Figure 6.

Formation rate during CO oxidation in different reaction atmospheres (standard, O₂‐rich, and CO‐rich) at 80 °C on a Au/CeO₂ catalyst after oxidative (O400, top) and reductive (H400, bottom) pretreatment in 10 % O₂ in N₂ at 400 °C (black circles) and the relative Ce³⁺ content during time on stream as extracted from LCA analysis of operando XANES spectra during reaction (blue, green, and red symbols). The dashed blue line denotes the initial Ce³⁺ ratio (right scale). Representative error bars are shown for each sequence. Reprinted with permission from Ref. [54] © 2019, MDPI.