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Cr-Zn/Ni-Containing Nanocomposites as Effective Magnetically Recoverable Catalysts for CO2 Hydrogenation to Methanol: The Role of Metal Doping and Polymer Co-Support. Catalysts 2022. [DOI: 10.3390/catal13010001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
CO2 hydrogenation to methanol is an important process that could solve the problem of emitted CO2 that contributes to environmental concern. Here we developed Cr-, Cr-Zn-, and Cr-Ni-containing nanocomposites based on a solid support (SiO2 or Al2O3) with embedded magnetic nanoparticles (NPs) and covered by a cross-linked pyridylphenylene polymer layer. The decomposition of Cr, Zn, and Ni precursors in the presence of supports containing magnetic oxide led to formation of amorphous metal oxides evenly distributed over the support-polymer space, together with the partial diffusion of metal species into magnetic NPs. We demonstrated the catalytic activity of Cr2O3 in the hydrogenation reaction of CO2 to methanol, which was further increased by 50% and 204% by incorporation of Ni and Zn species, respectively. The fine intermixing of metal species ensures an enhanced methanol productivity. Careful adjustment of constituent elements, e.g., catalytic metal, type of support, presence of magnetic NPs, and deposition of hydrophobic polymer layer contributes to the synergetic promotional effect required for activation of CO2 molecules as well. The results of catalytic recycle experiments revealed excellent stability of the catalysts due to protective role of hydrophobic polymer.
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2
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Karakhanov E, Maximov A, Zolotukhina A. Heterogeneous Dendrimer-Based Catalysts. Polymers (Basel) 2022; 14:polym14050981. [PMID: 35267800 PMCID: PMC8912888 DOI: 10.3390/polym14050981] [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: 01/28/2022] [Revised: 02/22/2022] [Accepted: 02/23/2022] [Indexed: 02/04/2023] Open
Abstract
The present review compiles the advances in the dendritic catalysis within the last two decades, in particular concerning heterogeneous dendrimer-based catalysts and their and application in various processes, such as hydrogenation, oxidation, cross-coupling reactions, etc. There are considered three main approaches to the synthesis of immobilized heterogeneous dendrimer-based catalysts: (1) impregnation/adsorption on silica or carbon carriers; (2) dendrimer covalent grafting to various supports (silica, polystyrene, carbon nanotubes, porous aromatic frameworks, etc.), which may be performed in a divergent (as a gradual dendron growth on the support) or convergent way (as a grafting of whole dendrimer to the support); and (3) dendrimer cross-linking, using transition metal ions (resulting in coordination polymer networks) or bifunctional organic linkers, whose size, polarity, and rigidity define the properties of the resulted material. Additionally, magnetically separable dendritic catalysts, which can be synthesized using the three above-mentioned approaches, are also considered. Dendritic catalysts, synthesized in such ways, can be stored as powders and be easily separated from the reaction medium by filtration/centrifugation as traditional heterogeneous catalysts, maintaining efficiency as for homogeneous dendritic catalysts.
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Affiliation(s)
- Eduard Karakhanov
- Department of Petroleum Chemistry and Organic Catalysis, Moscow State University, 119991 Moscow, Russia;
| | - Anton Maximov
- Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia;
| | - Anna Zolotukhina
- Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia;
- Correspondence:
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3
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Kuchkina NV, Sorokina SA, Bykov AV, Sulman MG, Bronstein LM, Shifrina ZB. Magnetically Recoverable Nanoparticulate Catalysts for Cross-Coupling Reactions: The Dendritic Support Influences the Catalytic Performance. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:3345. [PMID: 34947694 PMCID: PMC8708486 DOI: 10.3390/nano11123345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 12/05/2021] [Accepted: 12/06/2021] [Indexed: 11/16/2022]
Abstract
Carbon-carbon cross-coupling reactions are among the most important synthetic tools for the preparation of pharmaceuticals and bioactive compounds. However, these reactions are normally carried out using copper, phosphines, and/or amines, which are poisonous for pharmaceuticals. The use of nanocomposite catalysts holds promise for facilitating these reactions and making them more environmentally friendly. In the present work, the PEGylated (PEG stands for poly(ethylene glycol) pyridylphenylene dendrons immobilized on silica loaded with magnetic nanoparticles have been successfully employed for the stabilization of Pd2+ complexes and Pd nanoparticles. The catalyst developed showed excellent catalytic activity in copper-free Sonogashira and Heck cross-coupling reactions. The reactions proceeded smoothly in green solvents at low palladium loading, resulting in high yields of cross-coupling products (from 80% to 97%) within short reaction times. The presence of magnetic nanoparticles allows easy magnetic separation for repeated use without a noticeable decrease of catalytic activity due to the strong stabilization of Pd species by rigid and bulky dendritic ligands. The PEG dendron periphery makes the catalyst hydrophilic and better suited for green solvents. The minor drop in activity upon the catalyst reuse is explained by the formation of Pd nanoparticles from the Pd2+ species during the catalytic reaction. The magnetic separation and reuse of the nanocomposite catalyst reduces the cost of target products as well as energy and material consumption and diminishes residual contamination by the catalyst. These factors as well as the absence of copper in the catalyst makeup pave the way for future applications of such catalysts in cross-coupling reactions.
