SCHOLARLY PUBLICATION

Raman Analysis of Mode Softening in Nanoparticle CeO 2−δ and Au-CeO 2−δ during CO Oxidation

Youjin Lee, Guanghui He, Austin J. Akey, Rui Si, Maria Flytzani‐Stephanopoulos, Irving P. Herman

📖 Journal of the American Chemical Society → 📅 2011-07-22 🔗 DOI: 10.1021/ja204479j

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📄 Abstract

Oxygen vacancy levels are monitored during the oxidation of CO by CeO(2-δ) nanorods and Au-CeO(2-δ) nanorods, nanocubes, and nanopolyhedra by using Raman scattering. The first-order CeO(2) F(2g) peak near 460 cm(-1) decreases when this reaction is fast (fast reduction and relatively slow reoxidation of the surface), because of the lattice expansion that occurs when Ce(3+) replaces Ce(4+) during oxygen vacancy creation. This shift correlates with reactivity for CO oxidation. Increases in the oxygen deficit δ as large as ~0.04 are measured relative to conditions when the ceria is not reduced.

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