Unsupported molybdenum and cobalt-molybdenum nitrides for thiophene hydrodesulfurization

The catalytic activity and the structure of unsupported Mo and CoMo nitride d catalysts were investigated. It was found that the structure and catalyti c activity of the nitrided catalysts are influenced by the conditions of ni tridation. Molybdenum oxynitrides are more active in hydrodesulfurization ( HDS) of thiophene than MoS2. The addition of cobalt to nitrided Mo improves its HDS activity, however, sulfided CoMo catalyst is still more active tha n the nitrided one. Synergy between Co and Mo for the nitrided unsupported CoMo catalyst exists at lower degree than fur the sulfided form of CoMo.