Enhanced ethanol reforming with catalytic active ruthenium species derived from solid solution in lanthanum chromite
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Catalysis Science & Technology
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Ethanol steam reforming (ESR) is a promising route for renewable hydrogen production, but it requires highly active and coke-resistant catalysts to efficiently convert ethanol into hydrogen-rich mixtures. The ESR catalytic activity is investigated in single-phase LaCr1−xRuxO3 solid solutions with 0.0 ≤ x ≤ 0.20. Highly active ruthenium species are formed at the surface of the oxide in operando during ESR at 600 °C. These species have remarkable stability for ESR with strong resistance to coke formation, resembling single-atom catalysts. Samples reduced ex situ at higher temperature (900 °C) exhibit Ru exsolved nanoparticles with lower catalytic stability than the species obtained in operando during the ESR reaction. X-ray absorption spectroscopy and high-resolution transmission electron microscopy reveal that small metallic Ru species (≤ 2 nm) are formed under ESR reaction conditions, whereas in samples exsolved at 900 °C such species coexist with larger exsolved Ru particles (~5 nm), which are more likely to deactivate. The experimental results provide an innovative approach for solid solution-derived species in a refractory oxide matrix that are valuable for designing robust catalysts for ESR.
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MORAES, TAMARA S.; FERLAUTO, ANDRE S.; TINTI, VICTOR B.; FLORIO, DANIEL Z. de; PIAZZOLLA, FERNANDO; MIURA, YOHEI; DEAN, DAVID P.; PHAM, HIEN N.; MILLER, JEFFREY T.; DATYE, ABHAYA K.; FONSECA, FABIO C. Enhanced ethanol reforming with catalytic active ruthenium species derived from solid solution in lanthanum chromite. Catalysis Science & Technology, v. 15, n. 19, p. 5907-5923, 2025. DOI: 10.1039/d5cy00774g. Disponível em: https://repositorio.ipen.br/handle/123456789/49935. Acesso em: 15 Jun 2026.
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