Low-Loading Ni-Co Catalysts on CeO₂ by Sputtering Deposition for Selective Hydrogen Production via ESR
Palavras-chave:
Ethanol steam reforming, Magnetron sputtering deposition, coke resistanceResumo
Monometallic and bimetallic Ni/Co catalysts supported on CeO2 were prepared by magnetron sputtering deposition (SD). The approach aimed to achieve 1 wt.% of total metal content. Structural and textural characterizations (XRD, N2 physisorption, STEM-EDS, TPR, H2 chemisorption) confirmed that the method resulted in high metal dispersion and strong metal-support interactions. The synergistic behavior between Ni and Co was investigated in the ethanol steam reforming reaction (ESR) at 500°C and atmospheric pressure. Bimetallic catalysts were prepared either by simultaneous metal deposition or by varying the sequence of metal addition. Among the evaluated systems, the Ni-Co/CeO2 catalyst -where Ni was deposited prior to Co- exhibited the best catalytic performance, sustaining ethanol conversion above 75% and hydrogen selectivity close to 75% throughout the reaction. The enhanced activity and stability are attributed to improved metal dispersion, stronger interaction with the CeO2 support, and the formation of more active bimetallic sites resulting from the optimized metal deposition sequence.
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