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Svintsitskiy DA, Kibis LS, Stadnichenko AI, Koscheev SV, Zaikovskii VI, Boronin AI. Highly Oxidized Platinum Nanoparticles Prepared through Radio-Frequency Sputtering: Thermal Stability and Reaction Probability towards CO. Chemphyschem 2015; 16:3318-24. [DOI: 10.1002/cphc.201500546] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Indexed: 11/12/2022]
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Svintsitskiy DA, Kibis LS, Stadnichenko AI, Slavinskaya EM, Romanenko AV, Fedorova EA, Stonkus OA, Doronkin DE, Marchuk V, Zimina A, Casapu M, Grunwaldt J, Boronin AI. Insight into the Nature of Active Species of Pt/Al
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O
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Catalysts for low Temperature NH
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Oxidation. ChemCatChem 2019. [DOI: 10.1002/cctc.201901719] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Vasilchenko D, Topchiyan P, Berdyugin S, Filatov E, Tkachev S, Baidina I, Komarov V, Slavinskaya E, Stadnichenko A, Gerasimov E. Tetraalkylammonium Salts of Platinum Nitrato Complexes: Isolation, Structure, and Relevance to the Preparation of PtOx/CeO2 Catalysts for Low-Temperature CO Oxidation. Inorg Chem 2019; 58:6075-6087. [DOI: 10.1021/acs.inorgchem.9b00370] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Kibis LS, Svintsitskiy DA, Stadnichenko AI, Slavinskaya EM, Romanenko AV, Fedorova EA, Stonkus OA, Svetlichnyi VA, Fakhrutdinova ED, Vorokhta M, Šmíd B, Doronkin DE, Marchuk V, Grunwaldt JD, Boronin AI. In situ probing of Pt/TiO2 activity in low-temperature ammonia oxidation. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01533d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NAP-XPS and operando XAS study of Pt/TiO2 catalysts shows that Pt0 species stabilized on TiO2 surface have the highest activity at low-temperature NH3 oxidation.
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Kardash TY, Derevyannikova EA, Slavinskaya EM, Stadnichenko AI, Maltsev VA, Zaikovskii AV, Novopashin SA, Boronin AI, Neyman KM. Pt/CeO 2 and Pt/CeSnO x Catalysts for Low-Temperature CO Oxidation Prepared by Plasma-Arc Technique. Front Chem 2019; 7:114. [PMID: 30931295 PMCID: PMC6424011 DOI: 10.3389/fchem.2019.00114] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 02/13/2019] [Indexed: 11/13/2022] Open
Abstract
We applied a method of plasma arc synthesis to study effects of modification of the fluorite phase of ceria by tin ions. By sputtering active components (Pt, Ce, Sn) together with carbon from a graphite electrode in a helium ambient we prepared samples of complex highly defective composite PtCeC and PtCeSnC oxide particles stabilized in a matrix of carbon. Subsequent high-temperature annealing of the samples in oxygen removes the carbon matrix and causes the formation of active catalysts Pt/CeOx and Pt/CeSnOx for CO oxidation. In the presence of Sn, X-Ray Diffraction (XRD) and High-Resolution Transmission Electron Microscopy (HRTEM) show formation of a mixed phase CeSnOx and stabilization of more dispersed species with a fluorite-type structure. These factors are essential for the observed high activity and thermic stability of the catalyst modified by Sn. X-Ray Photoelectron Spectroscopy (XPS) reveals the presence of both Pt2+ and Pt4+ ions in the catalyst Pt/CeOx, whereas only the state Pt2+ of platinum could be detected in the Sn-modified catalyst Pt/CeSnOx. Insertion of Sn ions into the Pt/CeOx lattice destabilizes/reduces Pt4+ cations in the Pt/CeSnOx catalyst and induces formation of strikingly high concentration (up to 50% at.) of lattice Ce3+ ions. Our DFT calculations corroborate destabilization of Pt4+ ions by incorporation of cationic Sn in Pt/CeOx. The presented results show that modification of the fluorite lattice of ceria by tin induces substantial amount of mobile reactive oxygen partly due to affecting geometric parameters of ceria by tin ions.
