Oxidation-induced structural changes in sub-nanometer platinum supported on alumina

DeBusk, Melanie Moses; Allard, Jr, Lawrence Frederick; Blom, Douglas Allen; Narula, Chaitanya Kumar

doi:10.1002/cctc.201500267

Title: Oxidation-induced structural changes in sub-nanometer platinum supported on alumina

Journal Article · Fri Jun 26 04:00:00 UTC 2015 · ChemCatChem

DOI: https://doi.org/10.1002/cctc.201500267 · OSTI ID:1187918

DeBusk, Melanie Moses ^[1]; Allard, Jr, Lawrence Frederick ^[2]; Blom, Douglas Allen ^[2]; Narula, Chaitanya Kumar ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy & Transportation Science Div.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Platinum supported on alumina is an essential component of emission treatment catalysts used in transportation. Theoretical, experimental, and mechanistic aspects of platinum particles supported on a variety of supports have been extensively studied; however, available experimental information on the behavior of single vs. sub-nanometer platinum is extremely limited. To bridge the knowledge gap between single supported platinum and well-formed supported platinum nanoparticles, we have carried out synthesis, characterization, and CO and NO oxidation studies of sub-nanometer platinum supported on α, θ, and γ-Al₂O₃ and monitored changes in structure upon exposure to CO and NO oxidation conditions. Furthermore, we find that sub-nanometer Pt is highly effective for CO oxidation due to high platinum dispersion but is not very efficient as NO oxidation catalyst. Lastly, sub-nanometer platinum agglomerates rapidly under CO or NO oxidation conditions to form nanoparticles.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1187918

Journal Information:: ChemCatChem, Journal Name: ChemCatChem Journal Issue: 15 Vol. 7; ISSN 1867-3880

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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Stability investigation of a high number density Pt ₁ /Fe ₂ O ₃ single-atom catalyst under different gas environments by HAADF-STEM Duan, Sibin; Wang, Rongming; Liu, Jingyue Nanotechnology, Vol. 29, Issue 20 https://doi.org/10.1088/1361-6528/aab1d2	journal	March 2018

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