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Catalytic oxidation of CO is one of several important reactions in the diverse catalysis field, and is key for the treatment and control of automotive exhaust gases, preventing fuel cell poisoning, regeneration of CO2 in sealedoff CO2 lasers, etc. [1]. Nanosized noble metals supported on reducible oxides such as iron and cobalt oxides have been recently found to enhance the catalytic activity in CO oxidation in comparison to non-reducible oxides [2]. Pair distribution function analysis (PDF) based on total scattering data [3] is one of the techniques of choice for the structural characterization of these nanosized catalytic materials, which are often present at very low concentrations and are sometimes amorphous. An advanced application of PDF is the so-called differential PDF (d-PDF), which is based on the subtraction of the PDF of a matrix from the PDF of the system “matrix + guest species”, in order to isolate the interatomic correlations of the guest species [4–6]. To enable this approach particular care must be taken in both the data collection (especially reducing the statistical noise in the experimental data) and in the subsequent analysis, because of the weakness of the signal to be analyzed, which results from the difference of the PDFs. In this contribution we demonstrate the application of this method to investigate the structural properties of nanosized PdO phase distributed on the reducible Fe2O3 support. Unlike dPDF studies previously reported which were based on synchrotron data [4–6], we used a laboratory diffractometer to collect high energy X-ray diffraction data [7–10].

Application of Differential PDF to the Structural Characterization of Supported Catalysts