Continuous Flow Desulfurization of a Model Fuel Catalysed by Titanium Functionalized UiO‐66

Abstract

The porous material UiO‐66 is one of the most stable MOFs, retaining its properties under a relatively wide range of chemical and physical conditions, making it attractive for post‐synthetic modifications and catalytic applications. A Titanium functionalization of UiO‐66 has been carried out and the synthesized material has been efficiently used as catalyst in the continuous oxidative desulfurization of a model fuel with aqueous H2O2. Using dibenzothiophene as sulfur source, only a partial desulfurization has been achieved, nevertheless the functionalized MOF showed better performances compared to the standard UiO‐66. The titanium containing MOF allowed to completely removing thioanisole from the oil phase within only eight minutes. The pore sizes of UiO‐66 are playing an important role in allowing a fast oxidation of the thioanisole compared to dibenzothiophene.

Metal‐Organic Framework‐Based Catalysts for Oxidative Desulfurization

“…Aiming to avoid this inconvenience, the use of TiO(acac) 2 in anhydrous MeOH to form active Zr‐OTi iv species via replacing hydrogen atoms of the Zr‐OH (rather than replacing Zr metal of UiO‐66(Zr) with Ti metal) has been investigated . Yet, a defect‐free material with reduced pore volume did not allow a satisfactory removal of large DBT both in batch (up to 75 ppm from 1000 ppm) and continuous flow (up to 276 ppm from 1000 ppm).…”

Oxidation Adsorptive Desulfurization of Jet Fuel Using Mesoporous Sieve Loaded with TiO2

“…The following step was the adsorption of the more polar DBTO 2 onto TiO 2 /MCM-41. [3] Excess TiO 2 would reduce the surface area (S BET ) and block the pores of MCM-41 (Table 1), and thereby influence the DBTO 2 adsorption site (which might be excessively acidic). Among catalysts prepared using SBA-15 as the support, the maximum adsorption capacity was found for 5 % TiO 2 /SBA-15.…”

“…Because thiophene sulfide accounts for more than 85 % of the total sulfide in fuel, its removal is key to realising ultra-low-sulfur or even sulfur-free clean fuel. [3][4][5][6][7] Hydrodesulfurization (HDS) is widely employed to reduce the sulfur content of jet fuel. [8] However, because of the stable conjugated structure between the lone pair electrons on the sulfur atom and the π electrons on the thiophene ring, the thermal stability of the compound is high and the HDS process is inefficient.…”

Supported Metal Nanoparticles in Metal‐Organic Monoliths for Assembly of a Catalytic Microfluidic Reactor

“…[6] Additionally the lack of mechanical stirring or agitation avoids mechanical degradation of heterogeneous catalysts in a flow mode. Various catalytic porous materials have been investigated in microfluidic/flow reactors such as MOFs (e. g., HKUST-1, [7,8] ZIF-series, [9] MIL-series, [10] and UiO-66 [11,12] ), silica monolith, [13][14][15] polymers [16,17] and others. [18] Monoliths possess uniform structure composed of interconnected channels.…”