Sintering Mechanism of Pt/Al2O3 in Complex Emission Gases Elucidated via In Situ Environmental STEM

Smith, Jacob; Liccardo, Gennaro; Cendejas, Melissa C.; Stone, Michael; Mandal, Shyama; Abild-Pedersen, Frank; Cargnello, Matteo; Chi, Miaofang

doi:10.1021/acsmaterialslett.4c00422

Sintering Mechanism of Pt/Al₂O₃ in Complex Emission Gases Elucidated via In Situ Environmental STEM

Journal Article · Wed Jun 26 04:00:00 EDT 2024 · ACS Materials Letters

DOI:https://doi.org/10.1021/acsmaterialslett.4c00422· OSTI ID:2394718

^[1]; Liccardo, Gennaro ^[2]; Cendejas, Melissa C. ^[3]; Stone, Michael ^[4]; ^[2]; ^[2]; ^[4]; ^[5]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Duke Univ., Durham, NC (United States)

Emission control catalysts are crucial for protecting human health by preventing the release of harmful gases and unburnt fuel into the atmosphere. These catalysts often face deactivation through sintering processes in high-temperature, chemically reactive environments containing multiple gas species. Here, we use in situ environmental scanning transmission electron microscopy to monitor the sintering behavior and transient morphologies of Pt/Al₂O₃ in various relevant gas environments through controlled experiments. Our results reveal the particle migration and atomic ripening behavior of Pt/Al₂O₃ at the atomic scale in the presence of water vapor and oxygen, which differs from behaviors observed in single gas environments. We identify an atomic ripening mechanism involving the dissociation and migration of Pt adatom chains from Pt nanoparticles, observed only in combinational gases. Finally, these findings provide valuable insights into catalyst degradation behavior in complex gas environments.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: AC05-00OR22725; SC0022197

OSTI ID:: 2394718

Alternate ID(s):: OSTI ID: 2440457

Journal Information:: ACS Materials Letters, Journal Name: ACS Materials Letters Vol. 6; ISSN 2639-4979

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
metal nanoparticles
nanoparticles
oxygen
sintering
water vapor