Kinetics of physical adsorption by carbonaceous adsorbents of biporous structure

✍ Scribed by M.M. Dubinin; I.T. Erashko; O. Kadlec; V.I. Ulin; A.M. Voloshchuk; P.P. Zolotarev

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 775 KB
• Volume: 13
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(75)90231-6

✦ Synopsis

The X-ray technique has been applied in adsorption of X-ray-contrast substances for analysis of the nature of mass transfer in carbonaceous microporous adsorbents. The paper described the results of experimental study into the kinetics of adsorption of vapors of n-pentane by rink chloride active carbon Supersorbon, of benzene by active carbons with molecular-sieve properties MSC-5A and MSC-6A, of water by active carbon MSC-5A, and of methanol by potassium sulphide active carbon SK using the gravimetric method at a constant adsorptive pressure. It is shown that the homogeneous adsorbent model is unsuitable for description of the adsorption kinetics in the indicated systems. A theory of kinetics of physical adsorption by adsorbents of biporous structure has been developed. With the aid of the statistical-moments method, analytic relationships have been obtained which enable one to calculate the diffusion coefficients separately for adsorbing and transport pores. With the use of these equations, experimental data on the adsorption kinetics in the system n-pentane-Supersorbon have been analyzed. The results of experimental study into the adsorption kinetics by the gravimetric method are in good agreement with the results of investigation on the kinetics of adsorption of bromobenzene by active carbon MSC-5A using the X-ray technique.