Highly basic ceria-doped carbon nanofibers for H2 production via catalytic NH3 decomposition

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This study explores the effect of CeO 2 doping on the catalytic performance of Fe, Co, and Ni catalysts supported on carbon nanofibers (CNFs) for hydrogen production via ammonia decomposition. Incorporating CeO 2 significantly enhanced catalytic activity, achieving 90 % ammonia conversion at 600 °C. Stability tests confirmed sustained performance, maintaining high activity for at least 30 h on stream. A deep surface characterization revealed that the incorporation of Ni after the CeO 2 doping created nanocatalytic portions of highly dispersed Ni/CeO 2 on the CNFs structure. This guaranteed an intimate contact between the Ni and the CeO 2 , resulting in an increase in the H 2 production rate. Notably, Ni catalysts directly supported on bulk CeO 2 exhibited inferior performance, likely due to low relative surface of available ceria. These findings highlight CeO 2 -doped CNFs as a promising platform for scalable, high-performance hydrogen production from ammonia.

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