Tri-Reforming of Methane over NdM0.25Ni0.75O3 (M = Cr, Fe) Catalysts and the Effect of CO2 Composition

The NdM0.25Ni0.75O3 (M = Cr, Fe) named NCN and NFN catalysts precursors were synthesized and characterized. The CO2 utilization in the feed was studied in the methane tri-reforming to produce syngas at 850 degrees C. The catalysts presented orthorhombic structure and the elements (Nd, Cr or Fe, Ni and O) on the surface showed homogeneous dispersion. XPS indicates different states of nickel, iron and chromium, respectively, Ni2+, Fe3+ and Fe2+ and Cr3+ (or Cr4+) and Cr6+ species. The Tri-Reforming of Methane (TRM) was performed for conditions 1CH(4):0.5CO(2):0.5O2 (A) and 1CH(4):1CO(2):0.25O(2) (B), both with 0.25 H2O diluted in He. The conversions of methane were 74% for the NCN and 65% for the NFN catalysts. Both catalysts showed ratios (H-2/CO) of 1.5 and 2 for conditions A and B, respectively, at 850 degrees C. [GRAPHICS] .

Automated summary

The precursors of NCN and NFN catalysts were synthesized and characterized, showing an orthorhombic structure with elements like Nd, Cr or Fe, Ni and O evenly dispersed on the surface. XPS analysis revealed different states of nickel, iron and chromium in the catalysts. The methane tri-reforming reactions showed improved conversion rates and H-2/CO ratios for both catalysts under varying conditions at 850 degrees Celsius.