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Vedyagin AA, Stoyanovskii VO, Kenzhin RM, Plyusnin PE, Shubin YV. Iridium-Containing Automotive Emission Control Catalysts. DOKLADY PHYSICAL CHEMISTRY 2022. [DOI: 10.1134/s0012501622600218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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2
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Shuvarakova EI, Bedilo AF, Kenzhin RM, Ilyina EV, Gerus YY. Synthesis and Investigation of Finely Dispersed Calcium Aluminates and Catalysts Based on Them. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2022. [DOI: 10.1134/s199079312203023x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Akil J, Ciotonea C, Siffert S, Royer S, Pirault-Roy L, Cousin R, Poupin C. NO reduction by CO under oxidative conditions over CoCuAl mixed oxides derived from hydrotalcite-like compounds: Effect of water. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.05.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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4
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Mahato S, Mondal A, Das M, Joshi M, Ray PP, Roy Choudhury A, Reddy CM, Biswas B. De novo synthesis of hybrid d-f block metal complex salts for electronic charge transport applications. Dalton Trans 2022; 51:1561-1570. [PMID: 34989731 DOI: 10.1039/d1dt02722k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The advent of d-d type complex salts for designing smart functional materials with versatile utility inspired us to develop a novel type of M(II)-Ce(IV) complex salts [M(II) = Cu and Zn ions]. In this study, we present for the first time a holistic approach to design and prepare metal complex salts of the novel hybrid d-f block type, [Cu(bpy)2]2[Ce(NO3)6]2 (1), [Cu(phen)2(NO3)]2[Ce(NO3)6](HNO3) (2), [Zn(bpy)2(NO3)][ClO4] (3), and [Zn(phen)2(NO3)]2 [Ce(NO3)6] (4); [bpy = 2,2'-bipyridine; phen = 1,10-phenanthroline]. The intrinsic structural and morphological properties of the compounds have been revealed by employing a suite of analytical and spectroscopic methods. X-ray structural analysis reveals that the copper(II) centres in the cationic complex units of 1 and 2 adopt a highly distorted tetrahedral and a rare bicapped square pyramidal coordination geometry, respectively. The zinc(II) ions in both 3 and 4 adopt the rare bicapped square pyramidal geometry while the cerium(IV) ions in 1, 2 and 4 exist in a dodecahedral geometry. Investigation of supramolecular interactions reveals that intermolecular O⋯H and O⋯π short contacts bind the complex units in 1, while predominant π⋯π interactions, along with O⋯H and O⋯π short contacts, produce the binding force among the complex units in 2. We further employed the complex salts (1-4) to construct Schottky devices to reveal the role of these new complex salts in the charge-transport phenomenon. The carrier mobilities (μ) for salts 1-4 were determined to be 1.76 × 10-6, 9.02 × 10-6, 1.86 × 10-8, and 4.31 × 10-8 m2 V-1 s-1, with respective transit times (τ) of 439, 85, 4.17 × 103, and 1.79 × 103 ns, which suggest that complex salt 2 is the best candidate with the highest transport properties among all the complex salts. A crystal engineering perspective sheds light on the charge-transport properties of the complex salts, emphasizing the attribution of the best performance of 2 to its predominant π⋯π interactions. The synthesis of this new type of complex salts, their physicochemical properties and their charge-transport applications envisage great promise for the development of novel crystalline materials with smart functionalities.
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Affiliation(s)
- Shreya Mahato
- Department of Chemistry, University of North Bengal, Darjeeling 734013, India.
| | - Amit Mondal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Nadia 741246, India
| | - Mainak Das
- Department of Physics, Jadavpur University, Kolkata 700032, India
| | - Mayank Joshi
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli PO, Mohali, Punjab 140306, India
| | | | - Angshuman Roy Choudhury
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli PO, Mohali, Punjab 140306, India
| | - C Malla Reddy
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Nadia 741246, India
| | - Bhaskar Biswas
- Department of Chemistry, University of North Bengal, Darjeeling 734013, India.
