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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; 27:molecules27041173. [PMID: 35208959 PMCID: PMC8875358 DOI: 10.3390/molecules27041173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 01/29/2022] [Accepted: 02/08/2022] [Indexed: 12/10/2022] Open
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.
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Affiliation(s)
- Evgeny Filatov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (P.S.); (D.P.); (N.K.); (P.P.); (S.K.)
- Correspondence:
| | - Pavel Smirnov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (P.S.); (D.P.); (N.K.); (P.P.); (S.K.)
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia;
| | - Dmitry Potemkin
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia;
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Denis Pishchur
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (P.S.); (D.P.); (N.K.); (P.P.); (S.K.)
| | - Natalya Kryuchkova
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (P.S.); (D.P.); (N.K.); (P.P.); (S.K.)
| | - Pavel Plyusnin
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (P.S.); (D.P.); (N.K.); (P.P.); (S.K.)
| | - Sergey Korenev
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (P.S.); (D.P.); (N.K.); (P.P.); (S.K.)
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Abstract
Methyl formate is a key component for both defossilized industry and mobility. The current industrial production via carbonylation of methanol has various disadvantages such as high requirements on reactant purity and low methanol conversion rates. In addition, there is a great interest in replacing the conventional homogeneous catalyst with a heterogeneous one, among other things to improve the downstream processing. This is why new approaches for methyl formate are sought. This review summarizes promising approaches for methyl formate production using methanol as a reactant.
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Copper carbene complexes. Synthesis and structural analysis of a chloro-bridged dicopper cation and the triosmium-copper carbene cluster complex HOs3(CO)11[µ-Cu(IPr)]. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Wisniewska J, Sobczak I, Ziolek M. The effect of the calcium dopant on the activity and selectivity of gold catalysts supported on SBA-15 and Nb-containing SBA-15 in methanol oxidation. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02135k] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gold catalysts based on SBA-15, NbSBA-15 (Nb introduced in one pot synthesis) and Nb2O5/SBA-15 (prepared by impregnation of SBA-15) were doped with calcium species introduced before Au loading and were tested in gas-phase methanol oxidation.
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Affiliation(s)
- Joanna Wisniewska
- Faculty of Chemistry
- Adam Mickiewicz University, Poznań
- 61-614 Poznań
- Poland
| | - Izabela Sobczak
- Faculty of Chemistry
- Adam Mickiewicz University, Poznań
- 61-614 Poznań
- Poland
| | - Maria Ziolek
- Faculty of Chemistry
- Adam Mickiewicz University, Poznań
- 61-614 Poznań
- Poland
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Yang M, Lu F, Zhou T, Zhao J, Ding C, Fakhri A, Gupta VK. Biosynthesis of nano bimetallic Ag/Pt alloy from Crocus sativus L. extract: Biological efficacy and catalytic activity. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2020; 212:112025. [PMID: 32977113 DOI: 10.1016/j.jphotobiol.2020.112025] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 09/05/2020] [Accepted: 09/09/2020] [Indexed: 01/11/2023]
Abstract
In this project, silver‑platinum (AgPt) nanoparticles were prepared by using the Crocus sativus L. plant ethanolic extract. The AgPt nanoparticles were characterized by applying the various method as ultraviolet-visible and infrared spectroscopy, electron microscopy, and X-ray diffraction analysis. The morphology structural indicated that the AgPt nanoparticles were spherical particles with diameter about 36.0 nm. The FTIR spectroscopy shows the efficient stabilization of the AgPt nanoparticles by phytoconstituents. The Ag and AgPt nanoparticles have polyphenolic content, lower than the flavonoids and proanthocyanins contents. The AgPt nanoparticles depicted the highest antioxidant properties compared to the Ag nanoparticles and ascorbic acid. The results showed that the AgPt nanoparticles had a high antioxidant properties. In addition, the AgPt nanoparticles demonstrated the substantial antimicrobial and cytotoxic activities against pathogenic microbes and MCF-7 breast cancer cell line. The environmental chemistry analysis depicts that methyl orange can be degraded from water by catalytic degradation process with sodium borohydride. The AgPt nanoparticles were prosperous in catalytic degrading methyl orange following a first order kinetic model.
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Affiliation(s)
- Min Yang
- School of Traditional Chinese Medicine, Changchun University of Chinese Medicine, Changchun 130017, China; School of Traditional Chinese Materia Medica, Jilin Agricultural Science and Technology University, Jilin 132101, China
| | - Fang Lu
- Department of Clinical Pathology, Jilin Kingmed for Clinical Laboratory Co., Ltd, Changchun 130000, China
| | - Tingting Zhou
- Department of Clinical Pathology, Jilin Kingmed for Clinical Laboratory Co., Ltd, Changchun 130000, China
| | - Jianjun Zhao
- Department of Encephalology, Affiliated Hospital of Changchun University of Chinese Medicine, Changchun 130021, China.
| | - Chuanbo Ding
- School of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, China.
| | - Ali Fakhri
- Department of Chemistry, Nano Smart Science Institute, Tehran, Iran.
| | - Vinod Kumar Gupta
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
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Wisniewska J, Dziedzic I, Ziolek M. A platinum promoted Ag/SBA-15 catalyst effective in selective oxidation of methanol - design and surface characterization. RSC Adv 2020; 10:14570-14580. [PMID: 35497122 PMCID: PMC9051898 DOI: 10.1039/d0ra01562h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 04/02/2020] [Indexed: 02/04/2023] Open
Abstract
The aim of this study was better understanding of surface properties of bimetallic (silver-platinum) catalysts and to verify if a very small addition of platinum (ca. 0.05 wt%) to silver (ca. 2.0 wt%) loaded on ordered mesoporous silica, SBA-15, would improve the catalytic properties of bimetallic Ag-Pt materials in selective oxidation of methanol to methyl formate. Ag-Pt catalysts were prepared by one-step and step-by-step procedures and the final Ag/Pt molar ratio in the respective samples was equal to 86 and 63. The catalysts were characterized after calcination and different activation treatments (in Ar and O2). X-ray diffraction, UV-vis and XP spectroscopy confirmed the lack of Ag-Pt alloy crystallites in the samples and also evidenced a higher resistance of silver oxide species to reduction upon activation in Ar flow in the presence of platinum promoter interacting with silver species. Methanol oxidation over the samples activated in Ar flow and in oxidizing flow (O2 + Ar) helped identify the role of each component in the bimetallic Ag-Pt catalyst in terms of activity and selectivity in the oxidation of methanol to methyl formate. A highly active bimetallic Pt/Ag/SBA-15 catalyst, selective to methyl formate and stable in methanol oxidation was constructed.
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Affiliation(s)
- Joanna Wisniewska
- Faculty of Chemistry, Adam Mickiewicz University in Poznań Uniwersytetu Poznańskiego 8 61-614 Poznań Poland +48 61 8291794
| | - Izabela Dziedzic
- Faculty of Chemistry, Adam Mickiewicz University in Poznań Uniwersytetu Poznańskiego 8 61-614 Poznań Poland +48 61 8291794
| | - Maria Ziolek
- Faculty of Chemistry, Adam Mickiewicz University in Poznań Uniwersytetu Poznańskiego 8 61-614 Poznań Poland +48 61 8291794
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Heterometallic nitrido cluster compounds: Synthesis and characterizations of the first nitrido-containing ruthenium-gold and ruthenium-copper carbonyl cluster complexes. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.120872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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