Removal
of organic sulfur compounds from its solution has been
investigated by using adsorption. The purpose of this study is to
investigate the removal of dimethyl disulfide (DMDS) in liquid hydrocarbon
streams with bentonite modified by Ag+. The addition of
Ag+ on the bentonite significantly enhanced the adsorption
capacity of DMDS. The adsorbents were characterized by nitrogen adsorption,
X-ray diffraction (XRD), and thermal analysis (TGA). Fourier transform
infrared (FT-IR) spectroscopy showed that the type and number of surface
acidic sites on the adsorbents could increase the adsorption capacity.
Several factors that influence the desulfurization capability, including
loading, reaction temperature, and calcination temperature, were studied.
The maximum sulfur adsorption capacity was obtained at a silver loading
of 6 wt %, and the optimum calcination temperature was 150 °C.
Spectral shifts of the ν(C–S), ν(S–S), and
ν(Ag–S) vibrations of the complex compound obtained by
the reaction of Ag+ and DMDS were measured with the Raman
spectrum. On the basis of complex adsorption reaction and hybrid orbital
theory, the adsorption on modified bentonite occurred via multilayer
intermolecular forces and S–M (σ) bonds.
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