Evidence for redispersion of Ni on LaMnO3 films following high-temperature oxidation

Kwon, Ohhun; Foucher, Alexandre C.; Huang, Renjing; Stach, Eric A.; Vohs, John M.; Gorte, Raymond J.

doi:10.1016/j.jcat.2022.01.036

Title: Evidence for redispersion of Ni on LaMnO₃ films following high-temperature oxidation

Journal Article · 07 February 2022 · Journal of Catalysis

DOI: https://doi.org/10.1016/j.jcat.2022.01.036 · OSTI ID:1842776

^[1]; Foucher, Alexandre C. ^[2]; Huang, Renjing ^[2];

^[2]; Vohs, John M. ^[2];

^[2]

Univ. of Pennsylvania, Philadelphia, PA (United States); University of Pennsylvania
Univ. of Pennsylvania, Philadelphia, PA (United States)

LaMnO₃ films, 0.5-nm thick, were deposited by atomic layer deposition (ALD) onto γ-Al₂O₃ that had been modified with 15-wt% CaO. The CaO was shown to be effective in preventing formation of LaAlO₃ that formed when La₂O₃ was deposited directly onto γ-Al₂O₃. Lattice fringes on the resulting CaAl₂O₄/γ-Al₂O₃ substrate were weakly resolved, allowing a detailed characterization of the LaMnO₃ films. High-resolution transmission electron microscopy (HR-TEM) images showed that the LaMnO₃ formed two-dimensional crystallites, ~10 to 15 nm wide, that covered most of the surface. Crystallites with (001) and (111) orientation were clearly identified. High-temperature oxidation caused Ni to spread over the LaMnO₃ film, suggesting there is a reaction of the Ni²⁺ cations with the perovskite lattice. Ni formed by high-temperature reduction on these films remained well dispersed and significantly more active for CO₂ reforming of CH₄ compared to Ni on MgAl₂O₄, even after repeated oxidation and reduction cycles at 1073 K. Finally, the implications of these results for understanding metal-support interactions between Ni and LaMnO₃ are discussed.

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Research Organization:: University of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; University of Pennsylvania Materials Research Science and Engineering Center (MRSEC)

Grant/Contract Number:: SC0009440

OSTI ID:: 1842776

Journal Information:: Journal of Catalysis, Journal Name: Journal of Catalysis Vol. 407; ISSN 0021-9517

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Title: Evidence for redispersion of Ni on LaMnO3 films following high-temperature oxidation

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Title: Evidence for redispersion of Ni on LaMnO₃ films following high-temperature oxidation