Heats of immersion of active carbon and carbon black in water and benzene as a function of the moisture content of the adsorbents

Journal Article · Fri Jul 10 04:00:00 EDT 1987 · Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States)

DOI:https://doi.org/10.1007/BF00953833· OSTI ID:5755418

Dubinin, M M; Isirikyan, A A; Nikolaev, K M; Polyakov, N S; Tatarinova, L I

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. 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. 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 0.45 to 0.6, was demonstrated.

• Research Organization: Institute of Physical Chemistry, Moscow, USSR
• OSTI ID: 5755418
• Journal Information: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States), Journal Name: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States) Vol. 36:1; ISSN BACCA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010500* -- Coal
Lignite
& Peat-- Products & By-Products
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ACTIVATED CARBON
ADSORBENTS
ADSORPTION
ADSORPTION HEAT
ADSORPTION ISOTHERMS
ANTHRACITE
AROMATICS
BENZENE
BLACK COAL
CARBON
CARBON BLACK
CARBONACEOUS MATERIALS
COAL
DEMETALLIZATION
ELEMENTS
ENERGY SOURCES
ENTHALPY
FLUIDS
FOSSIL FUELS
FUELS
GASES
HYDRATION
HYDROCARBONS
HYDROGEN COMPOUNDS
ISOTHERMS
MATERIALS
MOISTURE
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REGENERATION
SEPARATION PROCESSES
SOLVATION
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
VAPOR CONDENSATION
VAPORS
WATER
WATER VAPOR
WETTABILITY