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SUMMARY:Nano-structural and chemical characterisation of supported noble m
 etal catalysts using Transmission Electron Microscopy techniques - José A
 . Pérez-Omil\, Department of Chemistry\, University of Cambridge
DTSTART:20061107T150000Z
DTEND:20061107T160000Z
UID:TALK5861@talks.cam.ac.uk
CONTACT:Edmund Ward
DESCRIPTION:Ceria-based mixed oxide supported metal catalysts are importan
 t materials\, from a scientific and technological point of view\, due to i
 ts application as a TWC for the purification of the air coming from the ex
 haust system of the automobiles. At the same time they are promising candi
 dates to be used for the production of hydrogen from methane\, a challenge
  area of research at the present moment. In both applications the characte
 rization of the supported metal particles and the red-ox behaviour of the 
 mixed oxide are key parameters to understand the properties of the catalys
 ts.\n\nThe application of High Resolution Electron Microscopy (HREM)\, in 
 combination with image analysis and image simulation tools\, to retrieve s
 tructural and chemical information from these catalysts is presented. Fine
  details about the metal particles\, such as the size\, the morphology\, o
 xidation state and the interaction with the support\, as well as the bulk 
 structure of the ceria-based mixed oxide\, have been established at differ
 ent red-ox treatments.\n\nOne important feature to face for the interpreta
 tion of HREM images of metal/support discrete interfaces is the developmen
 t of a methodology to construct the complex super-cells which are required
  as input data for the multi-slice simulation programs. This presentation 
 includes a description of a proposed approach to model size\, shape\, face
 ting\, and relative orientation of metal and support particles.  \n
LOCATION:T001 [Tower Seminar Room]\, Materials Science and Metallurgy\, De
 partment of
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