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Gladysheva MV, Plyusnin PE, Vorobyeva SN, Komarov VY, Tkachev SV, Shubin YV, Korenev SV. COMPLEX SALT [Pd(NH3)4][Pd(NH3)3NO2][RhOx3]·H2O AS A PROSPECTIVE PRECURSOR OF Pd–Rh NANOALLOYS. CRYSTAL STRUCTURE OF Na3[RhOx3]·4H2O. J STRUCT CHEM+ 2021. [DOI: 10.1134/s0022476621050140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Hubkowska K, Kubisztal J, Pająk M, Łosiewicz B, Czerwiński A. Effect of the Alloying Metal on the Corrosion Resistance of Pd-Rich Binary Alloys with Pt, Rh, and Ru in Sulfuric Acid. MATERIALS (BASEL, SWITZERLAND) 2021; 14:2923. [PMID: 34071575 PMCID: PMC8198221 DOI: 10.3390/ma14112923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/17/2021] [Accepted: 05/25/2021] [Indexed: 11/17/2022]
Abstract
The paper presents the study of the corrosion resistance of electrodeposited Pd and its binary alloys with Pt, Rh, and Ru on a polycrystalline Au substrate. The corrosion resistance was tested in 0.5 M sulfuric acid at room temperature using potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The morphology/composition and work function values were determined by scanning electron microscopy/energy-dispersive X-ray spectroscopy and scanning Kelvin probe, respectively. The obtained results revealed that the Pd electrode is the most resistant to corrosion, whereas the Pd-Ru electrode is the most susceptible to dissolution. It was found that the corrosion resistance of Pd-binary alloys decrease in the following order: Pd > Pd-Pt > Pd-Rh > Pd-Ru. This effect was assigned mainly to the difference in surface roughness factor of tested electrodes.
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Affiliation(s)
- Katarzyna Hubkowska
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.P.); (A.C.)
| | - Julian Kubisztal
- Institute of Materials Engineering, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland; (J.K.); (B.Ł.)
| | - Małgorzata Pająk
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.P.); (A.C.)
| | - Bożena Łosiewicz
- Institute of Materials Engineering, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland; (J.K.); (B.Ł.)
| | - Andrzej Czerwiński
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.P.); (A.C.)
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7
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Characterization of the Evolution of Noble Metal Particles in a Commercial Three-Way Catalyst: Correlation between Real and Simulated Ageing. Catalysts 2021. [DOI: 10.3390/catal11020247] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Ageing of automotive catalysts is associated to a loss of their functionality and ultimately to a waste of precious resources. For this reason, understanding catalyst ageing phenomena is necessary for the design of long lasting efficient catalysts. The present work has the purpose of studying in depth all the phenomena that occur during ageing, in terms of morphological modification and deactivation of the active materials: precious metal particles and oxidic support. The topic was deeply investigated using specific methodologies (FT-IR, CO chemisorption, FE-SEM) in order to understand the behavior of metals and support, in terms of their surface properties, morphology and dispersion in the washcoat material. A series of commercial catalysts, aged in different conditions, have been analyzed, in order to find correlations between real and simulated ageing conditions. The characterization highlights a series of phenomena linked to the deactivation of the catalysts. Pd nanoparticles undergo a rapid agglomeration, exhibiting a quick loss of dispersion and of active sites with an increase of particles size. The evolution of the support allows highlighting also the contribution of chemical ageing effects. These results were also correlated with performance tests executed on synthetic gas bench, underlining a good correspondence between vehicle and laboratory aged samples and the contribution of chemical poisoning to vehicle aged ones. The collected data are crucial for the development of accelerated laboratory ageing protocols, which are instrumental for the development and testing of long lasting abatement systems.
