanding the nature of the porous structure is important for achieving highly efficient CO 2 adsorption. Porous carbon is considered to be a suitable porous media for investigating the fundamental mechanisms of CO 2 adsorption, because of its simple morphology and its availability in a wide range of well-defined pore sizes. In this study, we investigated the dependence of CO 2 adsorption on pore structures such as pore size, volume, and specific surface area. We also studied slit-shaped and cylindrical pore morphologies based on activated carbon fibers of 0.6–1.7 nm and carbon nanotubes of 1–5 nm, respectively, with relatively uniform structures. Porous media with larger specific surface areas gave higher CO 2 adsorption densities than those of media having larger pore volumes. Narrower pores gave higher adsorption densities because of deep adsorption potential wells. However, at a higher pressure CO 2 adsorption densities increased again in nanopores including micropores and small mesopores. The optimal pore size ranges of CO 2 adsorption in the slit-shaped and cylindrical carbon pores were 0.4–1.2 and 1.0–2.0 nm, respectively, although a high adsorption density was only expected for the narrow carbon nanopores from adsorption potentials. The wider nanopore ranges than expected nanopore ranges are reasonable when considering intermolecular interactions in addition to CO 2 –carbon pore interactions. Therefore, cooperative adsorption among CO 2 in relatively narrow nanopores can allow for high density and high capacity adsorption.https://doi.org/10.1177/0263617417713573 |
| spellingShingle | Lei Chen Takumi Watanabe Hirofumi Kanoh Kenji Hata Tomonori Ohba Cooperative CO adsorption promotes high CO adsorption density over wide optimal nanopore range Adsorption Science & Technology |
| title | Cooperative CO adsorption promotes high CO adsorption density over wide optimal nanopore range |
| title_full | Cooperative CO adsorption promotes high CO adsorption density over wide optimal nanopore range |
| title_fullStr | Cooperative CO adsorption promotes high CO adsorption density over wide optimal nanopore range |
| title_full_unstemmed | Cooperative CO adsorption promotes high CO adsorption density over wide optimal nanopore range |
| title_short | Cooperative CO adsorption promotes high CO adsorption density over wide optimal nanopore range |
| title_sort | cooperative co adsorption promotes high co adsorption density over wide optimal nanopore range |
| url | https://doi.org/10.1177/0263617417713573 |
| work_keys_str_mv | AT leichen cooperativecoadsorptionpromoteshighcoadsorptiondensityoverwideoptimalnanoporerange AT takumiwatanabe cooperativecoadsorptionpromoteshighcoadsorptiondensityoverwideoptimalnanoporerange AT hirofumikanoh cooperativecoadsorptionpromoteshighcoadsorptiondensityoverwideoptimalnanoporerange AT kenjihata cooperativecoadsorptionpromoteshighcoadsorptiondensityoverwideoptimalnanoporerange AT tomonoriohba cooperativecoadsorptionpromoteshighcoadsorptiondensityoverwideoptimalnanoporerange |