Open AccessInfluence of the Pore Diameter on the Adsorption Behaviour of Nonpolar Molecules on SiO2-Adsorbents
Author(s) -
H. Stach,
J. Jänchen,
H. Thamm,
E. Stiebitz,
Roman Vetter
Publication year - 1986
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 - 10.1177/026361748600300407
Subject(s) - adsorption , chemistry , enthalpy , butane , thermodynamics , decane , hexane , microporous material , molecule , chemical engineering , chromatography , organic chemistry , catalysis , engineering , physics
The adsorption equilibrium of n-paraffins (ethane, n-butane, n-hexane and n-decane) and some noble gases on SiO 2 -adsorbents with different pore diameter have been investigated using the techniques of isostere-, isotherm- and calorimetric-measurements. There is a strong influence of the pore diameter on the adsorption potential. As the pore diameter of the adsorbents increases the adsorption enthalpy decreases while the adsorption entropy increases. For the initial heats of adsorption of the n-alkanes an empirical equation is derived, allowing the calculation of the thermodynamic data in advance, knowing the (mean) pore diameter.