Catalysts Based on Immobilized Ionic Liquids with Brønsted Acid Sites in the Oxidation of Dibenzothiopheneстатья
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Дата последнего поиска статьи во внешних источниках: 12 января 2022 г.
Аннотация:Immobilized ionic liquids with Brønsted acidity containing fragments of nicotinic and phosphomolybdic acids are synthesized by two methods: suspension impregnation and chemical immobilization. The obtained catalysts are characterized by the low-temperature adsorption/desorption of nitrogen, elemental analysis, and transmission electron microscopy. The conditions for exhaustive oxidation of dibeznothiophene are determined: 30 min, the molar ratio of hydrogen peroxide and dibenzothiophene = 6 : 1, the weight fraction of catalyst = 0.5 wt %, and T = 80°C. The catalysts obtained by impregnation lose their activity after regeneration and the catalysts obtained by chemical immobilization retain their activity after at least five oxidation/regeneration cycles.