Catalytic adsorptive desulfurization of model diesel fuel using TiO2/SBA-15 under mild conditions

Dynamic catalytic adsorptive desulfurization of real diesel over ultra‐stable and low‐cost silica gel‐supported TiO2

“…Notably, DBT and its alkylated derivatives are the major sulfur species in low‐sulfur diesel (after fair hydrotreating). Taking advantages of the high efficiency of ODS of DBTs under mild conditions, and the great effectiveness of ADS for contaminant removal at low concentration under ambient conditions, we reported coupled oxidation‐adsorption process in one step . In such process, organosulfur in model diesel was first converted to sulfoxides or sulfones, followed by selective adsorption of sulfoxides or sulfones over the same adsorbent.…”

Mesoporous TiO2–SiO2 adsorbent for ultra-deep desulfurization of organic-S at room temperature and atmospheric pressure

“…The most commonly-used adsorbents include activated carbons, [19][20][21] zeolites, [22][23][24] ionic liquids, [25][26][27] metal oxides [28][29][30] and other mesoporous materials. 31 Bazyari et al 32 investigated the TiO 2 -SiO 2 nanocomposite catalyst-adsorbents. This catalyst with 50 wt% TiO 2 (TS-50) exhibited the highest ODS activity, achieving more than 98% sulfur removal for less than 10 ppm sulfur in model fuel (2875 ppm DBT in isooctane) in 20 min.…”

Regeneration of AgXO@SBA-15 for reactive adsorptive desulfurization of fuel

“…Intended to further remove adsorbed species, i.e., sulfoxides/sulfones, thiophenic compounds, fuel compositions, residue of the polar solvent of acetonitrile on the spent Ag X O@SBA-15, the adsorbent was regenerated by an acetonitrile wash followed with oxidative air treatment (Ren et al 2016;Miao et al 2015). Figure 2 shows the desulfurization uptakes of the 15% Ag X O@SBA-15 in 4 consecutive RADS-regeneration cycles.…”

“…However, HDS achieves less efficiency in the removal of heterocyclic S-compounds such as benzothiophene (BT), dibenzothiophene (DBT) and their derivatives (González et al 2016). Therefore, developing alternative non-hydrotreating approaches which could be used under ambient conditions and without high hydrogen consumption for effective ultra-deep desulfurization has attracted much interest (Miao et al 2016;Sévignon et al 2005).…”

“…The adsorbents served bifunctionally as an oxidation catalyst for thiophenes and as a selective adsorbent for sulfoxides/sulfones. Ren et al (2016) investigated CADS of model diesel using TiO 2 /SBA-15 under mild conditions, and high desulfurization capacity of 12.7 mg-S/g was achieved even at a low sulfur concentration of 15 ppmw-S. The CADS-TiO 2 /SBA-15 mechanism involved the oxidation of DBT to DBTO 2 by cumene hydroperoxide and the simultaneous adsorption of DBTO 2 by TiO 2 /SBA-15.…”