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Polydisperse mixture adsorption kinetics
Author(s) -
Muralidhar Ramachandran,
Talbot Julian
Publication year - 1993
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.690390807
Subject(s) - adsorption , desorption , kinetics , thermodynamics , chemistry , blocking effect , moment (physics) , materials science , chemical engineering , physics , classical mechanics , psychology , developmental psychology , engineering
We present a theoretical study of the adsorption kinetics of particles with a continuous distribution of sizes. If the particles interact with short‐ranged forces, the diminishing rate of adsorption with increasing surface coverage can be attributed to a geometrical blocking effect of the preadsorbed particles. We exploit the fact that at low coverages the blocking effects result from isolated adsorbed particles to develop an analytic description of the adsorption kinetics using a moment expansion approach. We evaluate the time‐dependent surface coverage, density and the average size of the adsorbed particles and compare these quantities with those of the bulk phase. The effect of desorption is studied by introducing a size‐independent desorption constant, and the corresponding adsorption equilibria properties, which are valid at low coverages, are derived. Simulation results for irreversible adsorption are obtained and compared with the theoretical predictions.