Surface composition and reactivity of catalytic systems at micro- and nano- scales

Maya Kiskinova 

Sinchrotrone Trieste, Trieste, Italy


Most of the attempts to quantify the reactivity and selectivity of catalytic systems have been focused on characterization of specific surface structures, where electronic perturbations are induced by varying the particle size or by adding small amounts of substances. Addressing specific systems the lecture will illustrate the important contribution of chemical specific imaging combined with laterally resolved structural characterizations to understanding key factors controlling the processes at complex surfaces and interfaces related to catalysis. The local composition and reactivity of the phases that can be formed and coexist during oxidation reactions will be described comparing the results obtained with single crystal metal surfaces, micrometer-sized metal particles and nano-crystalline films supported on different substrates.[1] The complexity of the realistic reaction systems, where mass transport processes can introduce lateral heterogeneity in the composition and structure of the interface creating local micro-reactors with different catalytic activity, will be discussed on the bases of recent results with bimetallic systems.[2] The effect of electron confinement will be shown for oxidation of ultrathin metallic films, where varying the film thickness the sensible differences in the local oxidation rate are observed and correlated to periodic changes in the density of electronic states induced by quantum-well states crossing the Fermi level.[3] 1. P. Dudin et al, J. Chem. Phys.B 109, 2005, 13649. 2. A. Locatelli et al, J. Am. Chem. Soc. 127, 2005, 2351. 3. L. Aballe et al, Phys. Rev. Lett. 93, 2004, 196103.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: must be provided.


Presentation: Keynote lecture at E-MRS Fall Meeting 2006, Symposium B, by Maya Kiskinova
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-11 14:23
Revised:   2009-06-07 00:44
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine