A5008840106- Zeolite Catalysis and Synthesis
- Mesoporous Materials and Catalysis
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Catalysis and Hydrodesulfurization Studies
- Advanced NMR Techniques and Applications
- Catalysis for Biomass Conversion
- Chemical Synthesis and Characterization
- NMR spectroscopy and applications
- Advanced Photocatalysis Techniques
- Catalysts for Methane Reforming
- X-ray Diffraction in Crystallography
- TiO2 Photocatalysis and Solar Cells
- Crystallization and Solubility Studies
- Clay minerals and soil interactions
- Metal-Organic Frameworks: Synthesis and Applications
- Analytical Chemistry and Chromatography
- Gas Sensing Nanomaterials and Sensors
- Polyoxometalates: Synthesis and Applications
- Glass properties and applications
- Chemical Synthesis and Reactions
- Luminescence Properties of Advanced Materials
- Asymmetric Hydrogenation and Catalysis
- Protein purification and stability
- Advanced Chemical Sensor Technologies
Lomonosov Moscow State University
2015-2024
Russian Academy of Sciences
2015-2024
A.V. Topchiev Institute of Petrochemical Synthesis
2015-2024
Moscow State University
2005-2023
Voronezh State Technical University
2023
Institute of Biomedical Chemistry
2023
Voronezh State University
2023
Ural Branch of the Russian Academy of Sciences
2022
Institute of Solid State Chemistry
2022
Kazan State Technological University
2019-2020
Abstract The synthesis of buta‐1,3‐diene from ethanol has been studied over metal‐containing (M=Ag, Cu, Ni) oxide catalysts (MO x =MgO, ZrO 2 , Nb O 5 TiO Al 3 ) supported on silica. Kinetic study a wide range conversions (2–90 %) allowed the main reaction pathways leading to butadiene and byproducts be determined. key steps were found involve dehydrogenation, acetaldehyde condensation, reduction crotonaldehyde with into crotyl alcohol. Catalyst design included selection active components...
The synthesis of butadiene-1,3 from ethanol over silver doped (1 wt%) Zr-containing molecular sieves ZrBEA, ZrMCM-41 and ZrO<sub>2</sub> supported on silica has been studied.
Fourier transform infrared spectroscopy and density functional theory calculations have been used to elucidate the nature of active sites ZrBEA zeolite responsible for catalytic synthesis butadiene. We show that content open Zr(IV) Lewis acid sites, represented by isolated Zr atoms in tetrahedral positions crystalline structure connected three −O–Si linkages one OH group, correlates with activity process conversion ethanol into The higher is attributed their strength steric accessibility....
Long-term investigations of the photocatalytic hydrogen production on platinized TiO2 photocatalysts have been carried out employing different solutions (deuterated) water and methanol. The results indicate that methanol acts as a sacrificial reagent, i.e., an "electron donor" amount evolved molecular is equivalent to H2 expected from complete reforming or even less depending used photocatalyst. No evidence for splitting observed in presence very low concentrations, no oxygen has detected....
Abstract A silica‐supported Ag catalyst has been shown to be an efficient heterogeneous for the oxidant‐free dehydrogenation of ethanol into acetaldehyde. The reaction mechanism investigated by in situ FTIR spectroscopy. kinetic isotope effects proton and hydride abstraction have studied using CH 3 CD 2 OH OD as labeled reactants. results indicate that OH bond activation formation a hydrogen‐bonded complex take place on silica support particles are necessary CH bond. effect ( k H / D ) is...
The Lewis acid properties of a series isolated and well-defined Zr centers in ZrBEA zeolites with different Si/Zr ratio ZrO2 supported on silicious BEA have been investigated by means IR spectroscopy adsorbed probe molecules. Different types detected assigned to (i) 4-fold coordinated atoms framework positions that weakly interact bases (closed site), (ii) stronger sites associated one Zr–OH hydroxyl group resulting from the hydrolysis Zr–O–Si bond (open site). It has shown deuterated...
Abstract 1,3‐Butadiene was synthesized from ethanol using zirconium‐containing zeolite beta (ZrBEA) catalysts doped with 1 wt % silver. The Zr planted post‐synthesis modification by dealumination of the parent followed treatment ZrOCl 2 in a DMSO solution. FTIR and NMR spectroscopy were used to investigate planting process preparing materials different Si/Al ratios crystal sizes. results showed preferential grafting terminal silanols present on external surface crystals instead incorporation...
The early stages of methane activation over Zn-modified H-MFI catalysts obtained by high-temperature reaction with zinc vapor have been studied 13C MAS NMR in situ. Methane 99.9% enriched was used as labeled reactant. spectroscopic data pointed to formation methyl species at ambient temperature just after adsorption onto the zeolite sample. results suggest that occurs via dissociative acid−base Zn−O pairs involving Zn2+ cations and negatively charged oxygen atoms framework. nature sites...
We describe a general synthesis strategy, which combines sol–gel and hydrothermal processes, for the large-scale of porous perovskite titanates spheres with tunable particle size inner structures. Amorphous hydrous TiO2 solid (AHTSS) are first synthesized by method then used as precursor template subsequent reaction alkaline earth metal ions in an medium. This strategy can be generalized to synthesize various (i.e., SrTiO3, BaTiO3, CaTiO3) consisting single-crystalline nanocubes. By...
Abstract Time‐resolved 13 C, 23 Na, 27 Al, and 29 Si MAS NMR has been applied in situ for monitoring the hydrothermal synthesis of zeolite BEA. Isotopic labelling with C isotopes used to follow fate siliceous species structure directing agent (( CH 3 −CH 2 ) 4 NOH). Two mechanistic pathways, namely solution‐mediated solid–solid hydrogel rearrangement have distinguished two procedures studied. The mechanisms structure‐directing behavior TEA + cations reaction pathways elucidated. results show...
13C MAS NMR has been performed in situ to investigate the mechanism of toluene alkylation with methanol (MeOH) or dimethyl ether (DME) at 433 K over H−ZSM-11 catalyst. The reaction protocol used allowed separate main stages: MeOH and DME adsorption, activation, toluene. In both cases, five strongly bound species were identified upon activation K, namely, side-on end-on adsorption complexes methoxy species. End-on adsorbed found be reactive alkylation, reactivity being much higher.
Titania modified nanoparticles have been prepared by the photodeposition method employing platinum particles on commercially available titanium dioxide (Hombikat UV 100). The properties of photocatalysts were investigated means Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), atomic force microscopy (AFM), and UV-visible diffuse spectrophotometry (UV-Vis). XRD was employed to determine crystallographic phase particle size both bare platinised dioxide. results...