Pd-Ce-Ox Species on MWCNTs Surface: Probing the Structure-Activity Correlation in Low-Temperature CO Oxidation
Full article
| Common |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Applied Surface Science
ISSN: 0169-4332
|
| Output data |
Year: 2023,
Volume: 611,
Number: Part B,
Article number
: 155750,
Pages count
: 12
DOI:
10.1016/j.apsusc.2022.155750
|
| Tags |
Palladium; Ceria; MWCNTs; Wet CO oxidation; Metal-support interaction |
| Authors |
Kibis Lidiya S.
1
,
Zadesenets Andrey V.
2
,
Garkul Ilia A.
2
,
Korobova Arina N.
1
,
Kardash Tatyana Yu.
1
,
Fedorova Elizaveta A.
3
,
Slavinskaya Elena M.
1
,
Stonkus Olga A.
1
,
Korenev Sergey V.
2
,
Podyacheva Olga Yu.
1
,
Boronin Andrei I.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, pr. Lavrentieva 5, Novosibirsk 630090, Russia
|
| 2 |
Nikolaev Institute of Inorganic Chemistry, pr. Lavrentieva 3, Novosibirsk 630090, Russia
|
| 3 |
Leibniz Institute for Catalysis, Albert-Einstein Str. 29a, Rostock 18059, Germany
|
|
Funding (1)
|
1
|
Russian Science Foundation
|
21-13-00094
|
Herein, the highly dispersed palladium and ceria species were deposted on the surface of multi-walled carbon nanotubes (MWCNTs) by co-deposition from acetone solutions. The use of MWCNTs allowed varying Pd/Ce atomic ratio in a wide range, while maintaining a high dispersion of the active components. Application of physicochemical methods revealed the formation of various palladium species. Single Pd2+ ions dispersed in CeO2 lattice were the main Pd-Ce-Ox species at low Pdat/Ceat ratio. With an increase of the Pd content in the samples the preferential formation of PdO particles in a tight contact with CeO2 nanoparticles was observed. The size of PdO and CeO2 primary particles was in a range of 1–5 nm.
The Pd-Ce-Ox/MWCNTs samples showed high activity in the CO oxidation reaction already at room temperature with a temperature of 50% CO conversion below 100 °C. The Pd2+-CeO2 and PdO-CeO2 species demonstrated the comparable activity in “dry” CO oxidation. However, the presence of water vapor in the reaction mixture resulted in the immediate deactivation of Pd2+-CeO2 species, while PdO-CeO2 species retained a high activity at 20°С. The results of the work highlight the benefits of MWCNTs, Pd, and CeO2 combination for obtaining catalysts highly active in CO oxidation.