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Exposed Surfaces on Shape‐Controlled Ceria Nanoparticles Revealed through AC‐TEM and Water–Gas Shift Reactivity
Author(s) -
Agarwal Shilpa,
Lefferts Leon,
Mojet Barbara L.,
Ligthart D. A. J. Michel,
Hensen Emiel J. M.,
Mitchell David R. G.,
Erasmus Willem J.,
Anderson Bruce G.,
Olivier Ezra J.,
Neethling Johannes H.,
Datye Abhaya K.
Publication year - 2013
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300651
Subject(s) - reactivity (psychology) , rod , octahedron , fourier transform infrared spectroscopy , transmission electron microscopy , spectroscopy , nanoparticle , materials science , catalysis , infrared spectroscopy , chemistry , crystallography , chemical engineering , nanotechnology , crystal structure , organic chemistry , medicine , alternative medicine , physics , pathology , quantum mechanics , engineering
Aberration‐corrected transmission electron microscopy and high‐angle annular dark field imaging was used to investigate the surface structures and internal defects of CeO 2 nanoparticles (octahedra, rods, and cubes). Further, their catalytic reactivity in the water–gas shift (WGS) reaction and the exposed surface sites by using FTIR spectroscopy were tested. Rods and octahedra expose stable (111) surfaces whereas cubes have primarily (100) facets. Rods also had internal voids and surface steps. The exposed planes are consistent with observed reactivity patterns, and the normalized WGS reactivity of octahedra and rods were similar, but the cubes were more reactive. In situ FTIR spectroscopy showed that rods and octahedra exhibit similar spectra for OH groups and that carbonates and formates formed upon exposure to CO whereas for cubes clear differences were observed. These results provide definitive information on the nature of the exposed surfaces in these CeO 2 nanostructures and their influence on the WGS reactivity.