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Maksimov GM, Gerasimov EY, Kenzhin RM, Saraev AA, Kaichev VV, Vedyagin AA. CO oxidation over titania-supported gold catalysts obtained using polyoxometalate. REACTION KINETICS MECHANISMS AND CATALYSIS 2021. [DOI: 10.1007/s11144-020-01881-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Abstract
Ternary alloys of platinum group metals attract a growing interest due to their unique catalytic properties. The present research is aimed to synthesize a series of Rh-Pd-Pt alloys with varied ratios of metals using a single-source precursor approach. Rhodium and palladium are partly miscible metals, while each of these metals is unlimitedly miscible with platinum. Thermolysis of complex salts used as a precursor results in the formation of metastable systems. The 3D nanostructure alloys are being formed after the complete decomposition of the single-source precursor. High-resolution transmission electron microscopic studies have shown that the nanoalloys are composed of interconnected polycrystalline ligaments with a mean diameter of 50 nm. The single-phase composition is confirmed by an X-ray diffraction analysis. The ratio of metals plays an important role in determining the catalytic activity of alumina-supported alloys and their thermal stability. According to UV-vis spectroscopy data, the higher palladium portion corresponds to worse dispersion of initially prepared, fresh catalysts. Treatment of the catalysts under prompt thermal aging conditions (up to 800 °C) causes redispersion of palladium-rich alloyed nanoparticles, thus leading to improved catalytic activity and thermal stability.
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Vasilchenko D, Topchiyan P, Baidina I, Korolkov I, Filatov E, Zvereva V, Plyusnin P, Slavinskaya E, Gerasimov E. Double complex salts containing [Pt(NO3)6]2- anion and Rh(III) complex cations: Synthesis, structure and utilisation for preparing (Rh–Pt)/CeO2 catalysts. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Yurpalov VL, Stepanova LN, Drozdov VA, Belskaya OB. The application of 1,3,5-trinitrobenzene as a spin probe for the surface basic sites study of MgAl double oxides by EPR spectroscopy. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124733] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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Vedyagin AA, Alikin EA, Kenzhin RM, Tashlanov MY, Stoyanovskii VO, Plyusnin PE, Shubin YV, Mishakov IV. Interaction of Pd and Rh with ZrCeYLaO2 support during thermal aging and its effect on the CO oxidation activity. REACTION KINETICS MECHANISMS AND CATALYSIS 2020. [DOI: 10.1007/s11144-019-01704-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Effect of La Addition on the Performance of Three-Way Catalysts Containing Palladium and Rhodium. Top Catal 2020. [DOI: 10.1007/s11244-019-01213-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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14
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Velin P, Florén CR, Skoglundh M, Raj A, Thompsett D, Smedler G, Carlsson PA. Palladium dispersion effects on wet methane oxidation kinetics. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00734j] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The catalytic activity for dry and wet methane oxidation over a series of palladium–alumina catalysts with systematically varied palladium loadings and PdO dispersions was measured and compared with conceptual multiscale simulations.
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Affiliation(s)
- Peter Velin
- Department of Chemistry and Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
| | - Carl-Robert Florén
- Department of Chemistry and Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
| | - Magnus Skoglundh
- Department of Chemistry and Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
| | - Agnes Raj
- Johnson Matthey Technology Centre
- Reading
- UK
| | | | | | - Per-Anders Carlsson
- Department of Chemistry and Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
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15
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Purification of gasoline exhaust gases using bimetallic Pd–Rh/δ-Al2O3 catalysts. REACTION KINETICS MECHANISMS AND CATALYSIS 2019. [DOI: 10.1007/s11144-019-01573-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Kostin G, Plyusnin P, Filatov EY, Kuratieva N, Vedyagin A, Kal'nyi D. Double complex salts [PdL4][RuNO(NO2)4OH] (L = NH3, Py) synthesis, structure and preparation of bimetallic metastable solid solution Pd0.5Ru0.5. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.11.065] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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17
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Optical Spectroscopy Methods in the Estimation of the Thermal Stability of Bimetallic Pd–Rh/Al2O3 Three-Way Catalysts. Top Catal 2018. [DOI: 10.1007/s11244-018-1112-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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19
