The catalytic tri-reforming process involves synergetic combination of dry reforming, steam reforming and partial oxidation of methane. In such a combined process, CO2 emissions from a power plant flue gas can be utilized to produce syngas with a suitable H2:CO ratio desired for the Fischer-Tropsch process and methanol synthesis without the need for the CO2 pre-separation step.
The tri-reforming process requires a novel catalyst that is thermally stable at temperatures between 700 °C and 900 °C and has a high surface area, good redox properties, and high O2 storage capacity. Typically nickel-based catalysts are reported to have high activity for both steam and dry reforming processes. However, nickel particles supported on metal oxides tend to deactivate through coke formation and sintering. The deactivation of the catalyst is influenced by the catalyst structure, metal dispersion, and composition.
In this work, a series of nickel-based catalysts supported on Al2O3, SiO2, CeO2 and YSZ have been evaluated for their performance in the tri-reforming reaction under simulated natural gas combustion flue gas. Throughout these catalysts Ni/Al2O3 showed the highest CH4 conversion of 72% with a CO2 conversion of 57% at 850 °C. In addition, Ni/CeO2 indicated lower CH4 and CO2 conversions of 61% and 40%, respectively. Both Ni/Al2O3 and Ni/CeO2 catalysts showed a H2:CO ratio of 1.75.
Additional efforts focus on synthesizing Nickel/Ceria nanorods and Nickel@Ceria core-shell nanoparticles, which could be an effective catalyst for the tri-reforming reaction. Details of the synthesis methodologies and characterization of the catalysts will be discussed.
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