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Gromilov SA, Chepurov AI, Volodin AM, Vedyagin AA. Solid-State Transformations of Mayenite and Core-Shell Structures of C12A7@C Type at High Pressure, High Temperature Conditions. Materials (Basel) 2023; 16:2083. [PMID: 36903198 PMCID: PMC10004160 DOI: 10.3390/ma16052083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 02/21/2023] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
Calcium aluminate of a mayenite structure, 12CaO∙7Al2O3 (C12A7), is widely applicable in many fields of modern science and technology. Therefore, its behavior under various experimental conditions is of special interest. The present research aimed to estimate the possible impact of the carbon shell in core-shell materials of C12A7@C type on the proceeding of solid-state reactions of mayenite with graphite and magnesium oxide under High Pressure, High Temperature (HPHT) conditions. The phase composition of the solid-state products formed at a pressure of 4 GPa and temperature of 1450 °C was studied. As is found, the interaction of mayenite with graphite under such conditions is accompanied by the formation of an aluminum-rich phase of the CaO∙6Al2O3 composition, while in the case of core-shell structure (C12A7@C), the same interaction does not lead to the formation of such a single phase. For this system, a number of hardly identified calcium aluminate phases along with the carbide-like phrases have appeared. The main product of the interaction of mayenite and C12A7@C with MgO under HPHT conditions is the spinel phase Al2MgO4. This indicates that, in the case of the C12A7@C structure, the carbon shell is not able to prevent the interaction of the oxide mayenite core with magnesium oxide located outside the carbon shell. Nevertheless, the other solid-state products accompanying the spinel formation are significantly different for the cases of pure C12A7 and C12A7@C core-shell structure. The obtained results clearly illustrate that the HPHT conditions used in these experiments lead to the complete destruction of the mayenite structure and the formation of new phases, which compositions differ noticeably depending on the precursor used-pure mayenite or C12A7@C core-shell structure.
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Affiliation(s)
- Sergey A. Gromilov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Pr. Lavrentieva 3, 630090 Novosibirsk, Russia
| | - Anatoly I. Chepurov
- V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Pr. Akademika Koptyuga 3, 630090 Novosibirsk, Russia
| | - Alexander M. Volodin
- Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Pr. Lavrentieva 5, 630090 Novosibirsk, Russia
| | - Aleksey A. Vedyagin
- Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Pr. Lavrentieva 5, 630090 Novosibirsk, Russia
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Volodin AM, Kenzhin RM, Bauman YI, Afonnikova SD, Potylitsyna AR, Shubin YV, Mishakov IV, Vedyagin AA. Comparative Study on Carbon Erosion of Nickel Alloys in the Presence of Organic Compounds under Various Reaction Conditions. Materials (Basel) 2022; 15:9033. [PMID: 36556837 PMCID: PMC9787419 DOI: 10.3390/ma15249033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 12/14/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
The processes of carbon erosion of nickel alloys during the catalytic pyrolysis of organic compounds with the formation of carbon nanofibers in a flow-through reactor as well as under reaction conditions in a close volume (Reactions under Autogenic Pressure at Elevated Temperature, RAPET) were studied. The efficiency of the ferromagnetic resonance method to monitor the appearance of catalytically active nickel particles in these processes has been shown. As found, the interaction of bulk Ni-Cr alloy with the reaction medium containing halogenated hydrocarbons (1,2-dichloroethane, 1-iodobutane, 1-bromobutane) results in the appearance of ferromagnetic particles of similar dimensions (~200-300 nm). In the cases of hexachlorobenzene and hexafluorobenzene, the presence of a hydrogen source (hexamethylbenzene) in the reaction mixture was shown to be highly required. The microdispersed samples of Ni-Cu and Ni-Mo alloys were prepared by mechanochemical alloying of powders and by reductive thermolysis of salts-precursors, accordingly. Their interaction with polymers (polyethylene and polyvinyl chloride) under RAPET conditions and with ethylene and 1,2-dichloroethane in a flow-through reactor are comparatively studied as well. According to microscopic data, the morphology of the formed carbon nanofibers is affected by the alloy composition and by the nature of the used organic substrate.
