Figure 54.

(a, b) Normalized XANES spectra at Pd K-edge and (c, d) k²-weighted FT EXAFS spectra of Pd/γ-Al₂O₃ and Pd/La-doped γ-Al₂O₃. The spectra were collected at different temperatures under CO oxidizing conditions. (e) Fraction of Pd⁰ formed under operating conditions of the catalysts Pd/γ-Al₂O₃ and Pd/La-doped γ-Al₂O₃. (f) Model of Pd over La-doped La₂PdO₄ structure, (g) model for EXAFS fit including the aluminum atom and, (h) space-filling model of γ-Al₂O₃ (100) surface. Adapted with permission from ref (186). Copyright 2014, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.