Journal
CHEMSUSCHEM
Volume 6, Issue 10, Pages 1898-1906Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201300651
Keywords
ceria; heterogeneous catalysis; nanoparticles; aberration-corrected TEM; water-gas shift reaction
Funding
- National Research Foundation, Sasol
- Department of Science and Technology in South Africa
- DOE [DE-FG02-05ER15712]
- NSF [OISE 0730277]
- ADEM Innovation Lab [30961318]
- Netherlands Institute for Catalysis Research (NIOK)
Ask authors/readers for more resources
Aberration-corrected transmission electron microscopy and high-angle annular dark field imaging was used to investigate the surface structures and internal defects of CeO2 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 CeO2 nanostructures and their influence on the WGS reactivity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available