(514c) Mo2C Supported NiMo Alloys for Synthesis Gas Production Via Partial Oxidation of Surrogate Biodiesel
We have synthesized supported NiMo alloy on Mo2C demonstrating the synergistic effect of combining Ni and Mo2C for the partial oxidation of methyl oleate. Both calcination temperature and the carburization process play a crucial role in determining the final Ni phase over the Mo2C surface. The lower calcination temperature of 4000C leads to the formation of metallic Ni, where as higher calcination temperature of 5000C leads to the formation of NiMo solid solution. During the carburization, metallic Ni converts to δ-NiMo alloy in the case of catalyst I, where as in the case of catalyst II, the NiMo solid solution maintains its phase. Regardless of the calcination temperature used, enhanced initial performance in terms of H2 and CO yields was observed, compared to that of pure Ni and pure Mo2C. Both δ-NiMo alloy and NiMo solid solution seem to be catalytically active for methane reforming as neither catalyst I nor catalyst II show any presence of methane in the product stream. However, the carbon conversion only increases when δ-NiMo alloy is present over Mo2C. Thus, δ-NiMo alloy seems to be more active in terms of reforming of methyl oleate than does NiMo solid solution. Over 24 hours time-on-stream catalyst I maintains its high performance without coking. On the other hand, Mo2C without the dispersed δ-NiMo alloy shows a stable performance only for the first 10 h. The introduction of δ-NiMo alloy to the Mo2C surface enhances H2 yield and carbon conversion as well as improves its long-term stability.