Design and Synthesis of Amphiphilic Catalyst [C₁₆mim]₅VW₁₂O₄₀Br and Its Application in Deep Desulfurization with Superior Cyclability at Room Temperature

Abstract

Achieving long-term stable deep desulfurization at room temperature and recovering high value-added sulfone products is a challenge at present. Herein, a series of catalysts [C n mim] 5 VW 12 O 40 Br (C n VW 12 , 1-alkyl-3-methylimidazolium bromide tungstovanadate, n = 4, 8, 16) were presented for the room temperature catalytic oxidation of dibenzothiophene (DBT) and its derivatives. Factors affecting the reaction process, such as the amount of catalyst, oxidant, and temperature, were systematically discussed. C 16 VW 12 showed higher catalytic performance, and 100% conversion and selectivity could be achieved in 50 min with only 10 mg. The mechanism study showed that the hydroxyl radical was the active radical in the reaction. Benefiting from the "polarity strategy", the sulfone product accumulated after 23 cycles in a C 16 VW 12 system, and the yield and purity were about 84% and 100%, respectively.

Amphiphilic Catalysts Comprising Phosphomolybdic Acid Fastened on MIL-101(Cr): Enabling Efficient Oxidative Desulfurization under Solvent-Free and Moderate Reaction Conditions

“…In Figure , for solid POM-IL (line E), the stretching vibrations of −CH 2 – and −CH 3 on the sample cation are observed in the 2800 to 3000 cm –1 scope. − The imidazole-based POM-IL used in this work also exhibits several characteristic peaks (874, 962, and 1065 cm –1 ) associated with a Keggin-type phosphomolybdic acid anion, relating to the bonds of Mo–O b –Mo, MoO, and P–O, respectively. The characteristic peaks for both the cation and anion of POM-IL could be viewed for the supported catalysts (lines B–D), implying that the configuration of phosphomolybdate anions remains relatively stable while synthesizing. , For pristine MIL-101 (line A), the absorption peaks around 1623 and 1387 cm –1 correspond to the symmetric stretching vibration ( v ) and the asymmetric stretching vibration ( v as ) of the carboxyl group, respectively.…”

Boosting Catalytic Oxidative Desulfurization Performance over Yolk–Shell Nickel Molybdate Fabricated by Defect Engineering

“…The characteristic peak corresponding to DBT ( m / z = 184) keeps decreasing as the reaction proceeds, and it completely disappears after the ODS reaction, inflecting that DBT is successfully converted and removed from the model oil. Meanwhile, no signal peak of the oxidative products dibenzothiophene sulfone (DBTO 2 ) is detected in the oil phase after reacting for 70 min ( m / z = 216), illustrating that they may be retained in the [OMIM]­BF 4 phase with strong solubility. To further confirm the above hypothesis, the obtained used catalyst is extracted by carbon tetrachloride (CCl 4 ) through a simple washing.…”

Assembly of Lanthanide-Containing 3D [MnMo9O32]6–-Based Metal–Organic Frameworks and Oxidative Desulfurization Performance

“…As we know, the thioethers are a kind of sulfur-containing impurity in industrial crude oil, which are harmful to the environment and human health. , Therefore, the oxidation of thioethers to intermediates sulfoxides is of significance for their wide application in the synthesis of biological and pharmaceutical compounds, chemicals, etc. − Herein, a number of thioethers are selected as substrates to explore the optimal conditions for oxidative desulfurization using compounds 1 – 3 as catalysts.…”