It is usually difficult to remove dibenzothiophenes from diesel fuels by oxidation with molecular oxygen as an oxidant. In the study, tungsten oxide was supported on magnetic mesoporous silica by calcination to form a magnetically separable catalyst for oxidative desulfurization of diesel fuel. By tuning different calcining temperatures, the catalyst calcined at 500 °C showed a high catalytic activity with molecular oxygen as the oxidant. Under optimal reaction conditions, the sulfur removal of DBT reached 99.9% at 120 °C after 8 h. Furthermore, the removals of 4-methyldibenzothiophene and 4,6-dimethyldibenzothiophene could also get up to 98.2% and 92.3% under the same conditions. The reaction mechanism was explored by selective quenching experiments and FT-IR spectra.

中文翻译：

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磁性介孔二氧化硅负载的氧化钨催化剂的好氧氧化脱硫

用分子氧作为氧化剂氧化通常很难从柴油中除去二苯并噻吩。在研究中，通过煅烧将氧化钨负载在磁性介孔二氧化硅上，形成用于柴油的氧化脱硫的磁性可分离催化剂。通过调节不同的煅烧温度，在500°C下煅烧的催化剂以分子氧为氧化剂表现出较高的催化活性。在最佳反应条件下，8 h后，在120°C下DBT的脱硫率达到99.9％。此外，在相同条件下，4-甲基二苯并噻吩和4,6-二甲基二苯并噻吩的去除率也可分别达到98.2％和92.3％。通过选择性猝灭实验和FT-IR光谱探索了反应机理。