Improved Pore-Size Analysis of Carbonaceous Adsorbents
An improvement was proposed for the pore-size analysis of active carbons based on low-temperature (77 K) nitrogen adsorption isotherms measured over a wide range of relative pressures (5 × 10 −7 –0.995). It was shown that the applicability of the Barrett, Joyner and Halenda (BJH) computational metho...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2002-04-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/026361702760254487 |
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| author | J. Choma M. Jaroniec M. Kloske |
| author_facet | J. Choma M. Jaroniec M. Kloske |
| author_sort | J. Choma |
| collection | DOAJ |
| description | An improvement was proposed for the pore-size analysis of active carbons based on low-temperature (77 K) nitrogen adsorption isotherms measured over a wide range of relative pressures (5 × 10 −7 –0.995). It was shown that the applicability of the Barrett, Joyner and Halenda (BJH) computational method based on the Kelvin equation could be extended significantly towards small mesopores and large micropores when a proper t-curve was used to represent the film thickness of nitrogen adsorbed on the carbon surface. It was proposed that the aforementioned t-curve be obtained from the nitrogen adsorption isotherm at 77 K on a macroporous carbon black by fitting its multilayer part to the calibrated t-curve for nitrogen adsorbed at 77 K on a macroporous silica. To date, the Harkins–Jura or Halsey t-curves have been used to describe the pressure-dependence of the film thickness. This appears to be inaccurate, especially in the range of low relative pressures. It was shown that this inaccuracy makes the pore-size analysis questionable. However, the t-curve proposed in this work gave the pore-size distribution functions for the carbons studied thereby reproducing the total pore volume and showing realistic behaviour in the range at the borderline between micropores and mesopores. |
| format | Article |
| id | doaj-art-119b7ebac699448596e0e6466498f912 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2002-04-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-119b7ebac699448596e0e6466498f9122025-01-03T01:22:47ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382002-04-012010.1260/026361702760254487Improved Pore-Size Analysis of Carbonaceous AdsorbentsJ. Choma0M. Jaroniec1M. Kloske2 Institute of Chemistry, Military Technical Academy, 00-908 Warsaw, Poland Department of Chemistry, Kent State University, Kent, OH 44-242, USA Institute of Chemistry, Military Technical Academy, 00-908 Warsaw, PolandAn improvement was proposed for the pore-size analysis of active carbons based on low-temperature (77 K) nitrogen adsorption isotherms measured over a wide range of relative pressures (5 × 10 −7 –0.995). It was shown that the applicability of the Barrett, Joyner and Halenda (BJH) computational method based on the Kelvin equation could be extended significantly towards small mesopores and large micropores when a proper t-curve was used to represent the film thickness of nitrogen adsorbed on the carbon surface. It was proposed that the aforementioned t-curve be obtained from the nitrogen adsorption isotherm at 77 K on a macroporous carbon black by fitting its multilayer part to the calibrated t-curve for nitrogen adsorbed at 77 K on a macroporous silica. To date, the Harkins–Jura or Halsey t-curves have been used to describe the pressure-dependence of the film thickness. This appears to be inaccurate, especially in the range of low relative pressures. It was shown that this inaccuracy makes the pore-size analysis questionable. However, the t-curve proposed in this work gave the pore-size distribution functions for the carbons studied thereby reproducing the total pore volume and showing realistic behaviour in the range at the borderline between micropores and mesopores.https://doi.org/10.1260/026361702760254487 |
| spellingShingle | J. Choma M. Jaroniec M. Kloske Improved Pore-Size Analysis of Carbonaceous Adsorbents Adsorption Science & Technology |
| title | Improved Pore-Size Analysis of Carbonaceous Adsorbents |
| title_full | Improved Pore-Size Analysis of Carbonaceous Adsorbents |
| title_fullStr | Improved Pore-Size Analysis of Carbonaceous Adsorbents |
| title_full_unstemmed | Improved Pore-Size Analysis of Carbonaceous Adsorbents |
| title_short | Improved Pore-Size Analysis of Carbonaceous Adsorbents |
| title_sort | improved pore size analysis of carbonaceous adsorbents |
| url | https://doi.org/10.1260/026361702760254487 |
| work_keys_str_mv | AT jchoma improvedporesizeanalysisofcarbonaceousadsorbents AT mjaroniec improvedporesizeanalysisofcarbonaceousadsorbents AT mkloske improvedporesizeanalysisofcarbonaceousadsorbents |