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Résumé :
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This work mainly involved the investigation of the adsorption of propylmercaptan (PM) on modified bentonite adsorbents. The adsorbents were prepared by loading it separately with Cu2+, Cu+, Fe3+, and MnO4―. In general, these bentonite adsorbents tested for sulfur adsorption capacity at breakthrough followed the order: KMnO4―bentonite > Cu(I)―bentonite > Cu(II)―bentonite > Fe(III)―bentonite. Several factors that influence the desulfurization capability, including loading and baking temperature, were investigated. The results of X-ray diffraction (XRD), nitrogen sorption (BET), thermal analysis (TGA), and Fourier transform infrared (FT-IR) spectroscopy showed that the ability of modified bentonite to adsorb PM depends strongly on its surface chemistry, particularly on the presence of basic oxygen-containing groups and acid content. The high sulfur capacities of KMnO4―bentonite and Fe(III)―bentonite were because of the powerful oxidization of MnO4― and Fe3+. The high sulfur capacities of Cu(I)―bentonite and Cu(II)―bentonite were due to π-complexation.
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