Oxidative Desulfurization of Dibenzothiophene by Zirconia-Based Catalysts

Abstract

The objective of this study is to report usage of laboratory-prepared zirconia-based samples, normal zirconia (ZD), calcined zirconia at 893 K (ZC) and sulfated and calcined zirconia at 893 K (SZC), as potential catalysts for the oxidative removal of sulfur from model oil (dibenzothiophene in iso-octane). Optimum catalyst doses for all catalysts were found to be 1.0 g/L. The catalytic oxidation of DBT on zirconia samples was found to be a gradual process, and quasi-equilibrium reached in 6 h. Kinetic and thermodynamic parameters have also been calculated.

Mesoporous SnO2–MoO3 catalyst for diesel oxidative desulfurization: Impact of the SnO2/MoO3 ratio on catalytic efficiency

“…On the other hand, upon interactions with the catalyst, in our case SnO 2 –MoO 3 , H 2 O 2 in the ODS processes dissociates into two strong oxidant species: HO − and HO 2 − ions. These are stronger oxidants than O 2 and thus react with DBT to produce DBT sulfone [ [80] , [81] , [82] ]. Scheme 1 shows the mechanism by which DBT is oxidized.…”

Removal of Refractive Sulfur and Aromatic Compounds from Straight-Run, Fluidized Catalytic Cracking, and Coker Gas Oil Using N-Methyl-2-pyrrolidone in Batch and Packed-Bed Extractors

“…The deep removal of sulfur and polyaromatics from gas oil is the need of the hour to minimize the emissions of oxides of sulfur, polyaromatic hydrocarbons (PAHs), and particulate fines, to minimize corrosion and wear of engine systems, and to improve the performance of emission control technologies used for exhaust after treatment systems, which are adversely affected by sulfur poisoning. − Hydrotreatment is the well-established process for removal for sulfur and polyaromatics from gas oil in the refineries.…”

Removal of refractory sulfur and aromatic compounds from straight run gas oil using solvent extraction

“…This leads to serious environmental and health concerns, such as smog, global warming, water pollution, acid rain, cancer and neurotoxicity. [1][2][3][4][5] The quantity of these emissions signicantly depends on the concentration of sulfur, nitrogen and aromatic compounds in the gas oil being used. 5 Environmental regulations have been implemented across the globe to limit the sulfur and aromatic content of gas oil for improving the air quality.…”