Conclusions
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1.
Study has been made of the effect of the crystal size (2R=1.5–45 μm) on the kinetics of the adsorption of ethane, propane, and n-butane on NaCaA zeolites (75% exchange) at −80°C and 23°C. Measurements were made by a constant-pressure gravimetric method, and by a constant volume, decreasing pressure, adsorption method, the working conditions being so chosen as to eliminate the possibility of effects from intercrystalline diffusion.
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2.
Effective diffusion coefficients calculated for an assumed intracrystalline transfer mechanism were found to be closely dependent on the crystal size. From this it was concluded that these effective values were not true coefficients for diffusion within the zeolite crystal. The relation in question here could be interpreted as indicating the existence of diffusional barriers on the crystal surface.
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Literature cited
M. M. Dubinin, I. T. Erashko (Eraško), O. Kadlec, V. I. Ulin, A. M. Voloshchuk (Vološčuk), and P. P. Zolotarev, Carbon,13, 193 (1975).
A. M. Voloshchuk, M. M. Dubinin, I. T. Erashko, P. P. Zolotarev, and V. I. Ulin, Izv. Akad. Nauk SSSR, Ser. Khim.,1974, 1943.
M. Kochirzhik and A. Zikanova, in: Adsorption and Porosity [in Russian], Nauka (1976), p. 296.
J. Kärger, M. Bülow, and Nguyen van Phat, Z. Phys. Chem. (DDR),257, 1217 (1976).
J. Kärger, H. Pfeifer, and M. Bülow, Z. Chem.,16, 85 (1976).
F. Danes and F. Wolf, Z. Phys. Chem. (Leipzig),252, 33 (1973).
Nguyen van Phat, Dissertation, Berlin (1976).
K. Pilchowski, F. Danes, and F. Wolf, Kolloid-Z. Z. Polym.,225, 6 (1968).
F. Danes, Dissertation, Halle-Wittenberg (1968).
D. M. Ruthven, R. J. Derrah, and K. F. Loughlin, Can. J. Chem.,51, 3514 (1973).
K. Pilchowski, F. Danes, and F. Wolf, Kolloid-Z. Z. Polym.,230, 328 (1969).
R. M. Barrer, Trans. Faraday Soc.,45, 358 (1949).
F. Danes, K. Pilchowski, and F. Wolf, Ber. Bunsenges. Phys. Chem.,73, 99 (1969).
J. Crank, The Mathematics of Diffusion, Oxford (1956).
J. Kärger and P. Herrmann, Ann. Phys.,31, 277 (1974).
K.-P. Rëte, A. Rëte, and D. Gel'bin, in: Adsorption and Porosity [in Russian], Nauka (1976), p. 306.
J. Kärger and J. Caro, J. Colloid Interface Sci.,52, 623 (1975).
J. Caro, J. Kärger, H. Pfeifer, and R. Schöllner, Z. Phys. Chem. (DDR),256, 698 (1975).
R. M. Barrer and D. J. Clarke, J. Chem. Soc. Faraday Trans. 1,70, 535 (1974).
A. Quig and L. V. C. Rees, J. Chem. Soc. Faraday Trans. 1,72, 771 (1976).
M. Byulov (Bülow), Kolloidn. Zh.,39, No. 2 (1978).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2666–2670, December, 1977.
The authors would like to thank Professor H. Pfeifer, R. Schllner, W. Schirmer, and Dr. Michel for a discussion of the results obtained here, and Prof. Dunken and K. H. Henneberg (University of Jena) for permission to use their apparatus. We also want to thank Prof. S~ P. Zhdanov, Dr. Finger, and Dr. Schmitz for having supplied the zeolite samples.
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Kärger, J., Caro, J. & Bülow, M. Effect of crystal size on the kinetics of alkane adsorption on NaCaA zeolites. Russ Chem Bull 26, 2464–2468 (1977). https://doi.org/10.1007/BF00924545
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DOI: https://doi.org/10.1007/BF00924545