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Affiliation(s)
- Nina V. Kuchkina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., 119991 Moscow, Russia; (N.V.K.); (S.A.S.)
| | - Svetlana A. Sorokina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., 119991 Moscow, Russia; (N.V.K.); (S.A.S.)
| | - Alexey V. Bykov
- Department of Biotechnology and Chemistry, Tver State Technical University, 22 A. Nikitina St., 170026 Tver, Russia; (A.V.B.); (M.G.S.)
| | - Mikhail G. Sulman
- Department of Biotechnology and Chemistry, Tver State Technical University, 22 A. Nikitina St., 170026 Tver, Russia; (A.V.B.); (M.G.S.)
| | - Lyudmila M. Bronstein
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., 119991 Moscow, Russia; (N.V.K.); (S.A.S.)
- Department of Chemistry, Indiana University, 800 E. Kirkwood Av., Bloomington, IN 47405, USA
- Department of Physics, Faculty of Science, King Abdulaziz University, P.O. Box 80303, Jeddah 21589, Saudi Arabia
| | - Zinaida B. Shifrina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., 119991 Moscow, Russia; (N.V.K.); (S.A.S.)
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4
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Dickstein TA, Zhou E, Hershberger KK, Haskell AK, Morgan DG, Pink M, Stein BD, Nikoshvili LZ, Matveeva VG, Bronstein LM. Chitosan as capping agent in a robust one-pot procedure for a magnetic catalyst synthesis. Carbohydr Polym 2021; 269:118267. [PMID: 34294299 DOI: 10.1016/j.carbpol.2021.118267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 04/07/2021] [Accepted: 05/25/2021] [Indexed: 11/17/2022]
Abstract
Here, we report a one-pot solvothermal method for the development of magnetically recoverable catalysts with Ru or Ag nanoparticles (NPs) capped by chitosan (CS), a derivative of natural chitin. The formation of iron oxide NPs was carried out in situ in the presence of CS and iron acetylacetonate in boiling triethyleneglycol (TEG) due to CS solubilization in warm TEG. Coordination with Ru or Ag species and the NP formation take place in the same reaction solution, eliminating intermediate steps. In optimal conditions the method developed allows stabilization of 2.2 nm monodisperse Ru NPs (containing both Ru0 and Ru4+ species) that are evenly distributed through the catalyst, while for Ag NPs, this stabilizing medium is inferior, leading to exceptionally large Ag nanocrystals. Catalytic testing of CS-Ru magnetically recoverable catalysts in the reduction of 4-nitrophenol to 4-aminophenol with excess NaBH4 revealed that the catalyst with 2.2 nm Ru NPs exhibits the highest catalytic activity compared to samples with larger Ru NPs (2.9-3.2 nm). Moreover, this catalyst displayed extraordinary shelf-life in the aqueous solution (up to ten months) and excellent reusability in ten consecutive reactions with easy magnetic separation at each step which were assigned to its conformational rigidity at a constant pH. These characteristics as well as favorable environmental factors of the catalyst fabrication, make it promising for nitroarene reduction.
