Formation of Catalytically Active Nanoparticles under Thermolysis of Silver Chloroplatinate(II) and Chloroplatinate(IV) Full article
| Journal |
Molecules
ISSN: 1420-3049 |
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| Output data | Year: 2022, Volume: 27, Number: 4, Article number : 1173, Pages count : 15 DOI: 10.3390/molecules27041173 | ||||||
| Tags | thermolysis; silver; platinum; solid solution of metals; CO PROX | ||||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 121031700315–2 |
| 2 | Russian Science Foundation | 21-73-20203 |
Abstract:
The thermal behaviour of Ag2[PtCl4] and Ag2[PtCl6] complex salts in inert and reducing
atmospheres has been studied. The thermolysis of compounds in a helium atmosphere is shown
to occur in two stages. At the first stage, the complexes decompose in the temperature range of
350–500 C with the formation of platinum and silver chloride and the release of chlorine gas.
At the second stage, silver chloride is sublimated in the temperature range of 700–900 C, while
metallic platinum remains in the solid phase. In contrast to the thermolysis of Ag2[PtCl6], the
thermal decomposition of Ag2[PtCl4] at 350 C is accompanied by significant heat release, which
is associated with disproportionation of the initial salt to Ag2[PtCl6], silver chloride, and platinum
metal. It is confirmed by DSC measurements, DFT calculations of a suggested reaction, and XRD. The thermolysis of Ag2[PtCl4] and Ag2[PtCl6] compounds is shown to occur in a hydrogen atmosphere in two poorly separable steps. The compounds are decomposed within 170–350 C, and silver and platinum are reduced to a metallic state, while a metastable single-phase solid solution of Ag0.67Pt0.33 is formed. The catalytic activity of the resulting nanoalloy Ag0.67Pt0.33 is studied in the reaction of CO total (TOX) and preferential (PROX) oxidation. Ag0.67Pt0.33 enhanced Pt nano-powder activity in CO TOX, but was not selective in CO PROX.
Cite:
Filatov E.
, Smirnov P.
, Potemkin D.
, Pishchur D.
, Kryuchkova N.
, Plyusnin P.
, Korenev S.
Formation of Catalytically Active Nanoparticles under Thermolysis of Silver Chloroplatinate(II) and Chloroplatinate(IV)
Molecules. 2022. V.27. N4. 1173 :1-15. DOI: 10.3390/molecules27041173 WOS Scopus РИНЦ OpenAlex
Formation of Catalytically Active Nanoparticles under Thermolysis of Silver Chloroplatinate(II) and Chloroplatinate(IV)
Molecules. 2022. V.27. N4. 1173 :1-15. DOI: 10.3390/molecules27041173 WOS Scopus РИНЦ OpenAlex
Dates:
| Submitted: | Dec 24, 2021 |
| Accepted: | Feb 8, 2022 |
| Published print: | Feb 9, 2022 |
| Published online: | Feb 9, 2022 |
Identifiers:
| Web of science: | WOS:000764302000001 |
| Scopus: | 2-s2.0-85124599183 |
| Elibrary: | 48150895 |
| OpenAlex: | W4221028940 |