Effects of EDTA and Titania in the HDS of DBT

A series of TiO2-Al2O3 binary oxide supports were prepared by different methods and raw materials, namely using aluminum sulfate and titanium chloride (S1), γ-Alumina and titanium isopropoxide (S2), and a commercial boehmite and titanium isopropoxide (S3). Ethylenediaminetetraacetic acid (EDTA) with different EDTA/Co mole ratios (0.6, 1.2 and 1.8) was used as a chelating agent during the preparation of CoMo/Al2O3-TiO2. The samples were analyzed by XRD, BET, FT-IR and NH3-TPD experiments and tested on the dibenzothiophene (DBT) hydrodesulfurization (HDS) reaction. The results showed that the catalyst supported on S2 with EDTA/Co mole ratio of 1.2 had a HDS activity (in pseudo first order kinetic constant basis) value ~2.7 times higher to that of CoMo/Al2O3 catalyst