The mechanism of the adsorption of water molecules on carbon adsorbents

Abstract

The first-order correct-boundary Coulomb-Born distorted-wave approximation is used to study the double-electron capture by protons from the ground-state helium atoms at intermediate and high impact energies. The differential double capture cross sections are obtained as a function of the projectile scattering angle and the total cross sections as a function of the impact energy. In the considered range of impact energy, our calculation shows that although the results are not so sensitive to the static inter-electronic correlations in the initial channel, the strong final-state correlations have a large effect on the magnitudes of the double capture cross sections. The calculated differential and integral cross sections are compared with their available experimental values. The comparison shows a good agreement between the present calculations and the measurements. The comparison of the integral cross sections shows that the present approach is compatible with other theories.

Gas-Chromatographic Studies of the Interaction between Water and Methanol Molecules and the Surface of Carbon Materials

“…An extremely important prerequisite to the studies of the interaction of water and methanol with carbon materials is the thermal pre-processing of the samples (Vartapetyan and Voloshchuk, 1995;Tarasevich et al, 1998;Kiselev and Yashin, 1967). In our experiments it was shown that pre-processing of the GTCB at 200 • C resulted in the fact that no elution peaks were observed after the injection of first few portions of water into the column packed with the adsorbent, which indicates that at the initial stage the water molecules are chemisorbed by the sorbent.…”

“…Table 1) characteristic of these materials are formed mainly by the gaps between adjacent lamellar particles. However, during thermal processing, a rolling of graphite particles can take place, which results in the formation of void tube-like structures with an internal radius r ≈ 25 nm (Vartapetyan and Voloshchuk, 1995).…”

“…To determine the concentration of hydrophilic centres, an adsorption method was proposed where water was used as the adsorbate (Vartapetyan and Voloshchuk, 1995). However, certain doubts were expressed regarding the reliability of this method (Tarasevich, 2001a) in view of the ability of water molecules to be adsorbed at the hydrophilic centres with formation of clusters.…”

Peculiarities in the Water Adsorption and Morphology of Carbon Chars Assessed by NMR

“…Figure 3 demonstrates the appearance and growth of two water proton NMR lines. Initially only line B appeared, which obviously demonstrates that the adsorption process begins in micropores, which serve as primary adsorption centers and accumulate water molecules (15,(20)(21)(22). Line A does not appear until the integral intensity of line B reaches the saturation value equal to that for suspension.…”

Adsorption analysis of carbon dioxide, hydrocarbons and moisture on carbon

“…Most of the experimental studies on adsorption of H 2 O by microporous carbons have shown that the surface functional groups play the main role [140,[161][162][163][164], and some of these studies have investigated the role of surface groups by exposing carbon materials to controlled oxidative treatments [156,164].…”