Adsorptive desulfurization on a heteroatoms Y zeolite prepared by secondary synthesis

Abstract

Gallium atoms have been introduced into the framework of Y zeolite by treating the zeolite with an aqueous solution of ammonium hexafluoro gallate. Desulfurization of various model fuels containing about 500 μg/g sulfur has been studied over the synthesized Y zeolite ([Ga]AlY). The sulfur adsorption capacity is 7.0, 17.4, 14.5, 16.9, 6.9 and 5.8 mg(S)/g adsorbent for thiophene, tetrahydrothiophene (THT), 4,6-dimethyldibenzothiophene (4,6-DMDBT), dibenzophiophene (DBT), benzothiophene (BT) and 4-methyldibenzothiophene (4-MDBT), respectively. The charges on the S atom in thiophene, THT, 4,6-DMDBT, DBT, BT and 4-MDBT, calculated using the density functional theory (DFT), are −0.159, −0.298, −0.214, −0.211, −0.193 and −0.188, respectively, implying that the S-M bond between the adsorption sites and thiophene is much weaker than that between the adsorption sites and THT, 4,6-DMDBT or DBT. The sulfur removal of FCC gasoline on [Ga]AlY is 68%.isomorphous substitution, DFT, model fuels, adsorptive desulfurization

The selectivity for sulfur removal from oils: An insight from conceptual density functional theory

“…The commonly used sorbents for ADS are Cu or Ag based zeolites . The selectivity in ADS typically decreases in the order: 4,6‐DMDBT > DBT > BT > 2‐MTH > TH (Table ).…”

“…Recent years, tremendous works focused on the deep removal of aromatic sulfur compounds by various methods. Those methods are adsorptive desulfurization (ADS), extractive desulfurization (EDS), and oxidative desulfurization (ODS) . For sulfur removal techniques, selectivity for different sulfides is a vitally important topic.…”

“…Generally, the selectivity for sulfur removal is largely depended on the removal mechanism for a given method. In ADS system, the removal mechanism is suggested to be the π‐π interaction between sulfides and sorbents . While in EDS system, the mechanisms were mainly ascribed to hydrogen bond and π‐π interactions as well as CH‐π interactions .…”

Removal of sulphur from model gasoline by CuAgY zeolite: equilibrium, thermodynamics and kinetics

“…So far, various adsorbents have been studied for adsorption desulphurization such as metal-organic frameworks (MOFs), 17 magnetic alumina, 18 active carbon (AC), 19,20 clay materials, 21 metal oxides, 22 and zeolite-based materials. [13][14][15][16][23][24][25][26][27][28][29][30][31][32][33] Y zeolites have been extensively studied due to the large surface area, suitable pore size and thermal stability. The studied Y-based materials included synthesized zeolite ([Ga]AlY), 25 single metal modied zeolites (AgY, Cu(I)Y, NiY, ZnY, CeY, PdY), [26][27][28] and bimetal modied zeolites (Cu I Ce IV Y, AgCeY, CuZnY, NiCeY).…”

A Study on the Oxidation-extraction Desulfurization of FCC Gasoline Over Supported Phosphotungstic Acid/H2O2/Dimethyl Sulfoxide (DMSO)

“…However, HDS is difficult to remove polyaromatic sulfur compounds, such as benzothiophene (BT), dibenzothiophene (DBT), and their derivatives, owing to their steric hindrance and stronger C-S bond energy, which make them difficult to broken down by hydro treatment (Zhao et al, 2006). To overcome the limitations of HDS, several new approaches such as oxidation desulfurization (ODS; Instituto et al, 2004), adsorption desulfurization (Tang et al, 2010), and extraction desulfurization (Li et al, 2009) have been studied in recent years. Among those methods, oxidative desulfurization combined with extraction has been paid more and more attention due to its mild reaction conditions and high sulfur removal.…”