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Abstract
In the current work we present a detailed analysis of the hydride phase formation in industrial Pd/C nanocatalysts by means of combined in situ X-ray absorption spectroscopy (EXAFS), X-ray diffraction (XRD) and volumetric measurements for the temperatures from - 10 to 50 °C in the hydrogen pressure range from 0 to 1000 mbar. α- and β- hydride phases are clearly distinguished in XRD. For the first time, H/Pd atomic ratio were obtained by theoretical fitting of the near-edge region of the absorption spectra (XANES) and compared with volumetric measurements.
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1 Southern Federal University, Zorge Street 5, 344090 Rostov-on-Don, Russia; Department of Chemistry, University of Turin, Via P. Giuria 7, 10125 Turin, Italy
2 Southern Federal University, Zorge Street 5, 344090 Rostov-on-Don, Russia
3 Department of Chemistry, University of Turin, Via P. Giuria 7, 10125 Turin, Italy
4 Department of Chemistry, University of Turin, Via P. Giuria 7, 10125 Turin, Italy; Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, Via Valleggio 11, 22100 Como, Italy
5 Institut Laue-Langevin (ILL), 6 Rue Jules Horowitz, F-38042, Grenoble, France
6 Southern Federal University, Zorge Street 5, 344090 Rostov-on-Don, Russia; SNBL at ESRF, 6 Rue Jules Horowitz, F-38042 Grenoble, France
7 Chimet SpA - Catalyst Division, Via di Pescaiola 74, I-52041 Arezzo, Italy
8 ETH Zurich, Institute for Chemical and Bioengineering, Zurich, Switzerland; Laboratory for Catalysis and Sustainable Chemistry, SLS, PSI, Villigen, Switzerland