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Received February 8, 2001
Accepted May 16, 2001
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Adsorption Equilibrium and Kinetics of H2O on Zeolite 13X
External Relations Department, Procter & Gamble Korea, Seoul 120-749, Korea 1Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea
Korean Journal of Chemical Engineering, July 2001, 18(4), 525-530(6), 10.1007/BF02698301
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Abstract
The adsorption characteristics of H2O on zeolite 13X were measured by a gravimetric method. The adsorption isotherm showed type II isotherm and was fitted by using both the excess surface work (ESW) model and Langmuir-Freundlich model. The results predicted by the Langmuir-Freundlich model were much smaller than the experimental results at higher-pressure region. However, the ESW model agreed well with the experimental data over the whole pressure region. In this case, a plot of the change in chemical potential versus the amount adsorbed gave two linear regions due to secondary effects such as capillary condensation. The experimental uptake curves were well fitted by several LDF models and solid diffusion model with the error range of 1.5-3.5%. Unlike the expectation that the more rigorous solid diffusion model would fit better, Nakao-Suzuki model showed the best agreement with experimental uptake data.
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References
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