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Lecture Friedrich Esch

Rooster

WanneerWaar
19 december 2006 FWN-Building 5118.-152, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. Friedrich Esch
Affiliation:Laboratorio TASC CNR-INFM, Trieste, Italy
Title:Scanning Tunneling Microscopy Studies on Oxide Surfaces: Oxygen vacancies on Ceria and the Oxidation of Rh(110)
Date:Tue Dec 19, 2006
Start:13.30
Location:FWN-Building 5118.-152
Host:P. Rudolf
Telephone:+31 50 363 4736

Abstract

In my talk I will show how Scanning Tunnelling Microscopy (STM) can be used to study fundamental questions concerning catalytically relevant oxide surfaces. A first part concerns oxygen vacancies on ceria (CeO2), a highly performing catalyst support used in oxidation reactions due to its capacity to store and release oxygen and to activate supported metals. By studying CeO2(111), we show that electron localization determines which vacancy clusters form on this surface and which do not: as a general rule, vacancy clusters expose exclusively reduced Ce3+ ions. The second part of the talk deals with the formation of oxide phases on transition metals in order to identify the active phase in catalytic oxidation reactions. We have studied the structure and reactivity of the surface oxide on Rh(110) and show the mutual influence of oxide formation and oxygen incorporation.
Laatst gewijzigd:22 oktober 2012 14:30