Open AccessCalorimetric and Isosteric Heats of Adsorption of Substances with Molecules of Different Electronic Structure
Author(s) -
Boris Kuznetsov,
Ninh Anh Tuan,
Tamara A. Rachmanova
Publication year - 1989
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361748900600104
Subject(s) - chemistry , adsorption , pentane , zeolite , acetonitrile , thermodynamics , molecule , standard enthalpy of formation , atmospheric temperature range , calorimetry , enthalpy , carbon fibers , chromatography , organic chemistry , catalysis , physics , materials science , composite number , composite material
Calorimetric heats of adsorption have been measured for iso- and cyclo-pentane on NaX(86) zeolite at 140°C and for acetonitrile on carbon black and silica gel at 150°C. These heats have been compared with the corresponding isosteric values, calculated from isotherms measured over temperature ranges whose average values correspond to the above temperatures. The isosteric heats of adsorption coincide well with the calorimetric values in those cases where no change occurs in the mechanism for adsorbate–adsorbent interaction within the temperature range over which the isotherms have been measured. If this condition is not observed, the difference between the two sets of values can be quite considerable.