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Nikolay Cherkasov

Nikolay Cherkasov
Stoli Chem

PhD
We are making chemical production faster, simpler, and more sustainable in scalable multipurpose continuous reactors.

About

55
Publications
11,246
Reads
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1,142
Citations
Introduction
Nikolay Cherkasov currently works at the School of Engineering, The University of Warwick. The research focuses on the reactor design in relation to the heterogeneously-catalysed-reactions.
Additional affiliations
February 2015 - present
The University of Warwick
Position
  • Research Associate
August 2013 - January 2015
University of Hull
Position
  • Post-Doctoral Research Assistant

Publications

Publications (55)
Article
Full-text available
The selectivity of palladium catalyzed hydrogenation can be improved by adding a homogeneous modifier (or poison) such as quinoline to the reaction mixture. Although such selectivity improvement by modifiers (selective...
Article
Full-text available
This article belongs to the Special Issue Feature Papers in Reactions. The paper compares conceptual designs of a microstructured reactor/heat-exchanger for the small-scale production of C8+ range hydrocarbons from methanol over H-ZSM-5 catalytic coatings. In these designs, air was used as a cooling fluid in the adjacent cooling channels. The heat...
Article
Packed-bed reactors are one of the simplest and most widely used reactors in chemical processes. Although simple, the random packing of solid particles can lead to inadequate heat and mass transfer, high pressure drop caused by suboptimal fluid pathways. A combination of a structure with random packing provides simplicity with designed fluid paths...
Article
Ammonia, being the second largest produced industrial chemical, is used as a raw material for many chemicals. Besides, there is a growing interest in the applications of ammonia as electrical energy storage chemical, as fuel, and in selective catalytic reduction of NOx. These applications demand on-site distributed ammonia production under mild pro...
Article
Full-text available
This study demonstrates the possibility of “contactless” mass transfer between two aqueous slugs (droplets) separated by an oil slug in Taylor flow inside milli-channels. Separation of the alternating aqueous slugs at the outlet was performed by switching a couple of solenoid valves at branched outlets according to signals obtained by an optical se...
Article
Plasma-assisted ammonia synthesis in a packed dielectric barrier discharge (DBD) reactor at atmospheric pressure is presented in this work. A broad range of materials (commonly used as catalyst supports) with various chemical properties (acidic α-Al2O3, anatase TiO2 and basic MgO, CaO), surface area and porosity (α-Al2O3 and γ-Al2O3), dielectric pr...
Article
This report discusses the easy and cheap preparation of SnCl 2 exchanged Brønsted acidic Amberlyst-15 ion exchange resin prepared by ion exchange of an aqueous SnCl 2 solution at room temperature. The prepared materials were tested in the conversion of sugars, being glucose, fructose and saccharose to 5-HMF at low temperature conditions (120°C) and...
Article
Full-text available
A ytterbium–organic framework containing Lewis and Brønsted acid sites that effects transformation of glucose to 5-HMF in water at 140 °C.
Article
ZSM-5 catalysts were subjected to step response cycles of dimethyl ether (DME) at 300 °C in a temporal analysis of products (TAP) reactor. Propylene is the major olefin and displays an S-shaped profile. A 44-min induction period occurs before primary propylene formation and is reduced upon subsequent step response cycles. The S-shaped profile was i...
Data
Relevant details about the TAP reactor; blank experiments; characterization of ZSM-5 catalysts by XRD, SEM, and TGA; analysis procedures; spectrum of species at steady state; TPD of working catalyst; TPD of dimethoxymethane and 1,5-hexadiene; consecutive step response methodology; and transmission FTIR experiments
Article
Full-text available
The metal–organic framework MIL-101(Cr) is known as a solid–acid catalyst for the solution conversion of biomass-derived glucose to 5-hydroxymethyl furfural (5-HMF). We study the substitution of Cr3+ by Fe3+ and Sc3+ in the MIL-101 structure in order to prepare more environmentally benign catalysts. MIL-101(Fe) can be prepared, and the inclusion of...
Article
Full-text available
The polyHIPE catalysts based on styrene, vinyl benzyl chloride, and divinylbenzene co-polymerisation were functionalised with carboxylic and tertiary amine groups. Catalyst characterisation showed covalent bonding of the graft polymers. The macroporous and highly interconnected structure of polyHIPEs allows isolation of the acid and base functional...
