Figure 21.

Operando IR spectroscopy reveals the occurrence of H₂-induced restructuring of Pt NPs on an industrial Pt/Al₂O₃ catalyst. (a) Evolution of the IR spectra as a function of time (from top to bottom) for a freshy reduced Pt/Al₂O₃ catalyst during dehydrogenation in N₂ flow (20 mL/min) at 120 °C. Adapted with permission from ref (319). Copyright 2019 American Chemical Society. (b) Evolution of the intensity of the bands I–IV as a function of time for the spectra shown in part a). (c) Number of linear (top, empty circles) and multicoordinated (bridge, full squares, and hollow, triangle) occupied sites for Pt₁₃H_n models on γ-Al₂O₃(100). The gray background identifies the stoichiometries accessible experimentally with the Pt/Al₂O₃ catalyst reported in parts (a and b). Adapted with permission from ref (280). Copyright 2011 John Wiley and Sons.