Abstract
The effective diffusivity of the catalyst was experimentally measured in both octanedecane and polystyrene-chloroform systems for comparison with effects identified in the coal liquefaction model work. The diffusivity data were in good agreement with the theoretical solution and their reproducibility was satisfactory. In both experimental systems, the effective diffusivity was strongly dependent upon the ratio of diffusing species to catalyst pore size. When the steric exclusionhydrodynamic drag theory was applied, the tortuosity significantly varied with the ratio of diffusing molecule to catalyst pore size. Using the diffusivity data of unimodal catalysts, an empirical equation relating the size ratio to the restrictive factor was derived to evaluate the diffusivity data of bimodal catalysts.
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References
Rhee, Y. W. and Guin, J. A.:KJChE,10. 56(1993).
Seo, G. and Massoth. F. E.:AIChE J.,31, 494 (1985).
Tsai, K.J.: Ph.D. Thesis, Auburn University, Auburn, AL(1985).
Prasher, B. D. and Ma, Y. H.:AIChE J.,23, 303 (1977).
Holman, J. P.: “Heat Transfer”, 6th ed., p. 155, McGraw-Hill Book Company, New York, 1986.
Crank, J.: “The Mathematics of Diffusion”, 2nd ed., p. 48 & 73, Oxford University Press, London, 1975.
Abramowitz, M. and Stegun, I.A.: “Handbook of Mathematical Functions”, p. 409, Dover Publications, Inc., New York, 1965.
Crank, J.: “The Mathematics of Diffusion”, 2nd ed., p. 57 & 77. Oxford University Press, London, 1975.
Colton, C. K., Satterfield, C. N. and Lai, C. J.:.AIChE J.,21. 289(1975).
Smith, D. M.:AIChE J.,32, 1039 (1986).
Satterfield, C. N., Colton, C. K. and Pitcher, W. H.:AIChE J.,19, 628(1973).
Chantong, A. and Massoth, F. E.:AIChE J.,29, 725 (1983).
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Rhee, YW., Guin, J.A. Effect of catalyst pore structure on effective diffusivity. Korean J. Chem. Eng. 11, 14–24 (1994). https://doi.org/10.1007/BF02697510
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DOI: https://doi.org/10.1007/BF02697510