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Affiliation(s)
- Alexander M. Volodin
- Boreskov Institute of Catalysis SB RAS, 5 Lavrentyev ave., 630090 Novosibirsk, Russia
| | - Roman M. Kenzhin
- Boreskov Institute of Catalysis SB RAS, 5 Lavrentyev ave., 630090 Novosibirsk, Russia
| | - Yury I. Bauman
- Boreskov Institute of Catalysis SB RAS, 5 Lavrentyev ave., 630090 Novosibirsk, Russia
| | - Sofya D. Afonnikova
- Boreskov Institute of Catalysis SB RAS, 5 Lavrentyev ave., 630090 Novosibirsk, Russia
| | - Arina R. Potylitsyna
- Boreskov Institute of Catalysis SB RAS, 5 Lavrentyev ave., 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 2 Pirogova str., 630090 Novosibirsk, Russia
| | - Yury V. Shubin
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentyev ave., 630090 Novosibirsk, Russia
| | - Ilya V. Mishakov
- Boreskov Institute of Catalysis SB RAS, 5 Lavrentyev ave., 630090 Novosibirsk, Russia
| | - Aleksey A. Vedyagin
- Boreskov Institute of Catalysis SB RAS, 5 Lavrentyev ave., 630090 Novosibirsk, Russia
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Volodin AM, Kenzhin RM, Kapishnikov AV, Komarovskikh AY, Vedyagin AA. Aluminothermic Synthesis of Dispersed Electrides Based on Mayenite: XRD and EPR Study. Materials (Basel) 2022; 15:8988. [PMID: 36556802 PMCID: PMC9781158 DOI: 10.3390/ma15248988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 12/13/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
The evolution of the structure and the phase composition of a dispersed mayenite at its interaction with metallic aluminum was studied in a temperature range from 900 to 1400 °C in both argon and air atmospheres. The aluminum loading was varied from 0 to 50 wt%. It was found that the addition of aluminum significantly affects the stability of the mayenite and other calcium aluminate phases within the studied temperature range. The formation of the electride state registered by the appearance of a characteristic electron paramagnetic resonance (EPR) signal from F+-like centers (g~1.994) in an argon atmosphere was shown to take place already at 1150 °C due to an aluminothermic reduction of this material. The super-narrow (Hp-p < 0.5 G) EPR spectra from F+-like centers, which were recently observed for the core−shell structures of the C12A7@C type only, were registered for mayenite for the first time. The results obtained in the present study testify firstly towards the possibility of significantly diminishing the temperatures required for the formation of the electride state in such systems and secondly towards the ability to stabilize the size of small electride nanoparticles within the synthesized calcium aluminate matrix.
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Affiliation(s)
| | - Roman M. Kenzhin
- Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Aleksandr V. Kapishnikov
- Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
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Yushkov ID, Kamaev GN, Volodin VA, Geydt PV, Kapishnikov AV, Volodin AM. Resistance Switching in Polycrystalline C12A7 Electride. Micromachines (Basel) 2022; 13:1917. [PMID: 36363938 PMCID: PMC9694022 DOI: 10.3390/mi13111917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/01/2022] [Accepted: 11/04/2022] [Indexed: 06/16/2023]
Abstract
The memory (memristive) properties of an electride material based on polycrystalline mayenite (C12A7:e-) were studied. The phase composition of the material has been confirmed by such methods as XRD, TEM, Raman, and infrared spectroscopy. The electride state was confirmed by conductivity measurements and EPR using a characteristic signal from F+-like centers, but the peak at 186 cm-1, corresponding to an electride with free electrons, was not observed explicitly in the Raman spectra. The temperature dependence of current-voltage characteristics in states with low and high resistance (LRS and HRS) has been studied. In the LRS state, the temperature dependence of the current has a non-Arrhenius character and is described by the Hurd quantum tunnelling model with a Berthelot temperature of 262 K, while in the HRS state, it can be described in terms of the Arrhenius model. In the latter case, the existence of two conduction regions, "impurity" and "intrinsic", with corresponding activation energies of 25.5 and 40.6 meV, was assumed. The difference in conduction mechanisms is most likely associated with a change in the concentration of free electrons.
