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

Lin, Chao; Foucher, Alexandre C.; Stach, Eric A.; Gorte, Raymond J.

doi:10.3390/inorganics8120069

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

Journal Article · Fri Dec 11 00:00:00 EST 2020 · Inorganics

DOI:https://doi.org/10.3390/inorganics8120069· OSTI ID:2395977

Lin, Chao; ; Stach, Eric A.;

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.

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: SC0009440

OSTI ID:: 2395977

Alternate ID(s):: OSTI ID: 1734646

Journal Information:: Inorganics, Journal Name: Inorganics Journal Issue: 12 Vol. 8; ISSN 2304-6740; ISSN INORCW

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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

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