Article
Hydrogenation of an imine (N-Cyclohexyl(benzylidene)imine) into a secondary amine (N-Benzylcyclohexylamine) was studied in catalyst-coated tube reactors to utilize the advantages of continuous-flow processes. Tetrahydrofuran (THF) was found to be an optimal solvent providing high reaction and low catalyst deactivation rates compared to toluene and...
Article
A simple and efficient method has been proposed to control the droplet size in a liquid‐liquid emulsion. Placing a metal wire along the centerline of an X‐mixer completely changes the droplet formation mechanism. Droplets gradually form when flowing along the wire with droplet separation occurring at the tip of the wire rather than at the channel i...
Article
Active site isolation in furfural (FA) hydrogenation was studied by poisoning a Pd catalyst with bismuth. A solution of FA in water was hydrogenated over a 5 wt% Pd/SiO2 catalyst in a batch reactor at various reaction temperatures and pressures. Furfuryl alcohol (FAL) was an intermediate product which was further hydrogenated into tetrahydrofurfury...
Article
Quality by Design encouraged by the US Food and Drug Administration (FDA) in continuous flow synthesis requires tight monitoring of all the reaction input and output parameters to improve reproducibility and eliminate the process rejects. Reaction monitoring, however, relies on costly (over 10000$) process analytical technology (PAT)-one of the fac...
Preprint
Full-text available
Quality by Design encouraged by the US Food and Drug Administration (FDA) in the continuous flow synthesis requires tight monitoring of all the reaction input and output parameters to improve reproducibility and eliminate the process rejects. The reaction monitoring, however, relies on costly (above 10,000$) analytical equipment-one of the factors...
Article
Flow chemistry is time-saver in the laboratory and a cost-saver in industry partly because of automation and autonomous operation. Nevertheless, a batch process is often preferred over a flow counterpart because setting up the autonomous operation may take a lot of time. In the paper, we propose a novel open-access OpenFlowChem platform based on La...
Article
Catalysts consisting of Pt and Cu supported on Mo2C/η-Al2O3, Mo2C/γ-Al2O3or Mo2C were prepared and used for the low-temperature water gas shift reaction (WGSR). The catalysts were characterized by elemental analysis, powder X-ray diffraction (XRD), temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) and scanning electron...
Article
Structured microchannel H-ZSM-5 catalysts containing up to 80 wt% zeolite (balance bentonite) were fabricated by unit operations of paste preparation, extrusion, drying and firing. The structured catalysts, called miniliths due to their micrometre-range dimensions, were composed of parallel cylindrical channels with a wall thickness of 200–300 μm,...
Article
Full-text available
Catalysts consisting of Pt and Cu supported on Mo2C/η-Al2O3, Mo2C/γ-Al2O3 or Mo2C were prepared and used for the low-temperature water gas shift reaction. The catalysts were characterized by elemental analysis, X-ray diffraction (XRD), temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (S...
Article
Full-text available
A novel continuous flow process for selective hydrogenation of α, β-unsaturated aldehyde (cinnamaldehyde, CAL) to the unsaturated alcohol (cinnamyl alcohol, COL) has been reported in a tube reactor coated with a Pt/SiO2 catalyst. A 90% selectivity towards the unsaturated alcohol was obtained at the aldehyde conversion of 98.8%. This is a six-fold i...
Article
Full-text available
The desorption of methanol and dimethyl ether has been studied over fresh and hydrocarbon-occluded ZSM-5 catalysts with Si/Al ratios of 25, 36 and 135 using a temporal analysis of products reactor. The catalysts were characterized by XRD, SEM, N2 physisorption and pyridine FT-IR. The crystal size increases with Si/Al ratio from 0.10 to 0.78 µm. The...
Data
Adsorption and Desorption parameters for methanol and DME using the Redhead method and the plug flow reactor model
Article
Liquid-phase hydrogenation of a solution of furfural, phenol and acetic acid has been studied in the 50–235 °C range over magnetic Ru/Fe3O4-SiO2 catalyst targeting the renewable production of second generation biofuels with minimum hydrogen consumption. Phenol was fully hydrogenated to cyclohexanol in the entire temperature range. Below 150 °C, fur...
Article
Full-text available
