Ethyl Acetate Adsorption onto Activated Carbon
| Autor: | Koki Urita, Katsumi Kaneko, Peter Branton |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
General Chemical Engineering
Inorganic chemistry lcsh:QD450-801 Ethyl acetate lcsh:Physical and theoretical chemistry Surfaces and Interfaces General Chemistry Microporous material chemistry.chemical_compound Adsorption chemistry Desorption Specific surface area medicine Molecule Liquid density Activated carbon medicine.drug |
| Zdroj: | Adsorption Science & Technology, Vol 28 (2010) |
| ISSN: | 2048-4038 0263-6174 |
| DOI: | 10.1260/0263-6174.28.10.895 |
| Popis: | The adsorption and desorption of ethyl acetate on a coconut-based activated carbon has been studied using static and flow adsorption methods at different temperatures from 295 K to 325 K. The adsorbed state of ethyl acetate was studied using nitrogen adsorption at 77 K after the pre-adsorption of ethyl acetate. The adsorption isotherms of ethyl acetate were of Type I in the IUPAC classification, suggesting micropore filling by ethyl acetate molecules. The micropore volume of the activated carbon as evaluated from ethyl acetate adsorption using the liquid density of ethyl acetate agreed well with that from nitrogen adsorption. Nitrogen adsorption after pre-adsorption of ethyl acetate indicated considerably packed molecular states of ethyl acetate molecules within the micropores. Thus, ethyl acetate molecules can migrate to the deeper parts of micropores in the case of static adsorption measurements. However, the specific surface area evaluated from ethyl acetate adsorption was nearly 40% smaller than that from nitrogen adsorption under the assumption of an isotropic structure. The assumption of a highly orientated adsorption structure for ethyl acetate molecules on the pore wall led to a good correlation even as far as the surface area was concerned. In addition, 26 kJ/mol of the excess stabilization energy determined from the temperature dependence of the ethyl acetate adsorption isotherm supports the favourable molecular alignment of ethyl acetate molecules which increases the molecule–pore wall interactions. |
| Databáze: | OpenAIRE |
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