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Concentration dependence of surface diffusion coefficient of propionic acid in activated carbon particles
Author(s) -
Suzuki Motoyuki,
Fujii Takao
Publication year - 1982
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690280303
Subject(s) - diffusion , adsorption , activated carbon , chemistry , pellets , effective diffusion coefficient , thermodynamics , surface diffusion , flux (metallurgy) , steady state (chemistry) , analytical chemistry (journal) , chromatography , organic chemistry , materials science , medicine , physics , radiology , magnetic resonance imaging , composite material
A Wicke Kallenbach type steady state diffusion experiment was performed for varying concentrations of propionic acid solution through activated carbon pellets. Since surface diffusion is a dominant mechanism, concentration dependence of the surface diffusion coefficient is precisely determined from the change of diffusion flux with concentration. Strong dependence of surface diffusion coefficient on amount adsorbed is partially interpreted in terms of the change of heat of adsorption with surface coverage as determined from separate equilibrium runs.