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Surface diffusion as rate determining step in activated chemisorption
Author(s) -
Birnholtz Hella,
Nir Avinoam,
Lotan Noah,
Aharoni Chaim
Publication year - 1984
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450620211
Subject(s) - chemisorption , diffusion , adsorption , activation energy , sigmoid function , kinetics , thermodynamics , rate equation , surface diffusion , chemistry , diffusion equation , reciprocal , surface (topology) , physics , mathematics , classical mechanics , geometry , computer science , economics , linguistics , philosophy , economy , machine learning , artificial neural network , service (business)
It is assumed that heterogeneous surfaces contain regions with various activation energies for adsorption. Adsorbate is taken up at regions of low activation energy and it migrates subsequently to regions of higher energy by surface diffusion. Surface diffusion is activated and it determines the rate of the overall adsorption process. Expressions derived on the basis of this model are consistent with Aharoni–Ungarish (1976) rule concerning the kinetics of chemisorption, viz the plot of the reciprocal of the rate against the time is sigmoid and the kinetics obey successively the Bangham Equation, the Elovich equation, and a first order equation.