Abstract
A mesoporous silica-supported molybdenum oxide catalyst with a cerium(Ce) modifier was prepared by in situ synthesis and used in a hydrogen peroxide (H2O2) system for the desulfurization of dibenzothiophene (DBT), benzothiophene (BT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT) fuel oils. The catalytic performance of the catalyst was studied. The catalyst was characterized by Fourier Transform Infra-Red (FT-IR), X-ray diffraction (XRD), Brunner−Emmet−Teller (BET), and X-ray Photoelectron Spectroscopy (XPS). The influences of m(catalyst)/m(fuel oil), v(H2O2)/v(fuel oil), reaction temperature, and reaction time were investigated. The catalyst had excellent catalytic oxidation desulfurization performance under moderate operational conditions. The catalytic performance was in the order DBT > 4,6-DMDBT > BT. The kinetic analysis results showed that the reaction was a pseudo first-order kinetics process and the apparent activation energies of DBT, BT, and 4,6-DMDBT were 46.67 kJ/mol, 56.23 kJ/mol, and 55.54 kJ/mol, respectively. The reaction products of DBT, BT, and 4,6-DMDBT were DBTO2, BTO2, and 4,6-DMDBTO2, respectively. The recycling experiments indicated that DBT, BT, and 4,6-DMDBT removal could still reach levels of 94.0%, 63.0%, and 77.9% after five cycles.
Highlights
Standards related to fuel oils containing sulfur have become more stringent, and various countries are working hard to achieve almost no sulfur in their petrochemical products and fuel oil [1]
Oxidative desulfurization has received wide application owing to moderate operational conditions and superior selectivity in removing aromatic sulfur compounds in contrast with HDS, without the need for expensive hydrogen [11]
The oxidative desulfurization process is divided into two stages
Summary
Standards related to fuel oils containing sulfur have become more stringent, and various countries are working hard to achieve almost no sulfur in their petrochemical products and fuel oil [1]. Catalyst corrosion and deactivation can be caused by these compounds in the desulfurization procedure [4]. For this reason, the ultra-deep desulfurization of fuel oil is an essential part of the refining industry [5]. Hydrodesulfurization (HDS) is the existing primary traditional and widely used desulfurization process [6]. Oxidative desulfurization has received wide application owing to moderate operational conditions and superior selectivity in removing aromatic sulfur compounds in contrast with HDS, without the need for expensive hydrogen [11]. The sulfur-containing compounds are oxidized to sulfones in the existence of an oxidizer [12] These sulfones in the mixture are gotten rid of through adsorption
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