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Estimation of diffusivity of alkaline metals in graphite lattice from oxidation rate measurements
Author(s) -
Shimizu Akira,
Akuzawa Noboru
Publication year - 2000
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.5450780321
Subject(s) - graphite , thermal diffusivity , lattice (music) , cylinder , materials science , kinetic energy , reaction rate , potassium , inorganic chemistry , chemistry , thermodynamics , analytical chemistry (journal) , metallurgy , organic chemistry , geometry , physics , catalysis , mathematics , quantum mechanics , acoustics
A reaction model has been developed for the estimation of diffusivity of the intercalated species in graphite on the basis of a material balance expressed in terms of cylindrical coordinates, where the species in the layered structural cylinder diffuse radially from the center to the surface and react with gas. The resultant kinetic equations are used to analyze the experimental data for the oxidation rate of potassium atoms intercalated in natural graphite powder of initially different sizes intercalated at the first stage.