Fig. 3: Study of oxygen transfer by reaction kinetics and uptakes of O2 and CO.
From: Understanding oxygen transfer on ceria with Pt single atoms for surface reaction
Reaction rate as a function of (a) CO or (b, c) O2 partial pressure. The O2 partial pressure was 0.5 kPa in (a). CO partial pressure was 1.5 kPa in (b, c) while (b) was measured in O2-deficient condition (PO2 = 0.3-0.7 kPa) and (c) was measured in O2-rich condition (PO2 = 3–3.4 kPa). Reaction orders (nCO or nO2) are estimated from the slopes of linear fitting. O2 uptakes at 500 °C normalized by ceria surface area and illustration of O2 uptake process obtained after H2 pretreatment at (d) 550 °C and (e) 750 °C. Pt/CeO2 was reduced at 900 °C instead of 750 °C. The patterned color represents the difference in the O2 uptakes after H2 pretreatment at 550 °C and 750 °C. f CO uptake at 500°C normalized by ceria surface area. g Illustration of O2 and CO uptake processes of (d–f).
