WOx/TiO2 catalysts were synthesized by impregnating aqueous (NH4)2WO4 on hydrous titania nanotubes. The materials annealed in air at 500 °C and characterized X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), high-angle annular dark-field scanning (HAADF-STEM), photoelectron spectroscopy (XPS); their catalytic activity was evaluated the oxidation reaction of dibenzothiophene (DBT). After annealing °C, structure support transformed from...

Adsorptive desulfurization was studied using diesel fuel with low sulfur content (72 ppmw) and four commercial activated carbons (CAA, CAB, CAC, CAD). After the adsorption scheme, it possible to obtain a 15 ppmw of content. The experiments were carried out in batch system at 303.15 K, atmospheric pressure, 5−200 g-A/L-D, magnetic stirring over 18 h. isotherms correlated by Freundlich, Langmuir, Sips Brunauer−Emmett−Teller (BET) models. There good agreement between experimental calculated...

Transition to a new energy low carbon pool requires the gradual replacing of fossil fuels with other cleaner energies and biofuels. In this work, environmental impact renewable diesel production using an attributional life cycle assessment was evaluated by considering five stages: palm plantation-culture-harvest, oil extraction, refining, green (renewable) production, biofuel use. The functional unit established as 1.6 × 10 −2 m 3 (13.13 kg) diesel. results show that Hydro-processed Esters...

In this work a study of dibenzothiophene removal by an oxidation−extraction scheme is presented. Experiments were carried out to observe the role that solvent plays during process, as well oxidizing agent and catalyst. The oxidation was with hydrogen peroxide in presence catalyst tungsten supported on zirconia (WOx−ZrO2). A + n-hexadecane model mixture employed simulate diesel fuel. Methanol, ethanol, acetonitrile, γ-butyrolactone used extraction solvents. Dibenzothiophene (DBT) removed more...

Abstract In this work, we studied the desulfurization of Straight Run Gas Oil (SRGO) and diesel by selective oxidation extraction sulfur-containing compounds. The was carried out with a mixture hydrogen peroxide at 30 wt% acetic acid as catalyst. corresponding sulfones performed polar solvents (e.g., acetonitrile, methanol, 2-ethoxyethanol, γ-butyrolactone). SRGO has sulfur content 13,985 ppmw while 390 ppmw, results showed removal to levels low 92 for diesel. From consideration above...

This work reports the solid−liquid equilibria of several binary systems formed by solvent (1) + dibenzothiophene (2) and sulfone (2). At least six experimental points were obtained to trace equilibrium curve, using visual technique determine change phase. The data at atmospheric pressure from a (280 353) K temperature range. uncertainties ± 0.0005 in mole fraction 0.5 temperature, respectively. A classical equation was used derive activity coefficient solubility data. following solution...

We performed a computational study on the interaction of O-containing compounds coming from biomass with catalytic surface MoO3. The addition H atoms metal oxide mimics different scenarios its exposure to ambient or protons biomass. Representative fatty acids (from triacylglycerides) and aromatics lignin) were adsorbed surfaces. covered complete coverage, molecules showed structural changes due interactions in turn. driven force this process is hydrogen bonding, which reveals complexity...

A series of Mo-based catalysts were synthesized by tuning the sulfidation temperature to produce mixtures MoO3 and MoS2 as active phases for hydrodeoxygenation (HDO) palmitic acid. Differences in oxidation states Mo, chemical species present catalytic materials determined spectroscopic techniques. Palmitic acid was used a fatty-acid model compound test performance these catalysts. The related different formed within materials. Sulfidation otherwise inactive significantly increased their...

Abstract We studied the most commonly S‐containing compounds present in crude oils, so‐called 4,6‐dialkyldibenzothiophenes. The alkyl derivatives this study were methyl, ethyl and isopropyl. Computationally rotating substituents, we found differences their stability. stable compound (isopropyl) was transformed into instable by changes its structure. Aromaticity revealed taking place upon structural modifications. refractory (isopropyl derivative) reduced much more aromatic character than...