Time separation of adsorption sites on heterogeneous surfaces by inverse gas chromatography
The measurement of local (homogeneous) adsorption energiesε i , local monolayer capacities,c max * , local adsorption isotherms,θ i (p, T, ε), and probability density functions for adsorption, f(ε) and ϕ(ε,t), can be used to study the mechanism of adsorption of five gaseous hydrocarbons on the heterogeneous surface of magnesium oxide.
The method does not use analytical or numerical solutions of a classical integral equation comprisingf(ε) as unknown, but it depends on a time function of gas chromatographic peaks obtained by short flow-reversals of the carrier gas.
The results for adsorption of ethane, ethylene, acetylene, propene, and l-butene on MgO, in the absence and presence of O3 are given and discussed on the basis of a mechanism proposed earlier for argon on titatium dioxide.
Key WordsGas chromatography Inverse gas chromatography Adsorption sites Heterogeneous surfaces
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