Fractal Strategy for Improving Characterization of N<sub>2</sub> Adsorption–Desorption in Mesopores
The current studies primarily analyze the heterogeneity and complexity of mesopore structures based on low-temperature nitrogen (N<sub>2</sub>) adsorption curves and the Frenkel–Halsey–Hill (FHH) fractal model. However, these studies ignore the fact that the low-temperature N<sub>2...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-10-01
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| Series: | Fractal and Fractional |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2504-3110/8/11/617 |
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| Summary: | The current studies primarily analyze the heterogeneity and complexity of mesopore structures based on low-temperature nitrogen (N<sub>2</sub>) adsorption curves and the Frenkel–Halsey–Hill (FHH) fractal model. However, these studies ignore the fact that the low-temperature N<sub>2</sub> desorption curve can also reflect the desorption performance of the mesopore structure. In this research, novel fractal indicators for characterizing the adsorption–desorption performance of mesopores based on the fractal dimension from the N<sub>2</sub> adsorption curves and N<sub>2</sub> desorption curves are proposed. The novel fractal indicators <i>I</i><sub>1</sub> and <i>I</i><sub>2</sub> are applied to evaluate the adsorption–desorption performance of mesopores with pore size 2–5 nm and pore size 5–50 nm, respectively. The fractal indicator <i>I</i><sub>1</sub> shows an increasing trend with coalification, reflecting that the gas adsorption performance of 2–5 nm mesopores is enhanced with coalification. The fractal indicator <i>I</i><sub>2</sub> exhibits a trend of first increasing and then decreasing with coalification, indicating the gas desorption performance of mesopores with pore size 5–50 nm decreases first and then increases. The proposed indicators provide novel analytical parameters for further understanding the gas adsorption–desorption mechanism of porous coal-based or carbon-based materials. |
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| ISSN: | 2504-3110 |