| Autor: |
Dubinin, M. M., Isirikyan, A. A., Nikolaev, K. M., Polyakov, N. S., Tatarinova, L. I. |
| Zdroj: |
Russian Chemical Bulletin; January 1987, Vol. 36 Issue: 1 p1-5, 5p |
| Abstrakt: |
1.Rehydration of the active sites of carbon and carbon black formed after vacuum heat treatment of the samples at high temperatures is reflected in the heats of their immersion in benzene and water: for carbon, the heat of immersion in benzene does not change, but the heat of immersion in water increases markedly, while the heat of immersion of carbon black in benzene decreases markedly and the heat of immersion in water almost does not change.2.All four basic stages of adsorption of water vapors on active carbon: 1) the formation of water clusters, 2) formation of a random monolayer, 3) volume filling of micropores, and 4) saturation with capillary condensation phenomena in the mesopores, are reflected in the curve of the dependence of the heats of immersion of carbon in benzene on the relative vapor pressure of the preadsorbed water.3.Based on the study of the heats of immersion of AC-47 active carbon in benzene as a function of the amount of preadsorbed water, the reality of the existence of a statistical monolayer or similarity of the monolayer of water in the micropores of nongraphitized active carbon not made chemically hydrophobic, formed in the narrow region of relative water vapor pressures from O.45 to O.6, was demonstrated. |
| Databáze: |
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