Investigation of the surface heterogeneity of solids from reversed-flow inverse gas chromatography

Journal of Chromatography. a
Dimitrios Gavril, Bernard E Nieuwenhuys

Abstract

In the present work, the novel methodology of the inverse gas chromatographic technique of reversed-flow gas chromatography (RF-GC) was applied to the well-studied catalytic oxidation of carbon monoxide over silica supported Pt, Rh and Pt-Rh alloy catalysts. Adsorption energies, local isotherms, local monolayer capacities, surface diffusion coefficients, lateral interaction energies and energy distribution functions are simultaneously determined in a single experiment. The variation of the determined physicochemical parameters against the nature of the studied catalysts (Pt content) is consistent with the observed catalytic activity. The energy distribution functions, estimated by means of RF-GC, give useful information about the "topography" and the nature of the active sites on the catalyst surface, similar to those of experimental techniques, such as Thermal Desorption Spectroscopy studies of the adsorption of CO on group VIII noble metal surfaces. The experimentally found results explain the superior activity of Pt0.25 + Rh0.75 alloy, in comparison to that of the pure Pt and Rh catalysts.

Citations

Jan 20, 2009·Journal of Chromatography. a·Fani Roubani-Kalantzopoulou
Aug 30, 2008·Journal of Chromatography. a·A GeorgakaB E Nieuwenhuys
Jun 30, 2006·Journal of Chromatography. a·Nicholas A KatsanosGeorge Karaiskakis
May 1, 2012·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Dimitrios GavrilGeorge Karaiskakis
Jul 4, 2009·Journal of Separation Science·Anastasiya KanatyevaAlexander Kurganov

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