Hydride phase formation in carbon supported palladium hydride nanoparticles by in situ EXAFS and XRD

16th International Conference on X-ray Absorption Fine Structure

Bugaev, A.L.^1,2 ; Guda, A.A.^1 ; Lomachenko, K.A.^1,2 ; Lazzarini, A.^2 ; Srabionyan, V.V.^1 ; Vitillo, J.G.^2,8 ; Piovano, A.^3 ; Groppo, E.^2 ; Bugaev, L.A.^1 ; Soldatov, A.V.^1 ; Dmitriev, V.P.^1,4 ; Pellegrini, R.^5 ; Van Bokhoven, J.A.^6,7 ; Lamberti, C.^1,2

Southern Federal University, Zorge Street 5, Rostov-on-Don

344090, Russia^1

Department of Chemistry, University of Turin, Via P. Giuria 7, Turin

10125, Italy^2

Institut Laue-Langevin (ILL), 6 Rue Jules Horowitz, Grenoble

F-38042, France^3

SNBL at ESRF, 6 Rue Jules Horowitz, Grenoble

F-38042, France^4

Chimet SpA - Catalyst Division, Via di Pescaiola 74, Arezzo

I-52041, Italy^5

ETH Zurich, Institute for Chemical and Bioengineering, Zurich, Switzerland^6

Laboratory for Catalysis and Sustainable Chemistry, SLS, PSI, Villigen, Switzerland^7

Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, Via Valleggio 11, Como

22100, Italy^8

关键词: Atomic ratio;    Carbon supported palladiums;    Edge region;    Hydride phase formation;    Hydride phasis;    Hydrogen pressures;    In-situ X-ray absorption spectroscopy;    Volumetric measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012032/pdf
DOI  :  10.1088/1742-6596/712/1/012032

来源: IOP

【 摘 要 】

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.