Effective transport properties for the pyridine-granular activated carbon adsorption system
| Autor: | C.G. Aguilar-Madera, Sergio A. Baz-Rodríguez, Raúl Ocampo-Pérez, J. P. Ruelas-Leyva |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Surface diffusion
Work (thermodynamics) Granular activated carbon Chemistry Scanning electron microscope General Chemical Engineering Kinetics Mass diffusivity Thermodynamics Pyridine adsorption lcsh:TP155-156 Thermal diffusivity Adsorption Pore and surface effective diffusion lcsh:Chemical engineering Microscale chemistry Method of volume averaging |
| Zdroj: | Brazilian Journal of Chemical Engineering, Vol 29, Iss 3, Pp 599-612 (2012) Brazilian Journal of Chemical Engineering v.29 n.3 2012 Brazilian Journal of Chemical Engineering Associação Brasileira de Engenharia Química (ABEQ) instacron:ABEQ Brazilian Journal of Chemical Engineering, Volume: 29, Issue: 3, Pages: 599-612, Published: SEP 2012 |
| ISSN: | 1678-4383 0104-6632 |
| Popis: | In this work, the kinetics of pyridine adsorption onto granular activated carbon was studied from the point of view of an up-scaling process by using the method of volume averaging. The pore and surface effective diffusivities were estimated by supposing simple microscale geometries (ordered media of cylinders and spheres) and those of images processed from SEM (Scanning Electron Microscopy) micrographs. In addition, as a rough estimate, the point surface diffusivity is reported. The results revealed that the up-scaled diffusional model satisfactorily interpreted the concentration decay curves and the effective diffusivity was found to be an increasing function of the concentration, mainly due to the contribution of surface diffusion. In general, the diffusivity coefficients involved in the adsorption system are related through the expression molecular diffusivity = 22 ï‚' point surface diffusivity = 5/2 x‚' pore effective diffusivity = 1/12 x ‚' surface effective diffusivity. |
| Databáze: | OpenAIRE |
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