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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20261002T134234Z
UID:https://www.mpie.de/events/36543/3755656
DTSTART:20240130T160000Z
DTEND:20240130T170000Z
CLASS:PUBLIC
CREATED:20240117T094115Z
DESCRIPTION:Our aim is to understand processes that lead to the emergence o
 f catalytic function though direct observation using a combination of oper
 ando scanning and transmission electron microscopy. Starting with simple m
 odel catalysts\, such as polycrystalline metal foils\, we observe the prop
 agation of chemical waves and reveal how catalytic activity depends on gra
 in orientation\, coupling mechanisms and reaction conditions. In the case 
 of redox-reactions on non-noble metals\, we find that the active catalyst 
 is operating near a phase-boundary where metallic and oxidized phases co-e
 xist. Real-time imaging reveals fascinating oscillatory redox dynamics tha
 t increase in complexity with increasing chemical potential of the gas-pha
 se. When moving from simple model catalysts to industrially relevant metal
  nanoparticles supported on reducible oxide carriers\, we apply in-situ tr
 ansmission electron microscopy to study effects related to a strong metal-
 support interaction (SMSI) under reactive conditions. Using the archetypic
 al titania supported platinum nanoparticles as a reference system\, and hy
 drogen oxidation as model redox reaction\, it will be shown that the well-
 described encapsulated state of platinum particles is lost as soon as the 
 system is exposed to a redox-active environment. Structural incoherence at
  the platinum-titania interface lowers the barrier for redox processes\, w
 hich give rise to dynamic reconstructions and particle migration. The part
 icle orientation on the support determines the structure of the interface 
 and the resulting particle dynamics\, migration\, and sintering behaviour.
  The aim of the presentation is to demonstrate that active catalysts are d
 ynamically adapting to the reaction environment and that catalytic functio
 n is related to the catalysts ability to participate in the reaction throu
 gh reversible changes in its structure and/or (local) composition.\nSpeake
 r: Prof. Marc Willinger
LAST-MODIFIED:20240418T091006Z
LOCATION:Max-Planck-Institut für Eisenforschung GmbH\, Room: Big Seminar R
 oom / Online
SUMMARY:Observing while it happens: Operando Electron Microscopy in Catalys
 is Research 
URL;VALUE=URI:https://www.mpie.de/events/36543/3755656
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