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Diesel fuel is a complex mixture containing a large variety of sulphur compounds with different reactivity.Clear understanding reactivity of different types of sulphur compound is very important in definition of their reaction kinetic. This knowledge is significant to achieve ultra deep hydrodesulphurized diesel fuels. Diesel fuels contain a large number of individual sulphur substances which can be divided into two groups. The first group includes benzothiophenes (BTs) with alkyl substituents containing 1 – 7 carbon atoms, and the second group comprises dibenzothiophenes (DBTs) with alkyl substituents containing 1 – 5 carbon atoms. Several studies have shown that the relative reactivity of different thiophenic sulphur compounds is significantly different, as might be expected1,2 . Benzothiophenes and their derivates are usually desulphurized at higher reaction rate than DBT and alkylated DBTs. Alkylated dibenzothiophene isomers containing alkyl groups close to the sulphur atom (e.g. 4MDBT, 4,6-DMDBT, 4,6-DEDBT) are less reactive and more difficult to hydrodesulfurize. The aim of this work was to determine kinetics of HDS catalytic process and mainly the differences in reaction rates.