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Potemkin DI, Konishcheva MV, Zadesenets AV, Snytnikov PV, Filatov EY, Korenev SV, Sobyanin VA. Bimetallic Pt0.5Co0.5/SiO2 Catalyst: Preparation, Structure, and Properties in Preferential Oxidation of Carbon Monoxide. KINETICS AND CATALYSIS 2018. [DOI: 10.1134/s0023158418040110] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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20
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Potemkin DI, Maslov DK, Loponov K, Snytnikov PV, Shubin YV, Plyusnin PE, Svintsitskiy DA, Sobyanin VA, Lapkin AA. Porous Nanocrystalline Silicon Supported Bimetallic Pd-Au Catalysts: Preparation, Characterization, and Direct Hydrogen Peroxide Synthesis. Front Chem 2018; 6:85. [PMID: 29637068 PMCID: PMC5880941 DOI: 10.3389/fchem.2018.00085] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 03/12/2018] [Indexed: 11/13/2022] Open
Abstract
Bimetallic Pd-Au catalysts were prepared on the porous nanocrystalline silicon (PSi) for the first time. The catalysts were tested in the reaction of direct hydrogen peroxide synthesis and characterized by standard structural and chemical techniques. It was shown that the Pd-Au/PSi catalyst prepared from conventional H2[PdCl4] and H[AuCl4] precursors contains monometallic Pd and a range of different Pd-Au alloy nanoparticles over the oxidized PSi surface. The PdAu2/PSi catalyst prepared from the [Pd(NH3)4][AuCl4]2 double complex salt (DCS) single-source precursor predominantly contains bimetallic Pd-Au alloy nanoparticles. For both catalysts the surface of bimetallic nanoparticles is Pd-enriched and contains palladium in Pd0 and Pd2+ states. Among the catalysts studied, the PdAu2/PSi catalyst was the most active and selective in the direct H2O2 synthesis with H2O2 productivity of 0.5 mol gPd-1 h-1 at selectivity of 50% and H2O2 concentration of 0.023 M in 0.03 M H2SO4-methanol solution after 5 h on stream at −10°C and atmospheric pressure. This performance is due to high activity in the H2O2 synthesis reaction and low activities in the undesirable H2O2 decomposition and hydrogenation reactions. Good performance of the PdAu2/PSi catalyst was associated with the major part of Pd in the catalyst being in the form of the bimetallic Pd-Au nanoparticles. Porous silicon was concluded to be a promising catalytic support for direct hydrogen peroxide synthesis due to its inertness with respect to undesirable side reactions, high thermal stability, and conductivity, possibility of safe operation at high temperatures and pressures and a well-established manufacturing process.
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Affiliation(s)
- Dmitriy I Potemkin
- Laboratory of the Energy-Efficient Catalytic Processes, Novosibirsk State University, Novosibirsk, Russia.,Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russia
| | - Dmitry K Maslov
- Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russia
| | - Konstantin Loponov
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom
| | - Pavel V Snytnikov
- Laboratory of the Energy-Efficient Catalytic Processes, Novosibirsk State University, Novosibirsk, Russia.,Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russia
| | - Yuri V Shubin
- Laboratory of the Energy-Efficient Catalytic Processes, Novosibirsk State University, Novosibirsk, Russia.,Laboratory of the Rare Platinum Metals Chemistry, Nikolaev Institute of Inorganic Chemistry, Novosibirsk, Russia
| | - Pavel E Plyusnin
- Laboratory of the Energy-Efficient Catalytic Processes, Novosibirsk State University, Novosibirsk, Russia.,Laboratory of the Rare Platinum Metals Chemistry, Nikolaev Institute of Inorganic Chemistry, Novosibirsk, Russia
| | - Dmitry A Svintsitskiy
- Laboratory of the Energy-Efficient Catalytic Processes, Novosibirsk State University, Novosibirsk, Russia.,Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russia
| | - Vladimir A Sobyanin
- Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russia
| | - Alexei A Lapkin
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom.,Cambridge Centre for Advanced Research and Education in Singapore Ltd., Singapore, Singapore
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22
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Potemkin DI, Saparbaev ES, Zadesenets AV, Filatov EY, Snytnikov PV, Sobyanin VA. Preferential CO Oxidation on Bimetallic Pt0.5M0.5 Catalysts (M = Fe, Co, Ni) Prepared from Double Complex Salts. CATALYSIS IN INDUSTRY 2018. [DOI: 10.1134/s2070050418010099] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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23
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Franco CHJ, Chagas P, Caldeira GS, Oliveira LCA, de Souza PP, Leitão AA, Amarante GW, Diniz R. Synthesis of glycerol carbonate over a 2D coordination polymer built with Nd 3+ions and organic ligands. Dalton Trans 2018; 47:10976-10988. [DOI: 10.1039/c8dt01803k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The production of glycerol carbonate from glycerol and urea using a 2D coordination polymer as the heterogeneous catalyst.
