With Ti-HMS as the catalyst and with H_2O_2 as the oxidant, the oxidative desulfurization (ODS) of thiophene (Th), benzothiophene(BT), dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (DMDBT) in a model fuel was studied. The ODS reactivity of these compounds over Ti-HMS was measured and the effects of SiO_2/TiO_2 ratio and crystallinity of Ti-HMS on the sulfur removal were investigated. The order of ODS reactivity over Ti-HMS was as follows: DBT>BT>DMDBT>Th, which was determined by the electron dens...