3D Ridge-Valley Structure of a Pt-Ceria Catalyst: HRTEM and EELS Spectrum Imaging

• Published in: Catalysis letters Vol. 132; no. 3-4; pp. 335 - 341
• Main Authors: Graham, Uschi M, Khatri, Rajesh A, Dozier, Alan, Jacobs, Gary, Davis, Burtron H
• Format: Journal Article
• Language: English
• Published: Boston Boston : Springer US 01.10.2009; Springer US; Springer; Springer Nature B.V
• Subjects: Catalysis; Catalysts; Cerium oxides; Chemistry; Chemistry and Materials Science; Colloidal state and disperse state; Crystal structure; Eels; Exact sciences and technology; General and physical chemistry; Industrial Chemistry/Chemical Engineering; Morphology; Nanocrystals; Nanoparticles; Organometallic Chemistry; Oxidation; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Physical Chemistry; Platinum; Self alignment; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Valence; Valleys; Platinum; Oxidation state; Catalyst supports; Ceria; EELS; Water–gas-shift; HRTEM; Binary compound; Nanoparticle; Water gas; Crystals; Transition metal; Cerium oxide; Lanthanide compound; Heterogeneous catalysis; Transmission electron microscopy; Imaging; Morphology; Preparation; Oxidation; Structure; Catalyst; Water-gas-shift; Catalyst support
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-009-0140-7

Nano-ridge and valley structures formed as a result of self-aligned individual ceria nano-crystals, and HRSTEM/EELS revealed the 3-dimensional morphology profiles of the ridge and valley structures of the ceria support. After preparation of a Pt/ceria catalyst, HRSTEM indicated the preferential alignment of Pt nanoparticles inside the nano-valleys of the ceria support. EELS analyses confirmed changes in the oxidation state of ceria in the vicinity of Pt nanoparticles that are present at different depth in the valleys.