(509at) Kinetic Modeling of Hydrodesulfuration of Dibenzothiophene with Ni-Mo-W Catalysts Supported on Aluminum-Titanium Mixed Oxides

Due to the increasing demands concerning environmental issues, the oil industry is under pressure to provide fuels with less pollutants content. Therefore, the attention is focused on hydrotreating (HDT), because in this process the organic compounds containing sulfur, oxygen, nitrogen or heavy metals are catalytically removed in presence of hydrogen. However, actual catalysts do not fulfil the new demands, especially if crude with high sulfur content is processed. Therefore, the development of new catalysts is necessary. This work presents the behavior of Ni-Mo-W catalysts, supported on aluminum-titanium mixed oxides, tested in the deep hydrodesulfuration (HDS) of dibenzothiophene (DBT) at 623 K and 3.1 MPa. A kinetic study of the HDS of DBT was performed in a batch reactor and a complex kinetic model is proposed to calculate the reaction rate constants. Theoretical plots of concentration versus time were also obtained and compared with the experimental data.