| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 222153 | Journal of Environmental Chemical Engineering | 2014 | 9 Pages |
•Adsorption of 1-propanol and ortho-xylene with and without competition on silica.•Modeling the variation of silica surface coverage with the adsorption temperature.•Comparison of experimental curves with Temkin and Langmuir models.•Determination of the heats of adsorption of 1-propanol and ortho-xylene on silica.•Highlighting the presence of interactions between adspecies on silica.
Single and binary adsorptions of ortho di-methyl benzene and 1-propanol on silica at 300 K and at various adsorption pressures were studied using temperature programmed adsorption equilibrium (TPAE) procedure. The evolutions of the surface coverage with the adsorption temperature (θe = f(Ta)) were compared to the Temkin and Langmuir models in order to determine the heats of adsorption and to reveal the presence of mutual interactions between adspecies. It has been shown that in single adsorption equilibrium of 1-propanol on silica, the heats of adsorption were found to be dependent to the surface coverage. In contrast, of single adsorption equilibrium of ortho di-methyl benzene on silica, the heat of adsorption was found independent to the surface coverage. However, in the competitive adsorption, the heats of adsorption of the adsorbates were found varied with the surface coverage. The variation of heats in single and in binary adsorption characterizes the mutual interactions between the adspecies.
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