A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3)
Abstract
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.
- Authors:
-
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Publication Date:
- Research Org.:
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1734646
- Grant/Contract Number:
- FG02-13ER16380; SC0009440
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Inorganics
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 12; Journal ID: ISSN 2304-6740
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Atomic Layer Deposition; Ni catalyst; reforming catalyst; thermodynamics
Citation Formats
Lin, Chao, Foucher, Alexandre C., Stach, Eric A., and Gorte, Raymond J. A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3). United States: N. p., 2020.
Web. doi:10.3390/inorganics8120069.
Lin, Chao, Foucher, Alexandre C., Stach, Eric A., & Gorte, Raymond J. A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3). United States. https://doi.org/10.3390/inorganics8120069
Lin, Chao, Foucher, Alexandre C., Stach, Eric A., and Gorte, Raymond J. Fri .
"A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3)". United States. https://doi.org/10.3390/inorganics8120069. https://www.osti.gov/servlets/purl/1734646.
@article{osti_1734646,
title = {A Thermodynamic Investigation of Ni on Thin-Film Titanates (ATiO3)},
author = {Lin, Chao and Foucher, Alexandre C. and Stach, Eric A. and Gorte, Raymond J.},
abstractNote = {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.},
doi = {10.3390/inorganics8120069},
journal = {Inorganics},
number = 12,
volume = 8,
place = {United States},
year = {Fri Dec 11 00:00:00 EST 2020},
month = {Fri Dec 11 00:00:00 EST 2020}
}
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