Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm?
This work reviews the application of various standard isotherms to evaluate the micropore volume in a range of microporous materials. The selected materials have quite different surface chemistry, and are relevant due to their properties for adsorption and catalysis: zeolites, activated carbons, cla...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-12-01
|
| Series: | Catalysts |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4344/11/12/1544 |
| _version_ | 1797505993842622464 |
|---|---|
| author | João Pires Rafaela Fernandes Moisés L. Pinto Mary Batista |
| author_facet | João Pires Rafaela Fernandes Moisés L. Pinto Mary Batista |
| author_sort | João Pires |
| collection | DOAJ |
| description | This work reviews the application of various standard isotherms to evaluate the micropore volume in a range of microporous materials. The selected materials have quite different surface chemistry, and are relevant due to their properties for adsorption and catalysis: zeolites, activated carbons, clay-based materials and MOFs. Some cases were analysed before and after being used as supports in the heterogenization of homogeneous catalysts. The discussion is centred, but not limited, to the three standard isotherms that are mostly employed in the literature (<i>t</i>-curve, non-porous carbon and non-porous hydroxylated silica) for the assessment of the micropore volume. For a given material the values of the micropore volumes from the different standard isotherms were compared, particularly against the values from the largely used <i>t</i>-curve. The cases where major discrepancies were found could normally be ascribed to samples that have a broad micropore size distribution. |
| first_indexed | 2024-03-10T04:26:17Z |
| format | Article |
| id | doaj.art-e4e45399ff494efa9edaab5dceadfb2b |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T04:26:17Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-e4e45399ff494efa9edaab5dceadfb2b2023-11-23T07:35:12ZengMDPI AGCatalysts2073-43442021-12-011112154410.3390/catal11121544Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm?João Pires0Rafaela Fernandes1Moisés L. Pinto2Mary Batista3CQE, Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, PortugalCQE, Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, PortugalCERENA, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, PortugalCQE, Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, PortugalThis work reviews the application of various standard isotherms to evaluate the micropore volume in a range of microporous materials. The selected materials have quite different surface chemistry, and are relevant due to their properties for adsorption and catalysis: zeolites, activated carbons, clay-based materials and MOFs. Some cases were analysed before and after being used as supports in the heterogenization of homogeneous catalysts. The discussion is centred, but not limited, to the three standard isotherms that are mostly employed in the literature (<i>t</i>-curve, non-porous carbon and non-porous hydroxylated silica) for the assessment of the micropore volume. For a given material the values of the micropore volumes from the different standard isotherms were compared, particularly against the values from the largely used <i>t</i>-curve. The cases where major discrepancies were found could normally be ascribed to samples that have a broad micropore size distribution.https://www.mdpi.com/2073-4344/11/12/1544nitrogen-adsorptionstandard-isothermmicroporosity |
| spellingShingle | João Pires Rafaela Fernandes Moisés L. Pinto Mary Batista Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm? Catalysts nitrogen-adsorption standard-isotherm microporosity |
| title | Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm? |
| title_full | Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm? |
| title_fullStr | Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm? |
| title_full_unstemmed | Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm? |
| title_short | Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm? |
| title_sort | microporous volumes from nitrogen adsorption at 77 k when to use a different standard isotherm |
| topic | nitrogen-adsorption standard-isotherm microporosity |
| url | https://www.mdpi.com/2073-4344/11/12/1544 |
| work_keys_str_mv | AT joaopires microporousvolumesfromnitrogenadsorptionat77kwhentouseadifferentstandardisotherm AT rafaelafernandes microporousvolumesfromnitrogenadsorptionat77kwhentouseadifferentstandardisotherm AT moiseslpinto microporousvolumesfromnitrogenadsorptionat77kwhentouseadifferentstandardisotherm AT marybatista microporousvolumesfromnitrogenadsorptionat77kwhentouseadifferentstandardisotherm |