Synergistic effect of bimetal for steam reforming of n-decane over M-M/CaO-Al2O3 (M = Fe, Co, Ni) catalysts under low S/C condition

To improve stability of steam reforming catalyst, Ni, Co, and Fe monometallic and bimetallic catalysts supported on CaO-Al2O3 were prepared. The Ni-Fe/CaO-Al2O3 (NF/CA) catalyst exhibited the highest gas yield of 91.8% and H-2 selectivity of 70.9% at 850 degrees 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 degrees 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. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

To improve the stability of steam reforming catalyst, Ni, Co, and Fe monometallic and bimetallic catalysts supported on CaO-Al2O3 were prepared. Among them, the Ni-Fe/CaO-Al2O3 (NF/CA) catalyst showed the best performance under low steam-to-car carbon ratio condition, with high gas yield and selectivity, low carbon mass, and stable activity.