This study demonstrates the ability of Ni/Mo 2 C to catalyze the Methane Bireforming Reaction (combined Dry Methane Reforming Reaction, CH 4 + CO 2  2H 2 + 2CO, and Steam Methane Reforming Reaction, CH 4 + H 2 O  3H 2 + CO). By varying the ratio of CO 2 :H 2 O, the resulting H 2 :CO ratio could be tuned from 0.91 to 3.0, covering a wide range of Syn Gas (H 2 + CO) ratios relevant to various hydrocarbon syntheses. We also document the unusual deactivation behavior of Ni/Mo 2 C in this system. The catalytic activity would change from very high (greater than 50% conversion) to very low (less than 10% conversion) within 10 minutes. Despite running under conditions typically favorable for coking with a Ni catalyst (high temperature, 950°C, and excess methane), XRD, TGA, TEM, SEM, and EDX results clearly show no evidence of coking during the reaction or after deactivation. In addition, the changes to the Ni/Mo 2 C catalyst seen after deactivation (oxidation of Mo 2 C to MoO 2 , Ni-phase changes, and catalyst morphology changes) could not be seen in the catalyst subjected to reaction conditions that were halted before deactivation could occur. This suggests a sudden, rapid deactivation "event" occurs in this catalytic system as opposed to gradual catalyst deactivation, a behavior more typically seen with catalysts.