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Affiliation(s)
- Ivan D Yushkov
- Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str., 2, 630090 Novosibirsk, Russia
- Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave. 13, 630090 Novosibirsk, Russia
| | - Gennadiy N Kamaev
- Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave. 13, 630090 Novosibirsk, Russia
| | - Vladimir A Volodin
- Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str., 2, 630090 Novosibirsk, Russia
- Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave. 13, 630090 Novosibirsk, Russia
| | - Pavel V Geydt
- Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str., 2, 630090 Novosibirsk, Russia
- Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave. 13, 630090 Novosibirsk, Russia
| | - Aleksandr V Kapishnikov
- Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str., 2, 630090 Novosibirsk, Russia
- Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Lavrentieva, 5, 630090 Novosibirsk, Russia
| | - Alexander M Volodin
- Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Lavrentieva, 5, 630090 Novosibirsk, Russia
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Kapishnikov AV, Kenzhin RM, Koskin AP, Volodin AM, Geydt PV. Mayenite Synthesis from Hydroxide Precursors: Structure Formation and Active Sites on Its Surface. Materials 2022; 15:ma15030778. [PMID: 35160729 PMCID: PMC8836596 DOI: 10.3390/ma15030778] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/12/2022] [Accepted: 01/17/2022] [Indexed: 11/16/2022]
Abstract
We studied the formation process of a mayenite structure from hydroxide precursors in different gas media. According to X-ray diffraction data, this method allows a well-crystallized mayenite (Ca12Al14O33 or C12A7) phase to be obtained at low (500–900 °C) temperatures with an insignificant impurity of CaO. It was shown that the lattice parameters for C12A7 obtained in an inert atmosphere (Ar) were lower when compared with similar samples in the air. These results can be explained by the different levels of oxygen nonstoichiometry in the resulting phase. We noted that sintering and crystallization of mayenite proceeds at lower temperatures in Ar than in the air medium. We found the presence of donor and acceptor active sites on the surface of mayenite, which was detected by the spin probe method. The specific (per unit surface) concentration of such sites (2.5 × 1016 m−2 and 1.5 × 1015 m−2 for donor and acceptor sites, respectively) is comparable to that of γ-Al2O3, which is traditionally used as catalyst support. This allows it to be used in adsorption and catalytic technologies, taking into account its high specific surface area (~30–50 m2/g at a low synthesis temperature).
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Affiliation(s)
- Aleksandr V. Kapishnikov
- Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str., 2, 630090 Novosibirsk, Russia;
- Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Lavrentieva, 5, 630090 Novosibirsk, Russia; (A.P.K.); (A.M.V.)
- Correspondence: (A.V.K.); (P.V.G.)
| | - Roman M. Kenzhin
- Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str., 2, 630090 Novosibirsk, Russia;
- Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Lavrentieva, 5, 630090 Novosibirsk, Russia; (A.P.K.); (A.M.V.)
| | - Anton P. Koskin
- Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Lavrentieva, 5, 630090 Novosibirsk, Russia; (A.P.K.); (A.M.V.)
| | - Alexander M. Volodin
- Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Lavrentieva, 5, 630090 Novosibirsk, Russia; (A.P.K.); (A.M.V.)
| | - Pavel V. Geydt
- Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str., 2, 630090 Novosibirsk, Russia;
- Correspondence: (A.V.K.); (P.V.G.)