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Affiliation(s)
- Chris H. J. Franco
- Universidade Federal de Juiz de Fora
- Chemistry Department
- Juiz de Fora
- Brazil
| | - Poliane Chagas
- Universidade Federal de Minas Gerais
- Chemistry Department
- Belo Horizonte
- Brazil
| | - Gabriela S. Caldeira
- Centro Federal de Educação Tecnológica de Minas Gerais
- Chemistry Department
- Belo Horizonte
- Brazil
| | - Luiz C. A. Oliveira
- Universidade Federal de Minas Gerais
- Chemistry Department
- Belo Horizonte
- Brazil
| | - Patterson P. de Souza
- Centro Federal de Educação Tecnológica de Minas Gerais
- Chemistry Department
- Belo Horizonte
- Brazil
| | | | | | - Renata Diniz
- Universidade Federal de Juiz de Fora
- Chemistry Department
- Juiz de Fora
- Brazil
- Universidade Federal de Minas Gerais
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24
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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26
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Kirilovich AK, Plyusnin PE, Piryazev DA, Gromilov SA, Korenev SV. New double complex salt [PdEn2]3[Rh(NO2)6]2 · 2.67H2O: Synthesis, crystal structure, and thermal properties. RUSS J INORG CHEM+ 2017. [DOI: 10.1134/s0036023617070099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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27
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Gonçalves AAS, Faustino PB, Assaf JM, Jaroniec M. One-Pot Synthesis of Mesoporous Ni-Ti-Al Ternary Oxides: Highly Active and Selective Catalysts for Steam Reforming of Ethanol. ACS APPLIED MATERIALS & INTERFACES 2017; 9:6079-6092. [PMID: 28117577 DOI: 10.1021/acsami.6b15507] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
One-pot synthesis of nanostructured ternary oxides of Ni, Al, and Ti was designed and performed via evaporation induced self-assembly (EISA). For the purpose of comparison, analogous oxides were also prepared by the impregnation method. The resulting materials were applied in two catalytic reactions: steam reforming of ethanol (SRE) for H2 production (subjected to prior activation with H2) and ethanol dehydration (ED; used without prior activation), to in situ analyze carbon accumulation by ethylene depletion when ethanol interacts with acidic sites present on the support. Modification of Ni-Al mixed oxides with titania was shown to have several benefits. CO2, NH3, and propylamine sorption data indicate a decrease in the strength of acidic and basic sites after addition of titania, which in turn slowed down the carbon accumulation during the ED reaction. These changes in interactions between ethanol and byproducts with the support led to different reaction pathways in SRE, indicating that the catalysts obtained by EISA with titania addition showed higher ethylene selectivity and CO2/CO ratios. The opposite was observed for the impregnated catalysts, which were less coke-stable during ED reactions and showed no ethylene selectivity in SRE. Carbon formed during ED reactions was shown to be thermodynamically less favorable and easier to decompose in the presence of titania. All catalysts studied displayed similar and high selectivities (∼80%) and yields (∼5.3 molH2/molethanol) toward H2, which place them among the most active and selective catalysts for SRE. These results indicate the importance of tailoring the support surface acidity to achieve high reforming performance and higher selectivity toward SRE, one of the key processes to produce cleaner and efficient fuels. For an efficient reforming process, the yield of byproducts is low but still they affect the catalyst stability in the long-run, thus this work may impact future studies toward development of near-zero coke catalysts.
