Oscillatory Behavior during the Catalytic Partial Oxidation of Methane

Nov 7, 2011 - Enhanced Methane Conversion Under Periodic Operation Over a Pd/Rh Based TWC in the Exhausts from NGVs. D. Bounechada , G. Groppi ...
0 downloads 0 Views 329KB Size
Supporting Information

Oscillatory behavior during the catalytic partial oxidation of methane: Following dynamic structural changes of palladium using the QEXAFS technique Jan Stötzela, Ronald Frahma, Bertram Kimmerleb, Maarten Nachtegaalc and Jan-Dierk Grunwaldtd,e a

Fachbereich C – Physik, Bergische Universität Wuppertal, Gaußstr. 20, D-42097 Wuppertal, Germany b

c

d

Gutenbergstr. 35, CH-3011 Bern

Paul-Scherrer-Institut (PSI), CH-5232 Villigen, Switzerland

Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, D-76128 Karlsruhe, Germany

e

Department of Chemical and Biochemical Engineering, Technical University of Denmark, Building 229, DK-2800 Kgs. Lyngby, Denmark

1

Figure S1. Extracted k3-weighted EXAFS functions in k-space: The blue and green cases are relevant to this paper as they represent the data quality leading to the EXAFS results presented in Figure 8, 9 (blue) and 12 (green).

Figure S2. LCA weights of PdO of the same data set treated with different averaging procedures: (black) averaged over 5 spectra, (red) averaged with a moving rectangular window with a width of 40 spectra and (blue) averaged with a moving gauss window with 3σ = 40 spectra. The data is taken from the same run with the FSP catalyst as Figures 1 – 3 within the paper.

2

Figure S3. Intensity and position in energy of the two XANES peaks detectable above the Pd K-edge: The peaks correspond to the 1s  5p and 1s  4f electron transitions and evidence (in combination with Figure 13 in this paper) that no hydrogen is incorporated.

3