Abstract
Removal of organic sulfur compounds from its solution has been investigated by using adsorption on the ion-exchanged Y zeolites. Effects of metal cations, calcination temperature and reaction temperature on the removal efficiency have been accessed by performing the dynamic and static tests. The adsorbents were characterized by X-ray fluorescence analysis (XRF), X-ray diffraction (XRD), thermal analysis (TGA) and X-ray photoelectron spectroscopy (XPS). Pyridine-FTIR spectroscopy showed that Lewis acid is contributed to increase the adsorption capacity, while Brønsted acid has an adverse effect on the desulfurization capability. Spectral shifts of the ν(C–S), ν(S–S) and ν(Cu–S) vibrations of the Cu–Y zeolite after adsorption of DMDS were measured with the Raman spectrum. In situ Fourier transform infrared (FTIR) and temperature-programmed desorption of DMDS (DMDS–TPD) results indicated that the adsorption mechanisms on Cu(I)-Y zeolite was the S–M (σ) bond which formed to increase adsorption bond energy of DMDS.
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