Three-dimensional probing of catalyst ageing on different length scales: A case study of changes in microstructure and activity for CO oxidation of a Pt-Pd/Al2O3 catalyst
Artikel i vetenskaplig tidskrift, 2017
In the present study the effects of thermal treatment on the microstructure of a Pt-Pd/Al2O3 oxidation catalyst and its activity for CO oxidation have been studied. The microstructural analysis was performed using several high-resolution electron microscopy techniques like STEM, FIB/SEM slice & view, SEM and EDX. A combination of these analysis techniques and advanced TEM specimen preparation allowed for three-dimensional probing at different length scales avoiding the random character of conventionally crushed powder specimens due to site specificity. A core-shell distribution of Pt-Pd nanoparticles within the alumina support particles, with enlarged nanoparticles (≈ 1.5 to 40 nm) being present in the shell and small nanoparticles (< 1.5 nm) in the core, was revealed in the untreated catalyst. A more uniform spatial
distribution developed during thermal treatment at 700 °C or higher with larger nanoparticles forming in the core. Accompanying measurements of the catalytic activity for CO oxidation showed the detrimental effect of sintering of the small nanoparticles on the
reaction rate and apparent activation energy of the reaction.
TEM
platinum
palladium
SEM
CO oxidation
Författare
Torben Nilsson Pingel
Kompetenscentrum katalys (KCK)
Chalmers, Fysik, Eva Olsson Group
Sheedeh Fouladvand
Kompetenscentrum katalys (KCK)
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Marc Heggen
Forschungszentrum Jülich (FZJ)
R. E. Dunin-Borkowski
Forschungszentrum Jülich (FZJ)
Wolfgang Jäger
Kompetenscentrum katalys (KCK)
Chalmers, Fysik
Peter Westenberger
FEI
Daniel Phifer
FEI Europe B.V.
Jace McNeil
FEI
Magnus Skoglundh
Kompetenscentrum katalys (KCK)
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Henrik Grönbeck
Kompetenscentrum katalys (KCK)
Chalmers, Fysik, Kemisk fysik
Eva Olsson
Chalmers, Fysik, Eva Olsson Group
Kompetenscentrum katalys (KCK)
ChemCatChem
1867-3880 (ISSN) 1867-3899 (eISSN)
Vol. 9 18 3544-3553Enabling Science and Technology through European Electron Microscopy (ESTEEM 2)
Europeiska kommissionen (FP7) (EC/FP7/312483), 2012-10-01 -- 2016-09-30.
Drivkrafter
Hållbar utveckling
Styrkeområden
Nanovetenskap och nanoteknik
Transport
Energi
Materialvetenskap
Ämneskategorier (SSIF 2011)
Kemiska processer
Den kondenserade materiens fysik
DOI
10.1002/cctc.201700479