SYNTHESIS AND HYDRODESULFURIZATION (HDS) AND HYDROGENATION (HYD) ACTIVITY OF DIMOLYBDENUM NITRIDE

Various kinds of surface area gamma-Mo2N were synthesized by a topotac tic reaction between MoO3 and NH3 under relatively mild conditions. It was found that the space velocity of NH3 and the particle size of MoO 3 were very important for the synthesis of high surface area gamma-Mo2 N in a large batch. The percent of micropore volume in the range of 20 -30 Angstrom gradually increased with increase of surface area. XRD re sults indicated that the intensities of diffraction peaks of high surf ace area gamma-Mo2N was different from those of low surface area. The measurements of catalytic activities for thiophene hydrodesulfuriztion and cyclohexene hydrogenation showed that high surface area gamma-Mo2 N exhibited much higher activity than those of medium and low surface area gamma-Mo2N. Meanwhile, a hydrodesulfurizing mechanism of thiophen e is proposed.