Abstract: SiO2-TiO2-ZrO2 complex support was prepared by coprecipitation method. The kinetics of thiophene hydrodesulfurization (HDS) over MoP/ SiO2-TiO2-ZrO2 catalyst were investigated by a fixed micro-reactor under the conditions of hydrogen partial pressure of 2~5 MPa, reaction temperature of 320~340℃, hydrogen/oil volume ratio of 500~800 and LHSV of 2~8 h-1. The results showed that the conversion of thiophene increased with the increase of reaction temperature and hydrogen partial pressure; it decreased with the increase of hydrogen/oil volume ratio and LHSV. Experimental data were fitted by pseudo-first-order and pseudo-second-order kinetic models respectively, and using Levenberg-Marquardt (LM) method the parameters of the kinetic models were developed. A comparison of the HDS conversion of thiophene between experimental data and values calculated by kinetic models was carried out. It was shown that the calculated values by pseudo-first-order kinetic model were in better agreement with the experimental data.

Key words: thiophene, hydrodesulfurization, kinetics