Heats of adsorption and capillary condensation of pentane on silica gel
The calorimetric heat of the capillary condensation of pentane in silica gel mesopores with mean pore diameter of about 20 nm is 0.7RT less than the isosteric heat and virtually the same as the value calculated by a thermodynamic method relative to a single adsorption isotherm. In the region of the completion of adsorption (as for other uniformly porous silica gels with small pore size), extrema are observed in the dependence of the differential heats on occupancy. The differential entropy of pentane upon capillary condensation in silica gel pores with mean diameter about 20 nm is only about 2 J/mole x /sup 0/K less than the entropy of the normal liquid, i.e., the state of this adsorbate is virtually indistinguishable from that of liquid pentane.
- Research Organization:
- Institute of Physical Chemistry, Moscow, USSR
- OSTI ID:
- 6477035
- 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. 35:6; ISSN BACCA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Adsorption, wetting, and capillary condensation of nonpolar fluids in mica slits
Moisture transport in silica gel particle beds. [DESSICANT]
Related Subjects
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORBENTS
ADSORPTION
ADSORPTION HEAT
ADSORPTION ISOTHERMS
ALKANES
CALORIMETRY
CATALYSTS
CATALYTIC EFFECTS
CRYSTAL STRUCTURE
ENTHALPY
ENTROPY
HYDROCARBONS
ISOTHERMS
MICROSTRUCTURE
ORGANIC COMPOUNDS
PENTANE
PHYSICAL PROPERTIES
POROSITY
SILICA GEL
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SURFACE TENSION
THERMODYNAMIC PROPERTIES
VAPOR CONDENSATION