Primary Adsorption Centers Research Articles

Adsorption of water and the micropore structures of carbon adsorbents Communication 5. Pore structure parameters of thermally treated carbon adsorbents and the adsorption of water vapor on these materials

1. Carbonaceous adsorbents with various types of pore structures can be prepared by heating activated carbons in argon at temperatures ranging from 1000 to 2000°C. 2. X-ray studies show that crystallization and compacting of the carbon occur in carbons which have been subjected to such thermal treatment. 3. A study has been made of the adsorption of water vapor by the adsorbents prepared in this manner. Treatment at 1000–1600°C leads to only an insignificant alteration in the number of primary adsorption centers in the 0.31–0.19 mmole/g interval.

Adsorption of water vapor and the microporous structures of carbonaceous adsorbents. Communication 4. Adsorption isotherms of water vapor in the region of low relative pressures

1. The initial sections of the adsorption isotherms of water vapor on active carbons with different microporous structures have been studied in detail, and it has been shown that the isotherms have a convex section in the initial range of relative pressures up to p/ps=0.05. 2. The number of primary adsorption centers in these carbons has been estimated. A considerable increase in their number on the oxidization of the active carbon has been observed.

Surface and sorption properties of active carbons communication 2. Investigation of the effect of chemically adsorbed and chemisorbed oxygen on the adsorption properties of active carbons with respect to water vapor

1. An experimental procedure was developed and was applied to the study of the effect of the chemical state of the surface of an active carbon— as determined by chemical adsorption or chemisorption of oxygenon adsorption isotherms for water vapor. 2. it was shown that the formation of surface oxides has a very substantial effect, particularly on the adsorption region of the isotherm. 3. The question of the nature of the primary adsorption centers on the surface of active carbons was discussed on the basis of the experimental results. It was shown that the chemical adsorption of one molecule of oxygen results in the formation of approximately one primary adsorption center.