A5042477798- Nanomaterials for catalytic reactions
- Catalysis for Biomass Conversion
- Catalysis and Hydrodesulfurization Studies
- Catalytic Cross-Coupling Reactions
- Covalent Organic Framework Applications
- Asymmetric Hydrogenation and Catalysis
- Catalytic Processes in Materials Science
- Supercapacitor Materials and Fabrication
- Dendrimers and Hyperbranched Polymers
- Metal-Organic Frameworks: Synthesis and Applications
- Mesoporous Materials and Catalysis
- Polyoxometalates: Synthesis and Applications
- Layered Double Hydroxides Synthesis and Applications
- Biofuel production and bioconversion
- Chemical Synthesis and Analysis
- Advanced Polymer Synthesis and Characterization
- Biodiesel Production and Applications
- Catalysts for Methane Reforming
- Membrane Separation and Gas Transport
- Innovative Microfluidic and Catalytic Techniques Innovation
- Catalysis and Oxidation Reactions
- Conducting polymers and applications
- Polymer Surface Interaction Studies
- Block Copolymer Self-Assembly
- Coordination Chemistry and Organometallics
Tver State Technical University
2015-2024
Tver State University
2007-2020
In recent years, composite materials including organic–inorganic systems have drawn special attention due to their enhanced properties such as adsorbents and heterogeneous catalysts. At the same time, large-scale production of environmentally benign functionalized biopolymers, chitosan (CS), allows for constantly developing new materials, since CS reveals remarkable a stabilizing agent metal-containing compounds enzymes an adsorbent organic molecules. This review is focused on CS-based...
Here we report the functionalization of monodisperse iron oxide nanoparticles (NPs) with commercially available functional acids containing multiple double bonds such as linolenic (LLA) and linoleic (LEA) or pyridine moieties 6-methylpyridine-2-carboxylic acid, isonicotinic 3-hydroxypicolinic 6-(1-piperidinyl)pyridine-3-carboxlic acid (PPCA). Both groups can be reacted noble metal compounds to form catalytically active species in exterior magnetic NPs, thus making them promising magnetically...
Here, a systematic study of magnetite nanoparticle (NP) formation in the presence functional polyphenylenepyridyl dendrons and dendrimers different generations structures (such as focal groups, periphery combination phenylene pyridyl moieties) has been reported. For certain dendron/dendrimer concentrations structures, well-dispersible, multi-core, flower-like crystals are formed which display ferrimagnetic-like behavior. It is noteworthy that least complex second generation with carboxyl...
We report a novel method for development of magnetically recoverable catalysts prepared by thermal decomposition palladium acetylacetonate in the presence iron oxide nanoparticles (NPs). Depending on conditions, reaction results either dispersed mixture Pd and NPs or their aggregates. It was demonstrated that loading, temperature, solvent, NP size composition are crucial to control product including degree aggregation NPs, catalyst properties. The controlled polarization magnetic forces...
For the first time we report syntheses of a family functional polyphenylenepyridyl dendrons with different generations and structures such as focal groups, periphery, combination phenylene pyridyl moieties in dendron interior using Diels–Alder approach divergent method. The structure composition were confirmed NMR spectroscopy, MALDI-TOF mass spectrometry, FTIR, elemental analysis. As proof concept that these can be successfully used for development nanocomposites, synthesis iron oxide...
Hydrogenation of levulinic acid (LA) obtained from cellulose biomass is a promising path for production γ-valerolactone (GVL)—a component biofuel. In this work, we developed Ru nanoparticle containing nanocomposites based on hyperbranched pyridylphenylene polymer, serving as multiligand and stabilizing matrix. The functionalization the nanocomposite with sulfuric significantly enhances activity catalyst in selective hydrogenation LA to GVL allows reaction proceed under mild conditions (100...
The synthesis of catalytically active bimetallic Au–Pd nanoparticles stabilized in hyper-cross-linked polystyrene (HPS) for Suzuki cross-coupling 4-bromoanisole (4-BrAn) and phenylboronic acid is presented. core–shell structure with a thin (less than 1 nm) Pd shell Au core was proven by X-ray diffraction high-angle annular dark-field scanning transmission electron microscopy combined energy-dispersive spectroscopy. More 2-fold increase 4-BrAn conversion found comparison monometallic Pd/HPS....
