Time distribution of adsorption energies, local monolayer capacities, and local isotherms on heterogeneous surfaces by inverse gas chromatography

Katsanos, NA; Arvanitopoulou, E; Roubani-Kalantzopoulou, F; Kalantzopoulos, A

dc.contributor.author	Katsanos, NA	en
dc.contributor.author	Arvanitopoulou, E	en
dc.contributor.author	Roubani-Kalantzopoulou, F	en
dc.contributor.author	Kalantzopoulos, A	en
dc.date.accessioned	2014-03-01T01:15:20Z
dc.date.available	2014-03-01T01:15:20Z
dc.date.issued	1999	en
dc.identifier.issn	10895647	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13444
dc.subject	Inverse Gas Chromatography	en
dc.title	Time distribution of adsorption energies, local monolayer capacities, and local isotherms on heterogeneous surfaces by inverse gas chromatography	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/jp984041h	en
heal.identifier.secondary	http://dx.doi.org/10.1021/jp984041h	en
heal.publicationDate	1999	en
heal.abstract	A new inverse gas chromatographic methodology is introduced to measure local (homogeneous) adsorption energies, ∈, local monolayer capacities, cmax, and adsorption isotherms, θi(p,T,∈) for probe gases on heterogeneous solid surfaces in the presence of nitrogen as carrier gas. The method does not depend on analytical solutions of the classical integral equation comprising the adsorption energy distribution function f(∈) as unknown, nor on numerical solutions and estimations from this equation, using powerful computers. It simply uses a time function of the chromatographic peaks obtained by short flow-reversals of the carrier gas, combined with the local isotherm model of Jovanovic. All three adsorption parameters ∈, cmax, and θi(p,T,∈) mentioned above can be calculated as a function of the experimental time and refer to instantaneous equilibration of the probe gases with the heterogeneous surface, with different kinds of active sites i being involved at different times. The kinetic physicochemical parameters for the adsorption phenomenon are also included for the gas/solid systems studied, being C2H4/ZnO, C2H4/PbO, C3H6/PbO, and C3H6/CaCO3. A comparison of the adsorption energy values found for these systems with heats of adsorption reported elsewhere is impermissible, since the latter refer to overall values and not to local values as in the present method. However, some literature values seem rather comparable to the present ones. © 1999 American Chemical Society.	en
heal.journalName	Journal of Physical Chemistry B	en
dc.identifier.doi	10.1021/jp984041h	en
dc.identifier.volume	103	en
dc.identifier.issue	7	en
dc.identifier.spage	1152	en
dc.identifier.epage	1157	en