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Gavrikov AV, Loktev AS, Ilyukhin AB, Mukhin IE, Bykov MA, Maslakov KI, Vorobei AM, Parenago OO, Sadovnikov AA, Dedov AG. Supercritical fluid-assisted modification combined with the resynthesis of SmCoO 3 as an effective tool to enhance the long-term performance of SmCoO 3-derived catalysts for the dry reforming of methane to syngas. Dalton Trans 2022; 51:18446-18461. [PMID: 36416592 DOI: 10.1039/d2dt03026h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The dry reforming of methane to syngas (DRM) is of increasing significance concerning, first, the production of raw materials for commercial organic/petrochemical syntheses and for hydrogen energetic, and, second, the utilization of two most harmful greenhouse gases. Herein, new SmCoO3-based DRM catalysts derived from heterometallic precursors and operated without preliminary reduction are reported. For the first time, the effect of supercritical fluids-assisted modification of the SmCoO3-derived catalysts combined with the re-oxidation of spent catalysts to SmCoO3 onto its long-term performance was studied. In particular, the modification of heterometallic precursors by supercritical antisolvent precipitation (SAS) considerably decreases coke formation upon the exploitation of the derived SmCoO3 sample. Moreover, the re-oxidation of the corresponding spent catalysts followed by pre-heating under N2 affords catalysts that stably provide syngas yields of 88-95% for at least 41 h at 900 °C. The achieved yields are among the highest ones currently reported for DRM catalysts derived from both LnMO3 perovskites and related oxides. The origins of such good performance are discussed. Given the simplicity and availability of all the applied methods and chemicals, this result opens prospects for exploiting SAS in the design of efficient DRM catalysts.
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Affiliation(s)
- Andrey V Gavrikov
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation.
| | - Alexey S Loktev
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation. .,National University of Oil and Gas "Gubkin University", Moscow, Russian Federation.,A.V. Topchiev Institute of Petrochemical Synthesis, RAS, Moscow, Russian Federation
| | - Andrey B Ilyukhin
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation.
| | - Igor E Mukhin
- National University of Oil and Gas "Gubkin University", Moscow, Russian Federation
| | - Mikhail A Bykov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Konstantin I Maslakov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Anton M Vorobei
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation.
| | - Olga O Parenago
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation.
| | - Alexey A Sadovnikov
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation. .,A.V. Topchiev Institute of Petrochemical Synthesis, RAS, Moscow, Russian Federation
| | - Alexey G Dedov
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation. .,National University of Oil and Gas "Gubkin University", Moscow, Russian Federation.,A.V. Topchiev Institute of Petrochemical Synthesis, RAS, Moscow, Russian Federation
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Dedov AG, Loktev AS, Gavrikov AV, Bykov MA, Mukhin IE, Ilyukhin AB. A New Method to Prepare Ni/La2O3 Nanocomposites—Efficient Catalysts for the Partial Oxidation of Methane into Syngas. DOKLADY CHEMISTRY 2022. [DOI: 10.1134/s0012500822600328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Mononuclear Transition Metal Cymantrenecarboxylates as Precursors for Spinel-Type Manganites. Molecules 2022; 27:molecules27031082. [PMID: 35164348 PMCID: PMC8838078 DOI: 10.3390/molecules27031082] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 02/03/2022] [Accepted: 02/04/2022] [Indexed: 02/01/2023] Open
Abstract
Novel mononuclear cymantrenecarboxylate complexes of transition metals, [Co(H2O)6](CymCO2)2·4H2O (Cym = (η5-C5H4)Mn(CO)3) (1), [Ni(H2O)6](CymCO2)2·4H2O (2), [Zn(H2O)6](CymCO2)2·4H2O (3), [Co(CymCO2)2(imz)2] (imz = imidazole, 4), [Co(CymCO2)2(bpy)2]·2PhMe (bpy = 2,2′-bipyridyl, 5), [Ni(CymCO2)(bpy)2(H2O)][CymCO2]·0.5MePh·2H2O (6), [Cu(CymCO2)2(imz)2] (7), and [Cu(CymCO2)2(bpy)(H2O)] (8), were obtained and characterized by single-crystal X-ray analysis. Complexes 1–3 are isostructural. Magnetism of the Co complexes 1, 4, and 5 was studied; it was shown that they exhibit the properties of field-induced single-molecule magnets with magnetization reversal barriers (ΔE/kB) of 44, 13, and 10 K, respectively. Thermal decomposition of complexes 1–8 was studied by means of DSC and TGA methods. The final products of thermolysis of 1–6 in air, according to powder XRD data, are the pure spinel phases MMn2O4; for the cases of copper complexes, the mixtures of CuMn2O4 and CuO were found in the products.
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