Figure 9.

Time‐dependent Raman and UV‐vis operando spectroscopic information for the ceria subsurface reduction state of 0.5 wt.% Au/CeO₂. A): During two consecutive exposures to reaction conditions after oxidative pretreatment. B) During reaction after reductive pretreatment. Black squares indicate the catalytic activity of the catalyst, blue squares the position of the F_2g Raman mode, and brown squares the UV‐Vis reflectivity at 570 nm. The scales are identical for both graphs. Reprinted with permission from Ref. [77] © 2018, American Chemical Society.