Abstract: The difficulty of catalytic oxidative desulfurization in petroleum products is the removal of thiophene sulfur, but there are few studies on the effect of the composition of petroleum hydrocarbons on the oxidation reaction depth of thiophene. Using different hydrocarbons and alcohols as solvent, H₂O₂ as oxidant, and titanium-silicon molecular sieve (TS-1, TS-1-D) as catalyst, the oxidation of thiophene in solvent molecules with different alkyl groups was studied. The results showed that the structure of alkyl group in the solvent was an important factor affecting the oxidation degree of thiophene under the same reaction conditions. The higher the isomerization degree of alkyl group in the solvent, the greater the oxidation degree of thiophene.

Key words: hydrocarbon group isomerization, titanium-silicon molecular sieve, thiophene, catalytic oxidation