Abstract
To improve stability of steam reforming catalyst, Ni, Co, and Fe monometallic and bimetallic catalysts supported on CaO–Al 2 O 3 were prepared. The Ni–Fe/CaO–Al 2 O 3 (NF/CA) catalyst exhibited the highest gas yield of 91.8% and H 2 selectivity of 70.9% at 850 °C under low steam-to-carbon ratio (S/C) of 1.1. Additionally, NF/CA showed the least average carbon mass, only 2.98 mg/cm 2 . What's more, activity of NF/CA was stable after running for 50 hours at 800 °C. This is owing to the interaction between Ni and Fe that promotes Ni species highly dispersed on the surface of carrier, reduces the size of metal particles, and optimizes the interaction between the metal species and the carrier. Furthermore, inferred from the reaction mechanism, NF/CA can facilitate the reactants to the path of H 2 and CO production, instead of by-product coking path, and can promote the carbon removal reaction to maintain long-term stability. • Synergistic effect of Ni, Co, Fe bimetal was investigated systematically. • Ni–Fe/CaO–Al 2 O 3 (NF/CA) catalyst is stable after running at 800 °C for 50 h. • NF/CA produced 70.9% hydrogen selectivity and only 2.98 mg/cm 2 coke. • Main reaction mechanism for the steam reforming of n -decane was studied. • NF/CA catalyzes water-gas shift reaction to improve H 2 yield under low S/C.
Published Version
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