Cube-shaped metal foam catalyst for natural gas pre-reforming in solid oxide fuel cell systems

초록

Cube-shaped metal foam catalysts, coated with Ni and 0.5 wt% Ru, were developed for natural gas pre-reforming in solid oxide fuel cell (SOFC) systems. Pre-reforming occurs at temperatures below 500 degrees C and requires catalysts with good thermal conductivity and low-temperature activity. In this study, NiCrAl metal foam surfaces were coated with Ni(X mM)/MgAl2O4 and Ru/Ni(X mM)/MgAl2O4 catalysts via deposition-precipitation at various Ni solution concentrations (X = 100-500 mM). Ni plate particles were uniformly formed on the metal foam, exhibiting a desert rose-like shape with increasing Ni concentration. The Ru/Ni/MgAl2O4 foam catalysts containing 0.5 wt% Ru had large metallic surface areas and low-temperature reducibility due to the synergistic effect between Ni and Ru. The Ru/Ni(300 mM)/MgAl2O4 coated foam catalyst effectively suppressed metal aggregation and enhanced low-temperature reducibility, thereby exhibiting higher carbon conversion compared to Ni(300 mM)/MgAl2O4 and Ru/MgAl2O4 catalysts at 500 degrees C, 8000 h- 1 and a steam-to-carbon (S/C) ratio of 3. Additionally, the Ru/Ni(300 mM) catalyst demonstrated better coke resistance than the Ni(300 mM) catalyst in a stability test at a low S/C ratio of 1 for 20 h.

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