The influence of temperature on effective diffusivity and adsorption kinetics for humid air—porous alumina
✍ Scribed by Lis Marcussen
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 534 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
The kinetics of water adsorption from an air stream on porous alumina is studied experimentally in a differential bed at five temperatures in the range 9+3-64.O"C. The mass transfer rate is calculated theoretically by means of a model, which considers simultaneous resistance to mass transfer in the pore system of the solid and in a film surrounding the particle. The adsorption equilibrium is described by the non-linear Freundlich isotherm. Comparison of experiments with theory shows that the model describes the adsorption kinetics adequately and allows the effective diffusivity in the porous solid to be calculated. This leads to the result that the effective diffusivity is decreased by a factor 3 when temperature is increased from 9+-64.O"C.