Formation of polyhedral ceria nanoparticles with enhanced catalytic CO oxidation activity in thermal plasma via a hydrogen mediated shape control mechanism |
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Authors: | Jie Zheng Yaohua Zhang Xubo Song Xingguo Li |
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Institution: | (1) Beijing National Laboratory for Molecular Sciences (BNLMS) (The State Key Laboratory of Rare Earth Materials Chemistry and Applications), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, People’s Republic of China; |
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Abstract: | Ceria nanoparticles with well defined facets are prepared in argon–hydrogen thermal plasma followed by controlled oxidation.
With increasing hydrogen fraction in the plasma, a clear sphere-to-polyhedron shape transition is observed. The heat released
during the hydrogenation of cerium, which significantly enhances the species mobility on the surface, favors the growth of
well defined facets. The polyhedron ceria nanoparticles, though lower in specific surface area, exhibit superior catalytic
performance for CO oxidation over the round particles, which is attributed to the higher density of the reactive {200} and
{220} facets on the surface. The hydrogen mediated shape control mechanism provides new insights into the shape control of
nanoparticles during thermal plasma processing. |
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Keywords: | |
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