“Intelligent” Pt Catalysts Based on Thin LaCoO3 Films Prepared by Atomic Layer Deposition

Mao, Xinyu; Foucher, Alexandre C.; Stach, Eric A.; Gorte, Raymond J.

doi:10.3390/inorganics7090113

Title: “Intelligent” Pt Catalysts Based on Thin LaCoO3 Films Prepared by Atomic Layer Deposition

Journal Article · Thu Sep 12 00:00:00 EDT 2019 · Inorganics

DOI:https://doi.org/10.3390/inorganics7090113· OSTI ID:1561391

Mao, Xinyu;

;

LaCoO₃ films were deposited onto MgAl₂O₄ powders by atomic layer deposition (ALD) and then used as catalyst supports for Pt. X-ray diffraction (XRD) showed that the 0.5 nm films exhibited a perovskite structure after redox cycling at 1073 K, and scanning transmission electron microscopy and elemental mapping via energy-dispersive X-ray spectroscopy (STEM/EDS) data demonstrated that the films covered the substrate uniformly. Catalysts prepared with 3 wt % Pt showed that the Pt remained well dispersed on the perovskite film, even after repeated oxidations and reductions at 1073 K. Despite the high Pt dispersion, CO adsorption at room temperature was negligible. Compared with conventional Pt on MgAl₂O₄, the reduced forms of the LaCoO₃-containing catalyst were highly active for the CO oxidation and water gas shift (WGS) reactions, while the oxidized catalysts showed much lower activities. Surprisingly, the reduced catalysts were much less active than the oxidized catalysts for toluene hydrogen. Catalysts prepared from thin films of Co₃O₄ or La₂O₃ exhibited properties more similar to Pt/MgAl₂O₄. Possible reasons for how LaCoO₃ affects properties are discussed.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC); Univ. of Pennsylvania, Philadelphia, PA (United States)

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

Grant/Contract Number:: FG02-13ER16380; SC0009440

OSTI ID:: 1561391

Alternate ID(s):: OSTI ID: 1593981

Journal Information:: Inorganics, Journal Name: Inorganics Vol. 7 Journal Issue: 9; ISSN 2304-6740

Publisher:: MDPICopyright Statement

Country of Publication:: Switzerland

Language:: English

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42 ENGINEERING
Pt catalyst
LaCoO3
CO oxidation
water gas shift reaction
atomic layer deposition (ALD)

Title: “Intelligent” Pt Catalysts Based on Thin LaCoO3 Films Prepared by Atomic Layer Deposition

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