Hydrodesulfuization of benzothiophene has been investigated over a Ni-Mo/gamma-Al2O3 catalyst. Kinetic data were taken in a now microreactor system at temperatures of 180 to 260 degrees C and 2.0 MPa hydrogen pressure, at various weight hourly space time. From the data, kinetic midel after Langmuir-Hinshelwood relationship kinetics were developed to predict the rate of disappearance of benzothiophene and that for formation of the dihydrobenzothiophene as a intermediate product.