Tracking the shape-dependent sintering of platinum-rhodium model catalysts under operando conditions.
(2016) In Nature Communications 7.- Abstract
- Nanoparticle sintering during catalytic reactions is a major cause for catalyst deactivation. Understanding its atomic-scale processes and finding strategies to reduce it is of paramount scientific and economic interest. Here, we report on the composition-dependent three-dimensional restructuring of epitaxial platinum-rhodium alloy nanoparticles on alumina during carbon monoxide oxidation at 550 K and near-atmospheric pressures employing in situ high-energy grazing incidence x-ray diffraction, online mass spectrometry and a combinatorial sample design. For platinum-rich particles our results disclose a dramatic reaction-induced height increase, accompanied by a corresponding reduction of the total particle surface coverage. We find this... (More)
- Nanoparticle sintering during catalytic reactions is a major cause for catalyst deactivation. Understanding its atomic-scale processes and finding strategies to reduce it is of paramount scientific and economic interest. Here, we report on the composition-dependent three-dimensional restructuring of epitaxial platinum-rhodium alloy nanoparticles on alumina during carbon monoxide oxidation at 550 K and near-atmospheric pressures employing in situ high-energy grazing incidence x-ray diffraction, online mass spectrometry and a combinatorial sample design. For platinum-rich particles our results disclose a dramatic reaction-induced height increase, accompanied by a corresponding reduction of the total particle surface coverage. We find this restructuring to be progressively reduced for particles with increasing rhodium composition. We explain our observations by a carbon monoxide oxidation promoted non-classical Ostwald ripening process during which smaller particles are destabilized by the heat of reaction. Its driving force lies in the initial particle shape which features for platinum-rich particles a kinetically stabilized, low aspect ratio. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8852966
- author
- Hejral, Uta ; Müller, Patrick ; Balmes, Olivier LU ; Pontoni, Diego and Stierle, Andreas
- organization
- publishing date
- 2016
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Nature Communications
- volume
- 7
- article number
- 10964
- publisher
- Nature Publishing Group
- external identifiers
-
- pmid:26957204
- scopus:84960509989
- wos:000371731000001
- pmid:26957204
- ISSN
- 2041-1723
- DOI
- 10.1038/ncomms10964
- language
- English
- LU publication?
- yes
- id
- 6f9cca82-88bc-4c01-a04c-080aaf59d002 (old id 8852966)
- date added to LUP
- 2016-04-01 15:01:25
- date last changed
- 2022-04-06 21:41:19
@article{6f9cca82-88bc-4c01-a04c-080aaf59d002,
abstract = {{Nanoparticle sintering during catalytic reactions is a major cause for catalyst deactivation. Understanding its atomic-scale processes and finding strategies to reduce it is of paramount scientific and economic interest. Here, we report on the composition-dependent three-dimensional restructuring of epitaxial platinum-rhodium alloy nanoparticles on alumina during carbon monoxide oxidation at 550 K and near-atmospheric pressures employing in situ high-energy grazing incidence x-ray diffraction, online mass spectrometry and a combinatorial sample design. For platinum-rich particles our results disclose a dramatic reaction-induced height increase, accompanied by a corresponding reduction of the total particle surface coverage. We find this restructuring to be progressively reduced for particles with increasing rhodium composition. We explain our observations by a carbon monoxide oxidation promoted non-classical Ostwald ripening process during which smaller particles are destabilized by the heat of reaction. Its driving force lies in the initial particle shape which features for platinum-rich particles a kinetically stabilized, low aspect ratio.}},
author = {{Hejral, Uta and Müller, Patrick and Balmes, Olivier and Pontoni, Diego and Stierle, Andreas}},
issn = {{2041-1723}},
language = {{eng}},
publisher = {{Nature Publishing Group}},
series = {{Nature Communications}},
title = {{Tracking the shape-dependent sintering of platinum-rhodium model catalysts under operando conditions.}},
url = {{http://dx.doi.org/10.1038/ncomms10964}},
doi = {{10.1038/ncomms10964}},
volume = {{7}},
year = {{2016}},
}