Study of hydrogen sulfide adsorption on activated carbons using inverse gas chromatography at infinite dilution

Citation
A. Bagreev et Tj. Bandosz, Study of hydrogen sulfide adsorption on activated carbons using inverse gas chromatography at infinite dilution, J PHYS CH B, 104(37), 2000, pp. 8841-8847
Citations number
31
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
15206106 → ACNP
Volume
104
Issue
37
Year of publication
2000
Pages
8841 - 8847
Database
ISI
SICI code
1520-6106(20000921)104:37<8841:SOHSAO>2.0.ZU;2-9
Abstract
Adsorption of hydrogen sulfide on fifteen samples of activated carbons (unm odified and catalytic with introduced basic nitrogen groups) was studied us ing inverse gas chromatography (IGC) at infinite dilution. Porous structure of carbons was evaluated using sorption of nitrogen. From the retention vo lume measured in IGC experiments, heats of adsorption, free energy of adsor ption, entropy, and Henry's constants were calculated. The results showed t he dependence of these quantities on pore sizes of the adsorbents. The stro ng dependence of the isosteric heat of adsorption on the temperature of mea surement and, following this, unusually high heat capacity suggest the stro ng effect of specific interactions and catalytic influence of carbon surfac e even unmodified. The calculated Henry's constants are in agreement with t he Literature data. The adsorption on carbons with incorporated basic nitro gen groups is characterized by stronger adsorbent-adsorbate interactions th an on unmodified carbons.