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Vedyagin AA, Shubin YV, Kenzhin RM, Plyusnin PE, Stoyanovskii VO, Volodin AM. Prospect of Using Nanoalloys of Partly Miscible Rhodium and Palladium in Three-Way Catalysis. Top Catal 2018. [DOI: 10.1007/s11244-018-1093-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Vedyagin AA, Volodin AM, Kenzhin RM, Stoyanovskii VO, Rogov VA, Kriventsov VV, Mishakov IV. The role of chemisorbed water in formation and stabilization of active sites on Pd/Alumina oxidation catalysts. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.01.033] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kenzhin RM, Bauman YI, Volodin AM, Mishakov IV, Vedyagin AA. Interaction of bulk nickel and nichrome with halogenated butanes. Reac Kinet Mech Cat 2017. [DOI: 10.1007/s11144-017-1273-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kenzhin RM, Bauman YI, Volodin AM, Mishakov IV, Vedyagin AA. One-step synthesis of nitrogen-doped carbon nanofibers from melamine over nickel alloy in a closed system. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.07.073] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Vedyagin AA, Volodin AM, Kenzhin RM, Stoyanovskii VO, Shubin YV, Plyusnin PE, Mishakov IV. Effect of metal-metal and metal-support interaction on activity and stability of Pd-Rh/alumina in CO oxidation. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.10.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Stoyanovskii VO, Vedyagin AA, Volodin AM, Kenzhin RM, Shubin YV, Plyusnin PE, Mishakov IV. Peculiarity of Rh bulk diffusion in La-doped alumina and its impact on CO oxidation over Rh/Al2O3. CATAL COMMUN 2017. [DOI: 10.1016/j.catcom.2017.04.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Khabibulin DF, Papulovskiy E, Andreev AS, Shubin AA, Volodin AM, Zenkovets GA, Yatsenko DA, Tsybulya SV, Lapina OB. Surface Hydroxyl OH Defects of η-Al2O3 and χ-Al2O3 by Solid State NMR, XRD, and DFT Calculations. Z PHYS CHEM 2016. [DOI: 10.1515/zpch-2016-0822] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
For the first time, the detailed structure of χ-Al2O3 and η-Al2O3 surface has been established by implementing the NMR crystallography approach. The surface of η-Al2O3 has been demonstrated to be formed primarily by the (111) facets, while the χ-Al2O3 surface is a combination of (111) and (110) facets. This observation supports the block model of aluminum oxides previously proposed by Tsybulya and Kryukova [S. V. Tsybulya, G. N. Kryukova, Phys. Rev. B 77 (2008) 024112.]. The additional terminal OH groups, observed experimentally and not contributing to (111) and (110) theoretical calculations, are considered to be bonded to the tetrahedral aluminum sites. Their origin is related to the junctions of crystallographic faces of spinel building blocks, being a part of discussed model. Higher content of these terminal OH groups in χ-Al2O3 is a result of more junctions in the case of its more mosaic structure compared to η-Al2O3.
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Affiliation(s)
- Dzhalil F. Khabibulin
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russian Federation
| | - Evgeniy Papulovskiy
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russian Federation
| | - Andrey S. Andreev
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russian Federation
| | - Aleksandr A. Shubin
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russian Federation
| | - Alexander M. Volodin
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
| | - Galina A. Zenkovets
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russian Federation
| | - Dmitriy A. Yatsenko
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russian Federation
| | - Sergey V. Tsybulya
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russian Federation
| | - Olga B. Lapina
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russian Federation
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Vedyagin AA, Volodin AM, Kenzhin RM, Chesnokov VV, Mishakov IV. CO Oxidation over Pd/ZrO₂ Catalysts: Role of Support's Donor Sites. Molecules 2016; 21:molecules21101289. [PMID: 27689972 PMCID: PMC6274247 DOI: 10.3390/molecules21101289] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/21/2016] [Accepted: 09/22/2016] [Indexed: 11/24/2022] Open
Abstract
A series of supported Pd/ZrO2 catalysts with Pd loading from 0.2 to 2 wt % was synthesized. The ZrO2 material prepared by a similar technique was used as a reference sample. The samples have been characterized by means of transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), testing reaction of ethane hydrogenolysis (HGE), N2 adsorption, and electron paramagnetic resonance (EPR) spectroscopy. 1,3,5-trinitrobenzene was used as a probe molecule for the EPR spin probe method. The catalytic performance of samples was tested in the model reaction of CO oxidation. It was shown that the concentration of donor sites of support measured by EPR spin probe correlates with catalytic behavior during light-off tests. Low concentration of donor sites on a support’s surface was found to be caused by the presence of the specific surface defects that are related to existence of coordinately unsaturated structures.
