Probing the Nature of Active Centers in Pt–Cu/TiO2 Catalysts for Selective Ammonia Oxidation Full article
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The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
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| Output data | Year: 2024, Volume: 128, Number: 44, DOI: 10.1021/acs.jpcc.4c06021 | ||||||
| Tags | Bioremediation; Catalytic oxidation; Copper; High resolution transmission electron microscopy; Platinum; Platinum compounds; Redox reactions; X ray diffraction analysis | ||||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 23-23-00322 |
Abstract:
The activity and selectivity of catalytic systems are influenced by many important factors, such as the composition of the surface, the size and structure of the active sites, as well as the oxidation state of the active components. In this study, we investigated the nature of the active components in Pt/TiO2 catalysts for selective ammonia oxidation upon their modification with copper. Analysis using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) revealed that an increase in copper content led to a significant dispersion of platinum particles due to the formation of subnanoscale Pt(Cu)Ox species. Application of temperature-programmed reduction (TPR-H2) and X-ray photoelectron spectroscopy (XPS) techniques provided valuable data on the redox properties of the catalysts. The introduction of copper resulted in a notable increase in the fraction of oxidized platinum. Once reduced, platinum in the composition of the Pt–Cu/TiO2 catalysts was easily reoxidized upon subsequent exposure to oxygen already at room temperature. The Pt–Cu/TiO2 catalysts comprised oxidized copper species, which demonstrated more labile redox behavior at lower temperatures compared to the Cu/TiO2 catalyst. The facilitated redox transitions of the active components contributed to the enhanced selectivity of the Pt–Cu/TiO2 samples toward N2 by affecting the reaction mechanism. The obtained results provide new insights into key aspects governing the effective oxidation of slip ammonia at low temperatures.
Cite:
Kibis L.S.
, Ovsyuk I.Y.
, Popov A.A.
, Svintsitskiy D.A.
, Slavinskaya E.M.
, Stonkus O.A.
, Korenev S.V.
, Boronin A.I.
Probing the Nature of Active Centers in Pt–Cu/TiO2 Catalysts for Selective Ammonia Oxidation
The Journal of Physical Chemistry C. 2024. V.128. N44. DOI: 10.1021/acs.jpcc.4c06021 WOS Scopus РИНЦ OpenAlex
Probing the Nature of Active Centers in Pt–Cu/TiO2 Catalysts for Selective Ammonia Oxidation
The Journal of Physical Chemistry C. 2024. V.128. N44. DOI: 10.1021/acs.jpcc.4c06021 WOS Scopus РИНЦ OpenAlex
Dates:
| Submitted: | Sep 5, 2024 |
| Accepted: | Oct 22, 2024 |
| Published online: | Oct 29, 2024 |
| Published print: | Nov 7, 2024 |
Identifiers:
| Web of science: | WOS:001347186800001 |
| Scopus: | 2-s2.0-85208278042 |
| Elibrary: | 79165011 |
| OpenAlex: | W4403855236 |
Citing:
| DB | Citing |
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| OpenAlex | 1 |