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Affiliation(s)
- Alexandre A S Gonçalves
- Department of Chemistry and Biochemistry, Kent State University , Kent, Ohio 44240, United States
| | - Patrícia B Faustino
- Department of Chemical Engineering, Federal University of Sao Carlos , Sao Carlos, Sao Paulo13565-905, Brazil
| | - José M Assaf
- Department of Chemical Engineering, Federal University of Sao Carlos , Sao Carlos, Sao Paulo13565-905, Brazil
| | - Mietek Jaroniec
- Department of Chemistry and Biochemistry, Kent State University , Kent, Ohio 44240, United States
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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] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Part I: A Comparative Thermal Aging Study on the Regenerability of Rh/Al2O3 and Rh/CexOy-ZrO2 as Model Catalysts for Automotive Three Way Catalysts. Catalysts 2015. [DOI: 10.3390/catal5041770] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Wilson A, Bernard R, Borensztein Y, Croset B, Cruguel H, Vlad A, Coati A, Garreau Y, Prévot G. Critical Au Concentration for the Stabilization of Au-Cu Nanoparticles on Rutile against Dissociation under Oxygen. J Phys Chem Lett 2015; 6:2050-2055. [PMID: 26266501 DOI: 10.1021/acs.jpclett.5b00791] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Controlling aging of catalysts is of crucial importance to preserve their properties, in particular for bimetallic nanoparticles (NPs) where reaction can modify the composition. Herein, we have studied the stability upon oxygen exposure of gold-copper NPs supported on rutile. We have used in situ scanning tunneling microscopy to follow the evolution of individual Au, Cu and Au-Cu NPs with various compositions grown on the TiO2(110) surface, during each step from their nucleation to their modification with oxygen. We demonstrated a direct relation between the stability of the nanoparticles and their Au concentration. Whereas pure Cu nanoparticles dissociate under O2, Au-Cu NPs containing at least 20% Au are stable. This is explained by a modification of the local density of states of Cu atoms upon alloying.
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Affiliation(s)
- A Wilson
- †Institut des NanoSciences de Paris, Université Paris 6, 4, place Jussieu, 75252 Paris CEDEX 05, France
- ‡Institut des NanoSciences de Paris, UMR CNRS 7588, 4, place Jussieu, 75252 Paris CEDEX 05, France
- §Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin - BP 48 91192 Gif-sur-Yvette CEDEX, France
| | - R Bernard
- †Institut des NanoSciences de Paris, Université Paris 6, 4, place Jussieu, 75252 Paris CEDEX 05, France
- ‡Institut des NanoSciences de Paris, UMR CNRS 7588, 4, place Jussieu, 75252 Paris CEDEX 05, France
| | - Y Borensztein
- †Institut des NanoSciences de Paris, Université Paris 6, 4, place Jussieu, 75252 Paris CEDEX 05, France
- ‡Institut des NanoSciences de Paris, UMR CNRS 7588, 4, place Jussieu, 75252 Paris CEDEX 05, France
| | - B Croset
- †Institut des NanoSciences de Paris, Université Paris 6, 4, place Jussieu, 75252 Paris CEDEX 05, France
- ‡Institut des NanoSciences de Paris, UMR CNRS 7588, 4, place Jussieu, 75252 Paris CEDEX 05, France
| | - H Cruguel
- †Institut des NanoSciences de Paris, Université Paris 6, 4, place Jussieu, 75252 Paris CEDEX 05, France
- ‡Institut des NanoSciences de Paris, UMR CNRS 7588, 4, place Jussieu, 75252 Paris CEDEX 05, France
| | - A Vlad
- §Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin - BP 48 91192 Gif-sur-Yvette CEDEX, France
| | - A Coati
- §Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin - BP 48 91192 Gif-sur-Yvette CEDEX, France
| | - Y Garreau
- ∥Université Paris Diderot, Sorbonne-Paris-Cité, MPQ, UMR 7162 CNRS, Bâtiment Condorcet, Case 7021, 75205 Paris CEDEX 13, France
| | - G Prévot
- †Institut des NanoSciences de Paris, Université Paris 6, 4, place Jussieu, 75252 Paris CEDEX 05, France
- ‡Institut des NanoSciences de Paris, UMR CNRS 7588, 4, place Jussieu, 75252 Paris CEDEX 05, France
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