Semihydrogenation of 2-methyl-3-butyn-2-ol (MBY) was studied in a 5 m tube reactor wall-coated with a 5 wt % Pd/ZnO catalyst. The system allowed for the excellent selectivity towards the intermediate alkene of 97.8 ± 0.2% at an ambient H2 pressure and a MBY conversion below 90%. The maximum alkene yield reached 94.6% under solvent-free conditions a...
Article
A series of TiO2@SiO2@NiFe2O4 composite magnetic catalyst with a core-double shell structure was synthesized by a sol-gel method. The morphology of the catalysts was studied by XRD, SEM, N2 physisorption and their magnetic properties were examined with magnetometry, and specific absorption rate measurements. The catalytic activity was determined in...
Article
Full-text available
The two catalysts Pd3Sn/TiO2 and Pd3Sn/ZnO were prepared via a one-pot procedure based on the “polyol method” with the addition of a capping agent (polyvinylpyrrolidone) to control the particle size distribution. The same procedure was used to prepare Pd/TiO2 and Pd/ZnO for comparison. All four catalysts showed high activity and selectivity for the...
Article
The methanol-to-hydrocarbon (MTH) reaction has received considerable attention as utilizing renewable sources of both value-added chemicals and fuels becomes a number one priority for society. Here, for the first time we report the development of hierarchical zeolites (ZSM-5) containing both iron oxide and nickel oxide nanoparticles. By modifying t...
Article
A 2.5wt.% Pd/ZnO catalytic coating has been deposited onto the inner wall of capillary reactors with a diameter of 0.53 and 1.6mm. The coatings were characterised by XRD, SEM, TEM and elemental analysis. The performance of catalytic reactors was studied in solvent-free hydrogenation of 2-methyl-3-butyn-2-ol. No mass transfer limitations was observe...
Article
Full-text available
The direct synthesis of NOx from N2 and O2 by non-thermal plasma at an atmospheric pressure and low temperature is presented, which is considered to be an attractive option for replacement of the Haber-Bosch process. In this study, the direct synthesis of NOx was studied by packing different catalyst support materials in a dielectric barrier discha...
Article
Nowadays, curve fitting of unresolved (or poorly resolved) IR bands is a routine tool for quantification of catalytically active Brønsted acid sites (BAS) in zeolite catalysts. A number of experimental studies demonstrated the effect of the local environment on the catalytic properties of BAS in mordenites (MOR); these studies are rooted in IR spec...
Article
A solvent-free semihydrogenation of 2-methyl-3-butyn-2-ol (MBY) to 2-methyl-3-buten-2-ol was performed in a capillary reactor (10 m long, 0.53 mm i.d.) coated with a titania supported Pd-Bi catalyst. Several coatings with different Pd/Bi ratio have been prepared. The catalysts have been characterized with SEM, TEM, EDX, XRD analysis and N2 adsorpti...
Article
Core-shell composite magnetic catalysts TiO2@NiFe2O4 with a titania loading of 9-32 wt% have been synthesised by a sol-gel method for direct amide synthesis in a radiofrequency (RF, induction)-heated continuous flow reactor. The catalyst calcination temperature was optimised in the range of 350-500 °C and the highest activity was observed for the c...
Article
Unique three-dimensional structure of helical carbon nanotubes renders them important in polymer composites, electrode materials of electrochemical devices and microwave absorbers. The most thoroughly studied synthetic method involves hydrocarbon pyrolysis in the presence of sulphurcontaining compounds which provide coiling effect. However, sulphur...
Article
Full-text available
The selective hydrogenation of 2-methyl-3-butyn-2-ol (MBY) was performed in the presence of Lindlar catalyst, comparing conventional stirring with sonication at different frequencies of 40, 380 and 850kHz. Under conventional stirring, the reaction rates were limited by intrinsic kinetics, while in the case of sonication, the reaction rates were 50-...
Article
The effects of poisoning of Pd catalysts with Bi and annealing in a polyol (ethylene glycol) were studied on the semi- hydrogenation of 2-methyl-3-butyn-2-ol (MBY). An increase in the Pd:Bi ratio from 7 to 1 in the Bi-poisoned catalysts decreased the hydrogenation activity due to blocking of active sites, but increased maximum alkene yield from 91....
Article
Full-text available
Catalysis in microreactors allows reactions to be performed in a very small volume, reducing the environmental problems and greatly intensifying the processes through easy pressure control and the elimination of heat- and mass- transfer limitations. In this study, we report a novel method for the controlled synthesis of micrometre-thick mesoporous...
Article
