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Article

A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3)

1
Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 34th Street, Philadelphia, PA 19104, USA
2
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
*
Author to whom correspondence should be addressed.
Received: 25 November 2020 / Revised: 8 December 2020 / Accepted: 9 December 2020 / Published: 11 December 2020
(This article belongs to the Special Issue Cornerstones in Contemporary Inorganic Chemistry)
Thin, ~1-nm films of CaTiO3, SrTiO3, and BaTiO3 were deposited onto MgAl2O4 by Atomic Layer Deposition (ALD) and then studied as catalyst supports for ~5 wt % of Ni that was added to the perovskite thin films by Atomic Layer Deposition. Scanning Transmission Electron Microscopy demonstrated that both the Ni and the perovskites uniformly covered the surface of the support following oxidation at 1073 K, even after redox cycling, but large Ni particles formed following a reduction at 1073 K. When compared to Ni/MgAl2O4, the perovskite-containing catalysts required significantly higher temperatures for Ni reduction. Equilibrium constants for Ni oxidation, as determined from Coulometric Titration, indicated that the oxidation of Ni shifted to lower PO2 on the perovskite-containing materials. Based on Ni equilibrium constants, Ni interactions are strongest with CaTiO3, followed by SrTiO3 and BaTiO3. The shift in the equilibrium constant was shown to cause reversible deactivation of the Ni/CaTiO3/MgAl2O4 catalyst for CO2 reforming of CH4 at high CO2 pressures, due to the oxidation of the Ni. View Full-Text
Keywords: Atomic Layer Deposition; Ni catalyst; reforming catalyst; thermodynamics Atomic Layer Deposition; Ni catalyst; reforming catalyst; thermodynamics
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MDPI and ACS Style

Lin, C.; Foucher, A.C.; Stach, E.A.; Gorte, R.J. A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3). Inorganics 2020, 8, 69. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8120069

AMA Style

Lin C, Foucher AC, Stach EA, Gorte RJ. A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3). Inorganics. 2020; 8(12):69. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8120069

Chicago/Turabian Style

Lin, Chao, Alexandre C. Foucher, Eric A. Stach, and Raymond J. Gorte 2020. "A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3)" Inorganics 8, no. 12: 69. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8120069

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