Deep Desulfurization of Naphtha beyond EURO V Regulation at Ambient Temperature and Pressure

Due to sever international regulations and environmental limitations, the issues of deep desulfurization of fuels becomes more serious [1]. The new requirements for sulfur content in liquid fuels (e.g. EURO V) need the use of novel desulfurization processes. The common processes such as HDS are not effective enough for the elimination of refractory sulfur compounds [2،3]. Mesoporous materials with high surface area as adsorbents are good candidates for deep desulfurization [4]. In this work, a doped mesoporous carbon material with large surface area (CMK-3) was synthesized and its efficiency for the adsorption of dibenzothiophene (DBT) as a refractory sulfur compound was investigated. The synthesis of the host structure CMK-3 was carried out using SBA-3 as the hard template and sucrose as the carbon source [2,5,6]. A series of metal-loaded mesoporous silica and its carbon replica were prepared by incipient wetness impregnation route using appropriate metal salts as precursors. Characterization of synthesized materials was performed by XRD, nitrogen sorption (BET), FT-IR spectroscopy, SEM and TEM. The obtained results showed that ordered hexagonal structure is present in all the synthesized samples. In the next step, desulfurization of naphtha of Tehran oil refinery has been done via several test runs designed by CCD. The effective parameters and their interaction are well investigated using RSM. At metal content of 5 wt%., 25 °C and 90 minutes, the highest desulfurization yield was achieved. The adsorption capacity at this condition was 1.08 mgS/grAds.

کلیدواژه ها:

Deep desulfurization ، Experimental design ، Mesoporous materials ، EURO V