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The Mo/Al 2 O 3 catalyst was modified by Ir (0.1-0.8wt.%) and tested in the parallel hydrodenitrogenation (HDN) of pyridine and hydrodesulfurization (HDS) of thiophene. It was found that Ir addition had positive effect on both HDN and HDS, influenced by Ir loading and by the way of catalyst preparation. A synergetic effect between Mo and Ir was observed in HDN (three times) while not...