Pd-Ce-Ox/MWCNTs and Pt-Ce-Ox/MWCNTs Composite Materials: Morphology, Microstructure, and Catalytic Properties Full article
| Journal |
Materials
ISSN: 1996-1944 |
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| Output data | Year: 2022, Volume: 15, Number: 21, Article number : 7485, Pages count : 16 DOI: 10.3390/ma15217485 | ||||
| Tags | ceria; MWCNTs; nanocomposites; palladium; platinum | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 21-13-00094 |
Abstract:
The composite nanomaterials based on noble metals, reducible oxides, and nanostructured carbon are considered to be perspective catalysts for many useful reactions. In the present work, multi-walled carbon nanotubes (MWCNTs) were used for the preparation of Pd-Ce-Ox/MWCNTs and Pt-Ce-Ox/MWCNTs catalysts comprising the active components (6 wt%Pd, 6 wt%Pt, 20 wt%CeO2) as highly dispersed nanoparticles, clusters, and single atoms. The application of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) provided analysis of the samples’ morphology and structure at the atomic level. For Pd-Ce-Ox/MWCNTs samples, the formation of PdO nanoparticles with an average crystallite size of ~8 nm was shown. Pt-Ce-Ox/MWCNTs catalysts comprised single Pt2+ ions and PtOx clusters less than 1 nm. A comparison of the catalytic properties of the samples showed higher activity of Pd-based catalysts in CO and CH4 oxidation reactions in a low-temperature range (T50 = 100 °C and T50 = 295 °C, respectively). However, oxidative pretreatment of the samples resulted in a remarkable enhancement of CO oxidation activity of Pt-Ce-Ox/MWCNTs catalyst at T < 20 °C (33% of CO conversion at T = 0 °C), while no changes were detected for the Pd-Ce-Ox/MWCNTs sample. The revealed catalytic effect was discussed in terms of the capability of the Pt-Ce-Ox/MWCNTs system to form unique PtOx clusters providing high catalytic activity in low-temperature CO oxidation.
Cite:
Kibis L.
, Zadesenets A.
, Garkul I.
, Korobova A.
, Kardash T.
, Slavinskaya E.
, Stonkus O.
, Korenev S.
, Podyacheva O.
, Boronin A.
Pd-Ce-Ox/MWCNTs and Pt-Ce-Ox/MWCNTs Composite Materials: Morphology, Microstructure, and Catalytic Properties
Materials. 2022. V.15. N21. 7485 :1-16. DOI: 10.3390/ma15217485 WOS Scopus РИНЦ AN PMID OpenAlex
Pd-Ce-Ox/MWCNTs and Pt-Ce-Ox/MWCNTs Composite Materials: Morphology, Microstructure, and Catalytic Properties
Materials. 2022. V.15. N21. 7485 :1-16. DOI: 10.3390/ma15217485 WOS Scopus РИНЦ AN PMID OpenAlex
Dates:
| Submitted: | Oct 5, 2022 |
| Accepted: | Oct 21, 2022 |
| Published online: | Oct 25, 2022 |
| Published print: | Nov 1, 2022 |
Identifiers:
| Web of science: | WOS:000881400000001 |
| Scopus: | 2-s2.0-85141857634 |
| Elibrary: | 50404627 |
| Chemical Abstracts: | 2022:2868665 |
| PMID: | 36363076 |
| OpenAlex: | W4307551746 |