Here, for the first time, we developed a catalytic composite by forming thin layer of cross-linked hyperbranched pyridylphenylene polymer (PPP) on surface mesoporous magnetic silica (Fe3O4–SiO2, MS) followed complexation with Pd species. The interaction acetate (PdAc) pyridine units results in formation Pd2+ complexes which are evenly distributed through PPP layer. MS-PPP-PdAc catalyst was tested Suzuki–Miyaura cross-coupling reaction four different para-Br-substituted arenes, demonstrating...
Supercritical (SC) fluid technologies are well-established methods in modern green chemical synthesis. Using SC fluids as solvents instead of traditional liquids gives benefits higher diffusivity and lower viscosity, which allows mass transfer intensification and, thus, an increased production rate transformations. Therefore, a conjugation heterogeneous catalysis with media is large step toward chemistry. Tetralin (TL) important hydrogen donor solvent used for biomass liquefaction. In...
This paper describes synthesis of Pd-containing catalysts Suzuki cross-coupling based on amino-functionalized hyper-cross-linked polystyrene at variation Pd precursor nature (PdCl2, PdCl2(CH3CN)2, or PdCl2(PhCN)2). The investigation the influence palladium oxidation state (Pd(II) Pd(0)) and form (Pdn clusters nanoparticles) rate 4-bromoanisole phenylboronic acid is discussed. Developed are shown to allow achieving conversion higher than 98% under mild reaction conditions. Independently...
Here we report control of iron oxide and palladium nanoparticle (NP) formation via stabilization with polyphenylenepyridyl dendrons the second third generations dodecyl periphery. These nanomaterials are developed as magnetically recoverable catalysts. To accurately assess influence exterior for same dendron generation, also designed a generation partial For all studied, multicore mesocrystals were formed, sizes morphology which controlled by generation. Analysis static dynamic magnetic...
Postimpregnation of Pd nanoparticles (NPs) stabilized within hyper-cross-linked polystyrene with sodium or potassium hydroxides optimal concentration was found to significantly increase the catalytic activity for partial hydrogenation C–C triple bond in 2-methyl-3-butyn-2-ol at ambient hydrogen pressure. The alkali metal hydroxide accelerates transformation residual Pd(II) salt into Pd(0) NPs and diminishes reaction induction period. In addition, selectivity desired 2-methyl-3-buten-2-ol...
This paper is devoted to the production of second generation biodiesel via catalytic hydrodeoxygenation fatty acids. Pd/C catalysts with different metal loading were used. The palladium characterized using low-temperature nitrogen physisorption and X-ray photoelectron spectroscopy. It was revealed that most active selective catalyst 1%-Pd/C which allowed reaching up 97.5% selectivity (regarding n-heptadecane) at 100% conversion substrate. Moreover, chosen more preferable according lower...
We report a novel method for synthesis of alloy PtFe nanoparticles (NPs) different compositions using γ-Fe2O3 NPs as an iron source. show here other growth mechanisms than conventional nucleation on NP surface leading to core–shell or seeded growth. Depending reaction conditions, can be obtained. may coexist with in the product. This mixture obtained situ allows much higher catalytic activity hydrogenation methyl-3-buten-2-ol that only merely mixed and NPs. The presence both formation dense...
This paper describes the synthesis of Pd-containing catalysts based on nonfunctionalized hypercrosslinked polystyrene via impregnation with Pd acetate. Developed nanoparticulate catalyst allowed achieving conversion aryl halide up to 90% in Suzuki cross-coupling reaction under mild conditions and at absence phase-transfer agents. During selective hydrogenation triple C-C bond 2-methyl-3-butyn-2-ol, 96% selectivity respect corresponding olefinic alcohol was found 95% conversion. The...
Abstract The current work is devoted to the second-generation biodiesel production via fatty acids catalytic hydrodeoxygenation (HDO). Pd-containing catalysts based on polymeric matrix of hypercrosslinked polystyrene (HPS) with different metal loading were investigated in process. characterized by low-temperature nitrogen physisorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC)....