Adsorptive desulfurization of diesel with mesoporous aluminosilicates

Abstract

Mesoporous aluminosilicates (MAS) bearing microporous zeolite units and mesoporous structureswere synthesized by the hydrothermal method. Adsorptive desulfurization ability of model oil and hydrotreated diesel was studied. The effects of template concentration, crystalization time and calcination time were investigated. The desulfurization ability of adsorbents was improved by transitional metal ion-exchanging. The adsorptive desulfurization of diesel was carried out on a fixed-bed system. The results show that the adsorptive capacity is MAS>MCM-41>NaY. The improvement of desulfurization ability of MAS by Cu + is more significant than that of Ag + .

Influence of the Chemical Composition of Silica–Alumina Adsorbents in Sulfur and Nitrogen Compounds Removal from Hydrotreated Diesel

“…Postsynthesis modifications have been carried out by grafting aluminum to the silica wall, aiming at increasing the acidity, but the stability problem was not solved . Mesoporous aluminosilicates synthesized by a hydrothermal method using NaY zeolite as precursor were studied by Li et al and Tang et al to remove sulfur compounds from model and hydrotreated diesel. These materials have shown a better performance than MCM-41 and NaY.…”

Desulfurization of Liquid Hydrocarbon Fuels with Microporous and Mesoporous Materials: Metal-Organic Frameworks, Zeolites, and Mesoporous Silicas

“…The Si/Al ratio was found to influence the acidity of MWW zeolites, leading to a change in performance. The highest adsorption capacity of 12.22 mg S/g was achieved on MWW (21). The performance of each Si/Al ratio decreased in the following order: MWW (21) > MWW (30) ≈ MWW (9) > MWW (46).…”

“…A myriad of adsorbents have been demonstrated to selectively adsorb sulfur compounds. − The scientific community have examined a wide variety of adsorbents and there is a need to track this progress. In addition, a complete fundamental understanding of these sorbents and the mechanisms by which they selectively adsorb sulfur has yet to be achieved.…”

Deep Oxidative Desulfurization of Thiophenic Model Oil/Natural Gas Condensate Over Tungsten/Molybdenum Oxides Using H2O2 as Oxidant

“…Hydrodesulfurization (HDS) is the most widely used technology for desulfurization of diesel fuel, which is highly effective for removing aliphatic and acyclic S‐compounds (thiols, sulfides, and disulfides) and less effective for removing the refractory S‐compounds such as benzothiophene (BT), dibenzothiophene (DBT) and their alkyl derivatives in the presence of a Ni/Mo or Co/Mo catalyst 3,4. In this process, hydrogen gas is used to remove S‐compounds due to formation of hydrocarbons and H 2 S. In addition, due to large amount of hydrogen consumption, high temperature (> 300 °C), high pressure (3–10 MPa) and larger reactor volume, several alternate desulfurization processes has been used for producing clean fuels such as adsorption,5 extraction,6 ODS,7 and biodesulfurization 8. Among them, the ODS process combined with extraction proposed as the better alternative way compared with HDS process due to high electron density on thiophenic compounds, ambient pressure (1–2 atm), relative low temperature (40–100 °C), and high selectivity which consumes no hydrogen 9.…”