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Affiliation(s)
- Tomer A Dickstein
- Indiana University, Department of Chemistry, 800 E. Kirkwood Av., Bloomington, IN 47408, USA
| | - Ergang Zhou
- Indiana University, Department of Chemistry, 800 E. Kirkwood Av., Bloomington, IN 47408, USA
| | - Kian K Hershberger
- Indiana University, Department of Chemistry, 800 E. Kirkwood Av., Bloomington, IN 47408, USA
| | - Angela K Haskell
- Indiana University, Department of Chemistry, 800 E. Kirkwood Av., Bloomington, IN 47408, USA
| | - David Gene Morgan
- Indiana University, Department of Chemistry, 800 E. Kirkwood Av., Bloomington, IN 47408, USA
| | - Maren Pink
- Indiana University, Department of Chemistry, 800 E. Kirkwood Av., Bloomington, IN 47408, USA
| | - Barry D Stein
- Indiana University, Department of Biology, 1001 E. Third St., Bloomington, IN 47405, USA
| | - Linda Zh Nikoshvili
- Tver State Technical University, Department of Biotechnology, Chemistry, and Standardization, A.Nikitin str., 22, 170026 Tver, Russian Federation
| | - Valentina G Matveeva
- Tver State Technical University, Department of Biotechnology, Chemistry, and Standardization, A.Nikitin str., 22, 170026 Tver, Russian Federation; Tver State University, Regional Technological Centre, Zhelyabova str., 33, 170100 Tver, Russian Federation
| | - Lyudmila M Bronstein
- Indiana University, Department of Chemistry, 800 E. Kirkwood Av., Bloomington, IN 47408, USA; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., Moscow 119991, Russian Federation; King Abdulaziz University, Faculty of Science, Department of Physics, Jeddah 21589, Saudi Arabia.
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5
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Dendritic effect for immobilized pyridylphenylene dendrons in hosting catalytic Pd species: Positive or negative? REACT FUNCT POLYM 2020. [DOI: 10.1016/j.reactfunctpolym.2020.104582] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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6
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Kuchkina NV, Haskell AK, Sorokina SA, Torozova AS, Nikoshvili LZ, Sulman EM, Stein BD, Morgan DG, Bronstein LM, Shifrina ZB. Pd Catalyst Based on Hyperbranched Polypyridylphenylene Formed In Situ on Magnetic Silica Allows for Excellent Performance in Suzuki-Miyaura Reaction. ACS APPLIED MATERIALS & INTERFACES 2020; 12:22170-22178. [PMID: 32320210 DOI: 10.1021/acsami.0c04357] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Here, for the first time, we developed a catalytic composite by forming a thin layer of a cross-linked hyperbranched pyridylphenylene polymer (PPP) on the surface of mesoporous magnetic silica (Fe3O4-SiO2, MS) followed by complexation with Pd species. The interaction of Pd acetate (PdAc) with pyridine units of the polymer results in the formation of Pd2+ complexes which are evenly distributed through the PPP layer. The MS-PPP-PdAc catalyst was tested in the Suzuki-Miyaura cross-coupling reaction with four different para-Br-substituted arenes, demonstrating enhanced catalytic properties for substrates containing electron withdrawing groups, and especially, for 4-bromobenzaldehyde. In this case, 100% selectivity and conversion were achieved with TOF of >23 000 h-1 at a very low Pd loading (0.032 mol %), a remarkable performance in this reaction. We believe these exceptional catalytic properties are due to the hyperbranched polymer architecture, which allows excellent stabilization of catalytic species as well as a favorable space for reacting molecules. Additionally, the magnetic character of the support allows for easy magnetic separation during the catalyst synthesis, purification, and reuse, resulting in energy and materials savings. These factors and excellent reusability of MS-PPP-PdAc in five consecutive uses make this catalyst promising for a variety of catalytic reactions.
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Affiliation(s)
- Nina V Kuchkina
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, Moscow 119991, Russia
| | - Angela K Haskell
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Svetlana A Sorokina
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, Moscow 119991, Russia
| | - Alexandra S Torozova
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, Moscow 119991, Russia
| | - Linda Zh Nikoshvili
- Department of Biotechnology and Chemistry, Tver State Technical University, 22 A. Nikitina Street, 170026 Tver, Russia
| | - Esther M Sulman
- Department of Biotechnology and Chemistry, Tver State Technical University, 22 A. Nikitina Street, 170026 Tver, Russia
| | - Barry D Stein
- Department of Biology, Indiana University, 1001 East Third Street, Bloomington, Indiana 47405, United States
| | - David Gene Morgan
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Lyudmila M Bronstein
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, Moscow 119991, Russia
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
- Faculty of Science, Department of Physics, King Abdulaziz University, P.O. Box 80303, Jeddah 21589, Saudi Arabia
| | - Zinaida B Shifrina
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, Moscow 119991, Russia
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7
