Control of the spatial homogeneity of pore surface chemistry in particulate activated carbon
| Autor: | S. Hadi Madani, Philip Kwong, Francisco Rodríguez-Reinoso, Mark J. Biggs, William Skinner, Phillip Pendleton, Ronald J. Smernik, Cheng Hu, Ana Silvestre-Albero, Saeid Sedghi |
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| Přispěvatelé: | Sedghi, Saeid, Madani, S. Hadi, Hu, Cheng, Silvestre-Albero, Ana, Skinner, William, Kwong, Philip, Pendleton, Phillip, Smernik, Ronald J., Rodriguez-Reinoso, Francisco, Biggs, Mark J., Universidad de Alicante. Departamento de Química Inorgánica, Universidad de Alicante. Instituto Universitario de Materiales, Materiales Avanzados |
| Rok vydání: | 2015 |
| Předmět: |
education
chemistry.chemical_element surface chemistry Ether 02 engineering and technology 010402 general chemistry 01 natural sciences pore surface chemistry.chemical_compound medicine Organic chemistry General Materials Science spatial homogeneity Química Inorgánica activated carbons Chemistry Pore surface chemistry Particulate activated carbon General Chemistry Particulates 021001 nanoscience & nanotechnology humanities 0104 chemical sciences Quinone Chemical engineering 13. Climate action Yield (chemistry) Particle Limiting oxygen concentration 0210 nano-technology Carbon Activated carbon medicine.drug |
| Zdroj: | Carbon. 95:144-149 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2015.08.019 |
| Popis: | We show here that a physical activation process that is diffusion-controlled yields an activated carbon whose chemistry – both elemental and functional – varies radially through the particles. For the ∼100 μm particles considered here, diffusion-controlled activation in CO2 at 800 °C saw a halving in the oxygen concentration from the particle periphery to its center. It was also observed that this activation process leads to an increase in keto and quinone groups from the particle periphery towards the center and the inverse for other carbonyls as well as ether and hydroxyl groups, suggesting the two are formed under CO2-poor and -rich environments, respectively. In contrast to these observations, use of physical activation processes where diffusion-control is absent are shown to yield carbons whose chemistry is radially invariant. This suggests that a non-diffusion limited activation processes should be used if the performance of a carbon is dependent on having a specific optimal pore surface chemical composition. SS acknowledges the award of Adelaide Scholarships International (ASI) from the University of Adelaide. SHM acknowledges the award of a President's Scholarship from the University of South Australia. CH acknowledges a joint scholarship provided by China Scholarship Council (CSC) and the University of Adelaide. The support of the Australian Research Council Discovery Program (DP110101293) is also gratefully acknowledged. |
| Databáze: | OpenAIRE |
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