Effect of Metal-Containing Anions on the Catalytic Properties of Imidazolium Derivatives Immobilized on Silochrome in Oxidative Desulfurizationстатья
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Дата последнего поиска статьи во внешних источниках: 17 апреля 2024 г.
Аннотация:A comparative analysis is performed for the properties of two Fenton-type catalysts in the oxidationof sulfur-containing compounds with hydrogen peroxide and the desulfurization of crude oil. The catalystsare based on Cu(I) and Fe(III), and Mo(VI) and W(VI) polyoxometalates. Heterogeneous samples are imidazoliumsalts chemically immobilized on surfaces of silochrome and contain the iron and copper chloridecomplexes or phosphomolybdic and phosphotungstic acid anions. Thiophene (T), dibenzothiophene(DBT), methylphenyl sulfide (MPS), and a diesel fraction with an initial amount of sulfur of 1080 ppm areused as model substrates. It is found that the order of reactivity of thiophene substrates depends on the natureof metal-containing anions: thiophene > DBT on the Cu and Fe catalysts and DBT > thiophene on the polyoxometalatecatalysts. This effect is explained using literature data. The catalyst based on phosphotungsticacid allows desulfurization of the diesel fraction of oil to amounts of sulfur of < 10 ppm, which meets today’senvironmental standards.