Abstract
This paper deals with the quantitation of XPS data of supported catalysts using the so-called sheet stacking model with surface segregation. The supported material was assumed to have a bimodal distribution with a fraction x 1 of small particles (size C 1) homogeneously distributed throughout the support and a fraction of larger particles (size C 2) segregated on the external surface of the support. Based on an arbitrary value of C 1, the method proposed provides estimates for C 2 and the relative amount of each fraction of particles. Effects of various parameters on the particle distribution ( C 2 and x 1) were assessed. The merits and limitations of the proposed method are discussed.
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