The effect of environmentally benign enabling technologies such as ultrasound and microwaves on the preparation of the lead-free Pd catalyst has been studied. A one-pot method of the catalyst preparation using ultrasound-assisted dispersion of palladium acetate in the presence of the surfactant/capping agent and boehmite support produced the cataly...
Article
The unique feature of the zeolite catalysts is the presence of catalytically active acidic hydroxyls, also known as Brønsted acid sites (BAS), in the zeolite micropores of molecular dimensions. The accessibility and catalytic properties of BAS depend on their local environment, and it is therefore important to know the exact locations of BAS and th...
Article
Filamentous ribbon-like structures of highly disordered carbon of thickness 10-100 nm built from merged individual carbon nanofibers were synthesised by chemical vapour deposition from saturated ferrocene-benzene solution at 950 K. The materials obtained were characterized by electron microscopy, x-ray and electron diffraction, Raman spectroscopy a...
Article
The effect of active hydrogen accumulation on the surface of the Ni-nanodiamond catalysts has been demonstrated. Lower bound estimation of the hydrogen capacity is 1.3 wt%. Oxygen-containing functional groups on the nanodiamond surface are presumably responsible for the hydrogen accumulation.
Article
Full-text available
The possibility of scaling up the growth of multi-walled carbon nanotubes (MWCNTs) synthesized by the pyrolysis of aerosol of a ferrocene solution in benzene was experimentally and theoretically studied. The morphology and yields of the reaction products and the influence of the volume of the introduced solution and ferrocene concentration on the d...
Article
Full-text available
Based on the temperature dependence of the hyperfine parameters of the 57Fe nuclei, the qualitative and quantitative phase composition of nanocrystalline iron oxides on the surface and on the tails of the “classic” multiwalled carbon nanotubes (CNT) was investigated. From the observed temperature dependence it was shown that the contribution of the...
Article
Full-text available
Approximating the experimental data on the mass distribution of multiwall carbon nanotubes (MCNT) along a reactor, a three-step kinetic model of their synthesis in the aerosol pyrolysis of a ferrocene solution in benzene is proposed. The values of effective rate constants upon the introduction of a catalyst in situ for the reactions that are the ba...
Article
The sonochemical deposition of nickel nanoparticles onto the multiwall carbon nanotube aggregates leads to a uniformly distributed metal phase at high loadings and an average nickel crystal size of 4–8 nm at a 25–50 wt% nickel content. Its application enhances the catalytic activity of Ni/multiwall carbon nanotube material in the selective hydrogen...
Article
Full-text available
The phase composition of carbon nanotubes (CNTs) with encapsulated iron atoms was examined by 57Fe Mössbauer spectroscopy. It was shown that iron atoms were stabilized in thermodynamically stable iron carbide and oxide phases and phases that are not usual under synthesis conditions (γ-Fe and γ-Fe2O3).
Article
Full-text available
Present work points out the differences between possible tubular carbon structures: nanotubes and nanofibers, as well as describes ways of their modification for utilization for new materials design. For material characterization, XRD, XPS, Raman spectroscopy, thermal analysis, HRTEM and SEM, pore size distribution, EELS, elemental analysis and adi...
Article
Full-text available
The phase composition of carbon nanotubes (CNTs) with encapsulated iron atoms was studied by 57Fe Mössbauer spectroscopy. The synthesis of CNTs was shown to stabilize iron atoms as both thermodynamically stable iron carbide and oxide phases and phases not characteristic under synthesis conditions (γ-Fe and γ-Fe2O3). In addition, an analysis of the...

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Projects

Projects (3)
Project
The goal of this project is to efficiently dissociate highly energetic carbon dioxide gas on catalyst bed in a novel reactor design in plasma conditions through the application of high voltage source, causing gas molecules to breakdown to radical species and ionized molecules on catalyst bed
Project
This is an international collaboration addresses the problem of catalyst development with selective poisoning. The combination of automation and machine learning will allow building a platform for understanding the catalysts, make processes more efficient, and less wasteful in terms of materials, money, or energy.
Project
Synthesis of ZSM-5 coating on microchannel reactor Post synthesis: Ion-exchanging and leaching Thermal simulation within microchannel reactor