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论文类型：期刊论文

发表时间：2007-05-01

发表刊物：ENERGY & FUELS

收录刊物：SCIE、EI

卷号：21

期号：3

页面范围：1415-1419

ISSN号：0887-0624

摘要：Oxidative desulphurization of 4,6-dimethyldibenzothiophene (DMDBT) in octane has been investigated with hydrogen peroxide (H2O2) over Ti-HMS under mild conditions. Among the several Ti-containing catalysts, Ti-HMS exhibits high catalytic activity for the oxidation of DMDBT. The effects of the amount of the Ti-HMS catalyst, the mole ratio of H2O2 and the S-containing molecule (H2O2/S), the concentration of DMDBT, and the temperature on the reaction rate were investigated. The reaction rate of the oxidative desulphurization was promoted with the increase of the amount of the catalyst, the H2O2/S mole ratio, the concentration of DMDBT, as well as the temperature. The Arrhenius apparent activity energy of the oxidative reaction of DMDBT with H2O2 over Ti-HMS was determined as 38.54 kJ mol(-1). The reaction system H2O2/Ti-HMS shows a high intrinsic catalytic activity for sulfur-containing compounds present in diesel in the following order: DMDBT < benzothiophene (BT) < dibenzothiophene (DBT). BT and DBT can be completely converted into their corresponding sulfoxides and sulfones in 3 h. The removal of DMDBT can be achieved by nearly 90%, and as a result, the sulfur level of a model fuel can be lowered from 226.1 to 22.9 ppm with a H2O2/S mole ratio of 4:1 at 333 K.