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Affiliation(s)
- Aleksey A Vedyagin
- Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian.
- Institute of Natural Resources, National Research Tomsk Polytechnic University, Tomsk 634050, Russian.
| | | | - Roman M Kenzhin
- Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian.
| | | | - Ilya V Mishakov
- Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian.
- Institute of Power Engineering, National Research Tomsk Polytechnic University, Tomsk 634050, Russian.
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Vedyagin AA, Volodin AM, Stoyanovskii VO, Kenzhin RM, Plyusnin PE, Shubin YV, Mishakov IV. Effect of Alumina Phase Transformation on Stability of Low-Loaded Pd-Rh Catalysts for CO Oxidation. Top Catal 2016. [DOI: 10.1007/s11244-016-0726-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Vedyagin AA, Volodin AM, Stoyanovskii VO, Kenzhin RM, Slavinskaya EM, Mishakov IV, Plyusnin PE, Shubin YV. Stabilization of active sites in alloyed Pd–Rh catalysts on γ-Al2O3 support. Catal Today 2014. [DOI: 10.1016/j.cattod.2014.02.056] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Koshevoy EI, Mikenas TB, Zakharov VA, Volodin AM, Kenzhin RM. Formation of isolated titanium(III) ions in superactive titanium–magnesium catalysts with a low titanium content as active sites in ethylene polymerization. CATAL COMMUN 2014. [DOI: 10.1016/j.catcom.2014.01.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Vedyagin AA, Gavrilov MS, Volodin AM, Stoyanovskii VO, Slavinskaya EM, Mishakov IV, Shubin YV. Catalytic Purification of Exhaust Gases Over Pd–Rh Alloy Catalysts. Top Catal 2013. [DOI: 10.1007/s11244-013-0064-8] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Medvedev DA, Rybinskaya AA, Kenzhin RM, Volodin AM, Bedilo AF. Characterization of electron donor sites on Al2O3 surface. Phys Chem Chem Phys 2012; 14:2587-98. [DOI: 10.1039/c2cp20863f] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zotov RA, Molchanov VV, Volodin AM, Bedilo AF. Characterization of the active sites on the surface of Al2O3 ethanol dehydration catalysts by EPR using spin probes. J Catal 2011. [DOI: 10.1016/j.jcat.2010.11.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Mishakov IV, Zaikovskii VI, Heroux DS, Bedilo AF, Chesnokov VV, Volodin AM, Martyanov IN, Filimonova SV, Parmon VN, Klabunde KJ. CF2Cl2 Decomposition over Nanocrystalline MgO: Evidence for Long Induction Periods. J Phys Chem B 2005; 109:6982-9. [PMID: 16851793 DOI: 10.1021/jp047847s] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
CF(2)Cl(2) has been found to react with nanoscale MgO at 325 degrees C and higher temperatures. In excess of the halocarbon, the reaction results in the formation of MgF(2) as a predominant solid product, with CCl(4), and CO(2) formed as the main gaseous products. The kinetics of the process is characterized by a prolonged induction period, which is as long as 8.5 h at 325 degrees C. The length of the induction period decreases with temperature increase and becomes negligible at 500 degrees C. Complete CF(2)Cl(2) mineralization has been achieved in an excess of MgO at 450 degrees C. Detailed HRTEM and EDX analysis has shown that the induction period involves the formation of small amounts of magnesium halides on the oxide surface and results in its reconstruction leading to initial oriental ordering of the nanocrystals followed by substantial changes in the bulk composition of the nanoparticles. The reaction proved to be structurally sensitive. It has been found that deep fluoridation is possible only for nanoscale MgO samples. The use of samples with lower surface areas results in lengthening of the induction period and decrease of the reaction depth. The MgO transformation to MgF(2) has been found to result in a surface area decrease by more that an order of magnitude as a result of intense sintering of magnesium fluoride under the reaction conditions.