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Vasilchenko D, Asanova T, Kolesov B, Tsygankova A, Stadnichenko A, Slavinskaya E, Gerasimov E, Lomachenko K, Boronin A, Korenev S. Cerium(III) Nitrate Derived CeO
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Support Stabilising PtO
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Active Species for Room Temperature CO Oxidation. ChemCatChem 2020. [DOI: 10.1002/cctc.201902146] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Kharlamova TS, Salina MV, Svetlichnyi VA, Salaev MA, Stadnichenko AI, Mamontov GV. CeO2-supported Pt–Ag bimetallic catalysts for 4-nitrophenol reduction. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.08.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Golovanov IS, Malykhin RS, Lesnikov VK, Nelyubina YV, Novikov VV, Frolov KV, Stadnichenko AI, Tretyakov EV, Ioffe SL, Sukhorukov AY. Revealing the Structure of Transition Metal Complexes of Formaldoxime. Inorg Chem 2021; 60:5523-5537. [PMID: 33826845 DOI: 10.1021/acs.inorgchem.0c03362] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Aerobic reactions of iron(III), nickel(II), and manganese(II) chlorides with formaldoxime cyclotrimer (tfoH3) and 1,4,7-triazacyclononane (tacn) produce indefinitely stable complexes of general formula [M(tacn)(tfo)]Cl. Although the formation of formaldoxime complexes has been known since the end of 19th century and applied in spectrophotometric determination of d-metals (formaldoxime method), the structure of these coordination compounds remained elusive until now. According to the X-ray analysis, [M(tacn)(tfo)]+ cation has a distorted adamantane-like structure with the metal ion being coordinated by three oxygen atoms of deprotonated tfoH3 ligand. The metal has a formal +4 oxidation state, which is atypical for organic complexes of iron and nickel. Electronic structure of [M(tacn)(tfo)]+ cations was studied by XPS, NMR, cyclic (CV) and differential pulse (DPV) voltammetries, Mössbauer spectroscopy, and DFT calculations. Unusual stabilization of high-valent metal ion by tfo3- ligand was explained by the donation of electron density from the nitrogen atom to the antibonding orbital of the metal-oxygen bond via hyperconjugation as confirmed by the NBO analysis. All complexes [M(tacn)(tfo)]Cl exhibited high catalytic activity in the aerobic dehydrogenative dimerization of p-thiocresol under ambient conditions.
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Slavinskaya EM, Stadnichenko AI, Quinlivan Domínguez JE, Stonkus OA, Vorokhta M, Šmíd B, Castro-Latorre P, Bruix A, Neyman KM, Boronin AI. States of Pt/CeO2 catalysts for CO oxidation below room temperature. J Catal 2023. [DOI: 10.1016/j.jcat.2023.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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Stonkus OA, Zadesenets AV, Slavinskaya EM, Stadnichenko AI, Svetlichnyi VA, Shubin YV, Korenev SV, Boronin AI. Pd/CeO2-SnO2 catalysts with varying tin content: Promotion of catalytic properties and structure modification. CATAL COMMUN 2022. [DOI: 10.1016/j.catcom.2022.106554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Stonkus O, Kibis L, Slavinskaya E, Zadesenets A, Garkul I, Kardash T, Stadnichenko A, Korenev S, Podyacheva O, Boronin A. Pd-Ceria/CNMs Composites as Catalysts for CO and CH 4 Oxidation. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4257. [PMID: 37374441 DOI: 10.3390/ma16124257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023]
Abstract
The application of composite materials as catalysts for the oxidation of CO and other toxic compounds is a promising approach for air purification. In this work, the composites comprising palladium and ceria components supported on multiwall carbon nanotubes, carbon nanofibers and Sibunit were studied in the reactions of CO and CH4 oxidation. The instrumental methods showed that the defective sites of carbon nanomaterials (CNMs) successfully stabilize the deposited components in a highly-dispersed state: PdO and CeO2 nanoparticles, subnanosized PdOx and PdxCe1-xO2-δ clusters with an amorphous structure, as well as single Pd and Ce atoms, are formed. It was shown that the reactant activation process occurs on palladium species with the participation of oxygen from the ceria lattice. The presence of interblock contacts between PdO and CeO2 nanoparticles has an important effect on oxygen transfer, which consequently affects the catalytic activity. The morphological features of the CNMs, as well as the defect structure, have a strong influence on the particle size and mutual stabilization of the deposited PdO and CeO2 components. The optimal combination of highly dispersed PdOx and PdxCe1-xO2-δ species, as well as PdO nanoparticles in the CNTs-based catalyst, makes it highly effective in both studied oxidation reactions.
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