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Zheng H, Narkhede N, Zhang H, Li Z. Oriented Isomorphous Substitution: An Efficient and Alternative Route to Fabricate the Zn Rich Phase Pure (Cu
1−
x
,Zn
x
)
2
(OH)
2
CO
3
Precursor Catalyst for Methanol Synthesis. ChemCatChem 2020. [DOI: 10.1002/cctc.201902286] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Huayan Zheng
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province Institute of Coal Chemical EngineeringTaiyuan University of Technology Taiyuan 030024, Shanxi P. R. China
| | - Nilesh Narkhede
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province Institute of Coal Chemical EngineeringTaiyuan University of Technology Taiyuan 030024, Shanxi P. R. China
| | - Huacheng Zhang
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province Institute of Coal Chemical EngineeringTaiyuan University of Technology Taiyuan 030024, Shanxi P. R. China
| | - Zhong Li
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province Institute of Coal Chemical EngineeringTaiyuan University of Technology Taiyuan 030024, Shanxi P. R. China
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8
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Jiao W, Chen C, You W, Zhang J, Liu J, Che R. Yolk-Shell Fe/Fe 4 N@Pd/C Magnetic Nanocomposite as an Efficient Recyclable ORR Electrocatalyst and SERS Substrate. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1805032. [PMID: 30650258 DOI: 10.1002/smll.201805032] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 12/27/2018] [Indexed: 06/09/2023]
Abstract
A yolk-shell Fe/Fe4 N@Pd/C (FFPC) nanocomposite is synthesized successfully by two facile steps: interfacial polymerization and annealing treatment. The concentration of Pd2+ is the key factor for the density of Pd nanoparticles (Pd NPs) embedded in the carbon shells, which plays a role in the oxygen reduction reaction (ORR) and surface-enhanced Raman scattering (SERS) properties. The ORR and SERS performances of FFPC nanocomposites under different concentrations of PdCl2 are investigated. The optimal ORR performance exhibits that onset potential and tafel slope can reach 0.937 V (vs reversible hydrogen electrode (RHE)) and 74 mV dec-1 , respectively, which is attributed to the synergistic effects of good electrical conductivity, large electrochemically active areas, and strong interfacial charge polarization. Off-axis electron holography reveals that interfacial charge polarization could facilitate the ORR of Pd NPs and defective carbon simultaneously and the shell with low density of Pd NPs is easier to form strong interfacial charge polarization. Moreover, FFPC-3 with maximum EF of 2.3 × 105 results from more hot-spots, local positive charge centers to attract rhodamine 6G molecules, and magnetic cores. This work not only offers a recyclable multifunctional nanocomposite with excellent performance, but also has instructional implications for interfacial engineering for electrocatalysts design.
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Affiliation(s)
- Wenling Jiao
- Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, China
| | - Chen Chen
- Department of Macromolecular Science, Fudan University, Shanghai, 200438, China
| | - Wenbin You
- Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, China
| | - Jie Zhang
- Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, China
| | - Jiwei Liu
- Department of Materials Science and Engineering, Changzhou University, Jiangsu, 213164, China
| | - Renchao Che
- Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, China
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9
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Gregor L, Reilly AK, Dickstein TA, Mazhar S, Bram S, Morgan DG, Losovyj Y, Pink M, Stein BD, Matveeva VG, Bronstein LM. Facile Synthesis of Magnetically Recoverable Pd and Ru Catalysts for 4-Nitrophenol Reduction: Identifying Key Factors. ACS OMEGA 2018; 3:14717-14725. [PMID: 31458148 PMCID: PMC6643374 DOI: 10.1021/acsomega.8b02382] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 10/25/2018] [Indexed: 05/08/2023]
Abstract
This paper reports the development of robust Pd- and Ru-containing magnetically recoverable catalysts in a one-pot procedure using commercially available, branched polyethyleneimine (PEI) as capping and reducing agent. For both catalytic metals, ∼3 nm nanoparticles (NPs) are stabilized in the PEI shell of magnetite NPs, whose aggregation allows for prompt magnetic separation. The catalyst properties were studied in a model reaction of 4-nitrophenol hydrogenation to 4-aminophenol with NaBH4. A similar catalytic NP size allowed us to decouple the NP size impact on the catalytic performance from other parameters and to follow the influence of the catalytic metal type and amount as well as the PEI amount on the catalytic activity. The best catalytic performances, the 1.2 min-1 rate constant and the 433.2 min-1 turnover frequency, are obtained for the Ru-containing catalyst. This is discussed in terms of stability of Ru hydride facilitating the surface-hydrogen transfer and the presence of Ru4+ species on the Ru NP surface facilitating the nitro group adsorption, both leading to an increased catalyst efficiency. High catalytic activity as well as the high stability of the catalyst performance in five consecutive catalytic cycles after magnetic separation makes this catalyst promising for nitroarene hydrogenation reactions.
