To deeply remove dimethyl disulfide (DMDS) from oil, phosphotungstic acid (HPW) was supported on Cu3(BTC)2(Cu-BTC) by impregnation to improve the adsorption desulfurization performance. A series of Cu-BTC with different amounts of HPW were prepared and studied in batch adsorption desulfurization experiments. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), nitrogen adsorption-desorption were used to study the structural properties of adsorbents. Besides, reusability and adsorption performance under ultra-low sulfur conditions were also studied. The experimental results of adsorption desulfurization indicated that the HPW impregnation solution’s greatest concentration was 20% and showed the best performance of desulfurization-the maximum sulfur adsorption capacity of adsorbent was 45.1 mg S/g. The ultra-low sulfur adsorption experiment showed the same result. In the model oil with a sulfur content of 50ppm, the desulfurization rate of 20%HPW/Cu-BTC reached 86.4%, and the sulfur content of the model oil after adsorption was about 7 ppm, which could satisfy the requirements of clean oil. The results could provide an excellent adsorbent for removing DMDS from oil.
Keywords Adsorption desulfurization, Dimethyl disulf ide, Phosphotungstic acid