TY - JOUR
T1 - Sintering Mechanism of Pt/Al2O3 in Complex Emission Gases Elucidated via In Situ Environmental STEM
AU - Smith, Jacob
AU - Liccardo, Gennaro
AU - Cendejas, Melissa C.
AU - Stone, Michael
AU - Mandal, Shyama
AU - Abild-Pedersen, Frank
AU - Cargnello, Matteo
AU - Chi, Miaofang
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024
Y1 - 2024
N2 - 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. These findings provide valuable insights into catalyst degradation behavior in complex gas environments.
AB - 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. These findings provide valuable insights into catalyst degradation behavior in complex gas environments.
UR - http://www.scopus.com/inward/record.url?scp=85197518032&partnerID=8YFLogxK
U2 - 10.1021/acsmaterialslett.4c00422
DO - 10.1021/acsmaterialslett.4c00422
M3 - Article
AN - SCOPUS:85197518032
SN - 2639-4979
SP - 3301
EP - 3311
JO - ACS Materials Letters
JF - ACS Materials Letters
ER -