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Analysis of Counter-diffusion of Aromatic Compounds on Alumina by Spectrophotometry
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1995, v.8 no.2, pp.205-213
Ko,
T., &
Chung,
K.
(1995). Analysis of Counter-diffusion of Aromatic Compounds on Alumina by Spectrophotometry. Analytical Science and Technology, 8(2), 205-213.
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Abstract
Counter-diffusion of coronene desorbed from alumina with addition of tetra-phenylporphine was studied by spectrophotometry. The counter-diffusion processes of adsorbing and desorbing materials in liquid phase were simulated by counter-diffusion model based on Fritz's binary component isotherm under an assumption of equimass diffusion. The counter-diffusivities of desorbed coronene with addition of tetra-phenylporphine were as <TEX>${\sim}10^{-15}m^2/sec$</TEX> and that of adsorbed tetra-phenylporphine as <TEX>${\sim}10^{-11}m^2/sec$</TEX>. The counter-diffusivity of coronene determined from desorption process was smaller by <TEX>${\sim}10^5$</TEX> times than the diffusivity determined from adsorption process of a single species. The reduction of the determined counter-diffusivity of coronene in desorption process was explained by the cross of diffusion fluxes and build-up of high gradient of coronene in pore.
- keywords
- diffusion, alumina, spectrophotometry
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