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SUMMARY:About active sites and spectators in heterogeneous catalysis
DTSTART:20161006T160000
DTEND:20161006T170000
DTSTAMP:20260510T032006Z
UID:6c69f5c1b81093d133ea0c2b8c8d125649e02a4754c1b780a1b109cf
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. van Bokhoven Jeroen\nInstitute for Chemical and Bioengin
 eering\, ETH Zurich and Head of Laboratory for Catalysis and Sustainable C
 hemistry\, Paul Scherrer Institute\, Switzerland\nThe focus of my talk wil
 l address the difficulty to measure the structure of catalytically active 
 sites in heterogeneous catalysis. Most catalysts have large\n structural 
 heterogeneity and the identification of what constitutes the active site i
 s very complex. In supported metal catalysts\, the support cannot be assum
 ed to be an inactive component. Ceria is a well-known support that is able
  to store and release oxygen. For that reason\, it finds application in re
 actions that involve redox reactions. Upon oxygen release\, part of CeIV r
 educes to CeIII. The ceria oxygen-storage capacity and the presence of CeI
 II are often related to catalytic performance\, however quantitative descr
 iptions are lacking. By building on recently developed spectroscopic tools
  based on x-ray absorption and emission spectroscopy on the one hand and e
 lectron spectroscopy on the other\, we have been able to quantify the role
  of CeIII in the oxidation of carbon monoxide over Pt/CeO2. Transient meas
 urements with high time resolved x-ray emission spectroscopy showed the ex
 istence of CeIII as spectator and as active intermediate in the reaction. 
 The consequences of these observations on the relationshhip between oxygen
  storage capacity and the presence of CeIII on catalytic performanve will 
 be discussed.
LOCATION:Zeuzier https://www.google.com/maps/place/EPFL+Valais+Wallis/?ref
 =zeuzier
STATUS:CONFIRMED
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