Advances of isomerizing-hydrogenating properties of CoMo catalysts supported on ASA-Al2O3

Abstract

CoMo/Al2O3-ASA catalysts with different Al2O3/ASA ratio have been studied. The amount of ASA (Si/Al ratio 0.25 wt./wt.) varied from 0 to 100 % in the support. Supports and catalysts were characterized by low-temperature N2 adsorption-desorption, TPD-NH3, IRS of adsorbed pyridine, HRTEM, UV-vis spectroscopy, XPS, XRD, bulk crushing strength. Catalysts were tested in hydrotreating of the model FCC gasoline containing 250 ppm of sulfur from thiophene, 40 wt.% of toluene, 40 wt.% of heptane and 20 wt.% of 1-hexene. It was shown that the introduction of ASA to the support increased the amount of weak Brønsted acid sites and weak and medium Lewis acid sites. The addition of ASA changed the morphology of sulfide active component and extract Co from the composition of the CoMoS phase. It was shown that presence of more than 50 wt.% of ASA in the samples demonstrated significant changes in the selectivity of CoMo catalysts.