Catalytic performance of vanadium-substituted molybdophosphoric acid supported on zirconium modified mesoporous silica in oxidative desulfurization

Synthesis of new nanocomposite based on nanoceramic and mono substituted polyoxometalate, PMo11Cd@MnFe2O4, with superior catalytic activity for oxidative desulfurization of real fuel

“…In order to investigate the influence of temperature on the CODS process yields, series of kinetic calculations were carried out using the pseudo-first-order kinetic model (equation 9) and Arrhenius equation (equation 10). According to the literature, [40][41][42][43] in the CODS process, the per-oxo form of catalyst must be firstly created by oxidant that therefore leads to two separate reactions for complete oxidizing sulfur compounds: (i) in a reversible condition, the per-oxo form of the catalyst adsorbs the sulfur compound (specially DBT in this experiment). Next, (ii) the adsorbed DBT turns to DBT-sulfoxide (DBTO) via surface reaction of the catalyst.…”

Molybdenum anchored on NH2‐modified spherical SiO2: A highly efficient and stable catalyst for oxidative desulfurization of fuel oil

“…A comparison between FT‐IR spectra of the spent Mo/SiO 2 and Mo‐NH 2 ‐SiO 2 catalysts is shown in Figure . For the spent Mo/SiO 2 catalyst, there are two different characteristic peaks at 1288 and 1166 cm −1 , which can be assigned to the asymmetric and symmetric stretching vibration of S═O (DBTO 2 ), respectively, which are absent in the spectrum of the Mo‐NH 2 ‐SiO 2 catalyst. This result was attributed to the DBTO 2 adsorbed on the surface of the Mo/SiO 2 catalyst, thus resulting in the reduced catalytic activity.…”

Sulfur compounds reactivity in the ODS of model and real feeds on W–SBA based catalysts

“…The solution to be desulfurized was rst loaded in the reactor and heated to 75 C. Catalyst and oxidant (tert-butyl hydroperoxide, TBHP) were added simultaneously to the reaction mixture under stirring at 700 rpm, the ratios mass(catalyst)/mass(solution) being set at 0.01 and 0.02 and the oxidant/S ratio at 2.3 and 25 for model and real charges, respectively. Indeed O/S ratios only slightly higher than the stoichiometric one (equal to 2) are required in the ODS of model fuels [22][23][24][25] while much larger values (above 15) are reported in the literature when real feeds are treated. 6,18 These high values are justied by possible secondary oxidation reactions of aromatics or nitrogen compounds present in these feeds.…”