Titanium-Modified MIL-101(Cr) Derived Titanium-Chromium-Oxide as Highly Efficient Oxidative Desulfurization Catalyst

Abstract

A titanium-chromium-oxide catalyst was prepared by a facile calcination of titanium-modified MIL-101(Cr). The resulting material, possessing a surface area of 60 m2 g−1 and a titania content of 50.0 wt%, can be directly used as the catalyst for oxidative desulfurization (ODS) reaction of dibenzothiophene (DBT). This novel ODS catalyst can remove 900 ppm sulfur-containing compounds in a reaction time of 30 min at 60 °C. The experimental results showed that the specific activity increased with the titanium content. The specific activity of the catalyst with 50%Ti reached 129 μmol/m2, which was much higher than that of reported Ti-based catalysts.

A current overview of the oxidative desulfurization of fuels utilizing heat and solar light: from materials design to catalysis for clean energy

“…). Therefore, the removal of ligands from the structure of MOFs is essential and efficacious for achieving ultradeep ODS via increasing the number of open boundaries and defect sites for the adsorption and oxidation of reactants.Li et al modified Cr-based MOF MIL-101 with Ti via IWI and calcination method to increase the catalytic sites of MIL-101 191. …”

Assessment of Reaction Parameters in the Oxidative Desulfurization Reaction

“…67,84 MOFs, such as MIL-125(Ti) and MIL-101(Cr), have been extensively studied for their potential to encapsulate polyoxometalates as catalysts in the ODS process. 85,86 In recent studies, researchers have investigated the use of a highly stable zirconium-based MOF (NU-1000) for the ODS process. NU-1000 has a unique structure characterized by eight connected secondary building units, which provide abundant −OH groups on the Zr 6 clusters.…”

“…Metal–organic frameworks (MOFs) have crystalline porous structures, consisting of polynuclear metal clusters joined together by organic ligand linkers, which can be ideal catalysts. To date, numerous studies have reported on the potential for MOF-based or MOF-derived catalysts to be used for ODS with impressive efficiency. , MOFs, such as MIL-125­(Ti) and MIL-101­(Cr), have been extensively studied for their potential to encapsulate polyoxometalates as catalysts in the ODS process. , In recent studies, researchers have investigated the use of a highly stable zirconium-based MOF (NU-1000) for the ODS process. NU-1000 has a unique structure characterized by eight connected secondary building units, which provide abundant −OH groups on the Zr 6 clusters.…”

Advances in Oxidative Desulfurization of Fuel Oils over MOFs-Based Heterogeneous Catalysts

“…The pyrolysis of MOF loaded with Ti precursor inside the pore can obtain smaller TiO 2 particles and higher porosity than those loaded outside the pore, which will lead to superior catalytic activity. In addition, a chromium-titanium oxide hybrid nanocomposite was also reported, which was obtained by the pyrolysis of Ti-modified MIL-101(Cr) [116]. When CHP was used as oxidant, the removal of DBT (1000 ppm) in model oil could reach 90% within 30 min.…”