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Affiliation(s)
- Lennon Gregor
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Austin K. Reilly
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Tomer A. Dickstein
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Sumaira Mazhar
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Stanley Bram
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - David Gene Morgan
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Yaroslav Losovyj
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Maren Pink
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Barry D. Stein
- Department
of Biology, Indiana University, 1001 E. Third Street, Bloomington, Indiana 47405, United States
| | - Valentina G. Matveeva
- Regional
Technological Center, Tver State University, Zhelyabova Street, 33, Tver 170100, Russia
| | - Lyudmila M. Bronstein
- Department
of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, Moscow 119991 Russia
- Faculty
of Science, Department of Physics, King
Abdulaziz University, P.O. Box 80303, Jeddah 21589, Saudi Arabia
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10
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Liu X, Liu X, Wang X. Splitting of Hydrogen Sulfide by Group 14 Elements (Si, Ge, Sn, Pb) in Excess Argon at Cryogenic Temperatures. J Phys Chem A 2018; 122:7023-7032. [DOI: 10.1021/acs.jpca.8b04428] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xing Liu
- College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Xiaorui Liu
- College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Xuefeng Wang
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China
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11
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Shifrina ZB, Bronstein LM. Magnetically Recoverable Catalysts: Beyond Magnetic Separation. Front Chem 2018; 6:298. [PMID: 30073164 PMCID: PMC6058181 DOI: 10.3389/fchem.2018.00298] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 06/29/2018] [Indexed: 11/13/2022] Open
Abstract
Here, we discuss several important aspects of magnetically recoverable catalysts which can be realized when magnetic oxide nanoparticles are exposed to catalytic species and catalytic reaction media. In such conditions magnetic oxides can enhance performance of catalytic nanoparticles due to (i) electronic effects, (ii) catalyzing reactions which are beneficial for the final reaction outcome, or (iii) providing a capacity to dilute catalytic metal oxide species, leading to an increase of oxygen vacancies. However, this approach should be used when the magnetic oxides are stable in reaction conditions and do not promote side reactions. Incorporation of another active component, i.e., a graphene derivative, in the magnetically recoverable catalyst constitutes a smart design of a catalytic system due to synergy of its components, further enhancing catalytic properties.
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Affiliation(s)
- Zinaida B Shifrina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia
| | - Lyudmila M Bronstein
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia.,Department of Chemistry, Indiana University, Bloomington, IN, United States.,Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
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12
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Das VK, Mazhar S, Gregor L, Stein BD, Morgan DG, Maciulis NA, Pink M, Losovyj Y, Bronstein LM. Graphene Derivative in Magnetically Recoverable Catalyst Determines Catalytic Properties in Transfer Hydrogenation of Nitroarenes to Anilines with 2-Propanol. ACS APPLIED MATERIALS & INTERFACES 2018; 10:21356-21364. [PMID: 29870226 DOI: 10.1021/acsami.8b06378] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Here, we report transfer hydrogenation of nitroarenes to aminoarenes using 2-propanol as a hydrogen source and Ag-containing magnetically recoverable catalysts based on partially reduced graphene oxide (pRGO) sheets. X-ray diffraction and X-ray photoelectron spectroscopy data demonstrated that, during the one-pot catalyst synthesis, formation of magnetite nanoparticles (NPs) is accompanied by the reduction of graphene oxide (GO) to pRGO. The formation of Ag0 NPs on top of magnetite nanoparticles does not change the pRGO structure. At the same time, the catalyst structure is further modified during the transfer hydrogenation, leading to a noticeable increase of sp2 carbons. These carbons are responsible for the adsorption of substrate and intermediates, facilitating a hydrogen transfer from Ag NPs and creating synergy between the components of the catalyst. The nitroarenes with electron withdrawing and electron donating substituents allow for excellent yields of aniline derivatives with high regio and chemoselectivity, indicating that the reaction is not disfavored by these functionalities. The versatility of the catalyst synthetic protocol was demonstrated by a synthesis of an Ru-containing graphene derivative based catalyst, also allowing for efficient transfer hydrogenation. Easy magnetic separation and stable catalyst performance in the transfer hydrogenation make this catalyst promising for future applications.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Lyudmila M Bronstein
- A.N. Nesmeyanov Institute of Organoelement Compounds , Russian Academy of Sciences , 28 Vavilov St. , Moscow 119991 , Russia
- Faculty of Science, Department of Physics , King Abdulaziz University , Jeddah 21589 , Saudi Arabia
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