A Mn(iii) polyoxotungstate in the oxidation of organosulfur compounds by H₂O₂ at room temperature: an environmentally safe catalytic approach

Abstract

The tetrabutylammonium (TBA) salt of a Keggin-type polyoxometalate (POM) containing mainly BTs and MF2 containing predominantly DBTs). In both cases the organosulfur compounds from the model fuels were fully converted into the corresponding sulfones. Envisaging developing a promising desulfurization procedure, the extraction of the sulfur compounds from MF2 was attempted after the catalytic oxidation process. More than 98 mol % was removed using an ethanol/H 2 O mixture.

A μ-AsO4-Bridging Hexadecanuclear Ni-Substituted Polyoxotungstate

“…The catalytic oxidation of sulfides has attracted widespread and lasting attention, as the oxidation products sulfones or sulfoxides have multiple applications in many organic reactions. , POMs have presented good catalytic activities for the oxidation of sulfides due to their unique characteristics such as multiple active sites, redox properties, high stability, etc. − Additionally, the rational selection of oxidants is also crucial in the catalytic oxidation process; H 2 O 2 is considered to be a “green oxidant” and is widely favored. , Additionally, it is generally believed that the combination of H 2 O 2 and POMs can form a peroxygen active intermediate, thereby accelerating the oxidation reaction. , Herein, we explored the performance of 1 as a heterogeneous catalyst in the acetonitrile solvent using H 2 O 2 as an oxidant to catalyze the oxidation of various sulfides. The conversion rate of the sulfides and the selectivity of the catalytic products, sulfoxides and sulfones, were examined by GC (Figure S10).…”

Zr‐Metal‐Organic Framework Catalysts for Oxidative Desulfurization and Their Improvement by Postsynthetic Ligand Exchange

“…Hence, ODS enables the efficient removal of DBT and its derivatives under mild conditions . To date, various (homogeneous) reactants or catalysts have been applied in ODS processes, such as peroxyorganic acids, Bronsted acidic ionic liquids, and particularly, polyoxometalates (POMs) . However, recovery of POMs from the liquid mixtures is difficult, which limits their application in industrial ODS processes .…”

A POM-based porous supramolecular framework for efficient sulfide–sulfoxide transformations with a low molar O/S ratio

“…[14][15][16][17][18] Among them, many POM-based catalytic systems for oxidizing sulfides have been successfully established over the past dozen years. [19][20][21] Examples that have easily come to conception are the selective oxidation of a variety of thioethers and degradation of sulfur mustard gas simulants (2- [22][23][24][25] In recent years, increasingly more research has been gradually focused on the construction of POM-based heterogeneous catalysts. Immobilizing POMs on proper supports (e.g., MOFs, COFs, high surface area carbon, mesoporous silica and metal oxides) has been widely employed to achieve the heterogeneity of POMs.…”

“…19–21 Examples that have easily come to conception are the selective oxidation of a variety of thioethers and degradation of sulfur mustard gas simulants (2-chloroethyl ethyl sulfide, CEES) catalyzed by inorganic POMs such as TBA 4 [α-Mo 8 O 26 ], TBA 12 H 13 PNb 12 O 40 (V V O) 2 (V 4 IV O 12 ) 2 , TBA 4 H 2 [BW 11 Mn(H 2 O)O 39 ], and TBA 8 [(γ-SiW 10 Ti 2 O 38 (OH) 2 ) 2 ] under homogeneous conditions. 22–25 In recent years, increasingly more research has been gradually focused on the construction of POM-based heterogeneous catalysts. Immobilizing POMs on proper supports ( e.g.…”