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Bedilo AF, Plotnikov MA, Mezentseva NV, Volodin AM, Zhidomirov GM, Rybkin IM, Klabunde KJ. Superoxide radical anions on the surface of zirconia and sulfated zirconia: formation mechanisms, properties and structure. Phys Chem Chem Phys 2005; 7:3059-69. [PMID: 16186911 DOI: 10.1039/b504262c] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In situ ESR spectroscopy has been used for direct comparison of different thermal and light-induced processes leading to generation of superoxide radical anions on the surface of various zirconia and sulfated zirconia materials. For materials of both types the magnetic resonance parameters of the radical anions were found to be practically independent of the generation method, except for oxygen coadsorption with NO that yields radicals with somewhat smaller gz values. The parameters appear to depend mostly on the state of the surface zirconia cations stabilizing the radical anions, so that the g tensor anisotropy is significantly smaller over sulfated zirconia. It is shown that light-induced formation of superoxide radical anions in the presence of coadsorbed hydrocarbons can be initiated with visible light. Original SIET reaction mechanisms are suggested for the formation of superoxide radical anions by coadsorption with hydrocarbons and illumination after such coadsorption to extend the previously known ones to account for the observed phenomena. Cluster model DFT calculations of magnetic resonance parameters of O2- radical anions stabilized on the surface of zirconium dioxide showed that the adsorption complexes have a -shape rather than linear structure. The magnetic resonance parameters obtained by calculations practically match experimental data and adequately describe their changes after the surface modification with sulfates.
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Affiliation(s)
- David S. Heroux
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Alexander M. Volodin
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Vladimir I. Zaikovski
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Vladimir V. Chesnokov
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Alexander F. Bedilo
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Kenneth J. Klabunde
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
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Bolshov VA, Volodin AM, Zhidomirov GM, Shubin AA, Bedilo AF. Radical Intermediates in the Photoinduced Formation of Benzene Cation-Radicals over H-ZSM-5 Zeolites. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100082a027] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Volodin AM, Bolshov VA, Panov GI. The Role of Surface .alpha.-Oxygen in Formation of Cation Radicals at Benzene Adsorption on ZSM-5 Zeolite. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100082a026] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Fenelonov VB, Mel'gunov MS, Mishakov IV, Richards RM, Chesnokov VV, Volodin AM, Klabunde KJ. Changes in Texture and Catalytic Activity of Nanocrystalline MgO during Its Transformation to MgCl2 in the Reaction with 1-Chlorobutane. J Phys Chem B 2001. [DOI: 10.1021/jp0039969] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vladimir B. Fenelonov
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Maxim S. Mel'gunov
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Ilya V. Mishakov
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Ryan M. Richards
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Vladimir V. Chesnokov
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Alexander M. Volodin
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - Kenneth J. Klabunde
- Boreskov Institute of Catalysis, Novosibirsk 630090, Russia, and Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
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Konovalova TA, Bedilo AF, Volodin AM. Electron Donor-Acceptor Complexes – Key Intermediates in the Thermal and Photoinduced Reduction of Aromatic Nitro Compound in Donor Solvents. Mendeleev Communications 1995. [DOI: 10.1070/mc1995v005n04abeh000497] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Bolshov VA, Toktarev AV, Volodin AM. Ion-radical Mechanism of Low-temperature Benzene Polycondensation on ZSM-5 Zeolites. Mendeleev Communications 1994. [DOI: 10.1070/mc1994v004n06abeh000418] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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