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Open AccessCommunication

Ultra-Small Pd Nanoparticles on Ceria as an Advanced Catalyst for CO Oxidation

1
The Smart Materials Research Institute, Southern Federal University, 344090 Rostov-on-Don, Russia
2
Federal Research Centre the Southern Scientific Center of the Russian Academy of Sciences, 344006 Rostov-on-Don, Russia
3
Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia
4
National University of Science and Technology MISiS, 4 Leninsky prosp., 119991 Moscow, Russia
5
National Research Centre ‘Kurchatov Institute’, 1 Akademika Kurchatova pl., 123182 Moscow, Russia
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(4), 385; https://doi.org/10.3390/catal9040385
Received: 7 March 2019 / Revised: 16 April 2019 / Accepted: 21 April 2019 / Published: 24 April 2019
In this study, we demonstrate the preparation and characterization of small palladium nanoparticles (Pd NPs) on modified ceria support (Pd/CeO2) using wet impregnation and further reduction in an H2/Ar flow. The obtained particles had a good dispersion, but their small size made it difficult to analyze them by conventional techniques such as transmission electron microscopy (TEM) and X-ray powder diffraction (XRPD). The material demonstrated a high catalytic activity in the CO oxidation reaction: the 100% of CO conversion was achieved at ~50 °C, whereas for most of the cited literature, such a high conversion usually was observed near 100 °C or higher for Pd NPs. Diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy in combination with CO probe molecules was used to investigate the size and morphology of NPs and the ceria support. On the basis of the area ratio under the peaks attributed to bridged (B) and linear (L) carbonyls, high-dispersion Pd NPs was corroborated. Obtained results were in good agreement with data of X-ray absorption near edge structure analysis (XANES) and CO chemisorption measurements. View Full-Text
Keywords: catalysts; ultra-small nanoparticles; ceria support; TEPA; CO oxidation; DRIFT spectroscopy; CO probe molecules catalysts; ultra-small nanoparticles; ceria support; TEPA; CO oxidation; DRIFT spectroscopy; CO probe molecules
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Tereshchenko, A.; Polyakov, V.; Guda, A.; Lastovina, T.; Pimonova, Y.; Bulgakov, A.; Tarasov, A.; Kustov, L.; Butova, V.; Trigub, A.; Soldatov, A. Ultra-Small Pd Nanoparticles on Ceria as an Advanced Catalyst for CO Oxidation. Catalysts 2019, 9, 385.

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