Study On Adsorbents For Remove Organosulfur Compounds From Oil

As it is widely known that the sulfide in oil products has many detrimental effects, development of new deep desulfurization processes for oil products becomes one of the major challenges to the refining industry and to the producers of ultra-low-sulfur fuels for fuel cell applications.Desulfurization of fuels is achieved by many studies.In these studies,selective adsorption could provide an attractive means to remove the sulfides because of its simple operation and low cost.Nowadays,the studies are always concentrating on the sulfur species such as thiophene and benzothiophene,the Dimethyl sulfide(DMS) is less concentrated.There is a need for better adsorbents providing high adsorption capacity and ambient temperature operation utilizing appropriate solids without the need for pretreatment and regeneration.In this study,we used activated carbon;alumina and Y zeolite to remove DMS in simulate oil.Used Temperature programmed desorption (TPD) technology to test the acidity of the samples,and the relation between acidity and desulfurization performance.Whereafter,removal of DMS was efficiently carried out by using mental impregnated Y zeolites.It is also used methods such as TPD, XRD,TG/DTG to analyze these samples.The best preparation methods are also found.The Y zeolite is found to be the best adsorbent to remove DMS.In Pyridine-TPD profiles of HY andγ-Al₂O₃,HY,which has more acid sites,showed better desulfurization performance.However,NaY zeolite,which also had good desulfurization performance,has less acid sites than HY.It is considered that the mechanisms on these two Y zeolites are not the same.AgNO₃ showed the best performance in the metal nitrates used to impregnate zeolites.The best desulfurization performance of the sample is prepared as:HY as carrier,0.2g AgNO₃/g carrier,calcined at 300℃.Ag⁺is considered to be the active center for adsorption of DMS.