Andrei Khodakov

Andrei Khodakov
French National Centre for Scientific Research | CNRS · Unité de catalyse et chimie du solide, UMR 8181

PhD, Dr. Sci (HDR)

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219
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Publications

Publications (219)
Article
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Light olefins are important feedstocks and platform molecules for the chemical industry. Their synthesis has been a research priority in both academia and industry. There are many different approaches to the synthesis of these compounds, which differ by the choice of raw materials, catalysts and reaction conditions. The goals of this review are to...
Article
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COF-LZU1 with nanotube-like morphology has been synthesized with high crystallinity and pore volume in the presence of trimesic acid as a template. The as-synthesized COFs nanotube consists of a stack...
Article
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Predicting the impact of input process variables on chemical processes is key to assess their performance of the latter. Models explaining this impact through a mechanistic approach are rarely readily available, complex in nature and/or require long development time. With increased automation in industries and the availability of high-throughput ex...
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Growing CO2 emissions lead to global warming, which is currently one of the most challenging environmental phenomena. Direct catalytic hydrogenation to dimethyl ether over hybrid catalysts enables CO2 utilization, hydrogen and energy storage and produces sustainable fuels and an important platform molecule. In this paper, we evaluated structure–per...
Article
Nowadays, carbon dioxide is the major reason of the global climate changes. The direct CO2 hydrogenation to dimethyl ether produces an important platform molecule for synthesis of fuels and chemicals...
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The purpose of this work is the design of metal-zeolite nanocomposite catalysts for Fischer–Tropsch synthesis, containing ruthenium nanoparticles, uniformly distributed in the hierarchical BEA zeolites. The use of ruthenium avoids the formation of inert hardly reducible inert metal silicates and metal aluminates. Carbon nanotubes with supported met...
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Carbon materials have attracted increasing attention as supports for metal catalysts. Iron-containing carbon nanotubes often promoted with copper have found application in Fischer-Tropsch synthesis, which provides an alternative way for conversion of renewable feedstocks to chemicals and fuels. In carbon nanotubes, the active phase can be nanoconfi...
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Metal nanoparticles on the surface of porous supports have found numerous applications in different areas of science. Fischer-Tropsch synthesis, which proceeds on the surface of cobalt metal nanoparticles, is an efficient way to convert renewables and fossil feedstocks into alternative fuels. The stability of cobalt catalysts is an essential and ev...
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Molecular imprinting of polymer matrices enables the creation of template-shaped cavities with high affinity for molecules of given shape and size. Here we introduce a surface molecular imprinting strategy to control the hydrogenation selectivity of various aromatic molecules over a supported palladium catalyst. This strategy involves the sequentia...
Article
Carbon dioxide (CO2) is the iconic greenhouse gas and the major factor driving present global climate change, incentivizing its capture and recycling into valuable products and fuels. The 6H+/6e− reduction of CO2 affords CH3OH, a key compound that is a fuel and a platform molecule. In this Review, we compare different routes for CO2 reduction to CH...
Article
Embryonic X-ray amorphous semi-formed MFI-type zeolite units mixed with the Cu–Zn–Al catalyst have been used for the direct synthesis of dimethyl ether (DME) from syngas. The hybrid catalyst with embryonic zeolite (EZ) with the particle size of 5 nm has demonstrated superior performance in terms of activity, selectivity, and stability compared to t...
Article
Kinetic models constitute a useful tool to provide fundamental insights for catalyst development. Single-Event MicroKinetic modelling (SEMK) is a versatile strategy to assess complex reactions with a limited number of parameters. Particularly for Fischer Tropsch synthesis SEMK modeling has focused on explaining the performances of individual cataly...
Article
The cleavage of CO linkages in aryl ethers in biomass-derived lignin compounds without hydrogenation of the aromatic rings is a major challenge for the production of sustainable mono-aromatics. Conventional strategies over the heterogeneous metal catalysts require the addition of homogeneous base additives causing environmental problems. Herein, we...
Article
A brominated supported Ru catalyst was developed for the cleavage of C−O linkages in aryl ethers (reaching yield 90.3 % to monoaromatics from diphenyl ether) in lignin compounds without hydrogenation of the aromatic rings. Both selective poisoning of terrace sites and electronic promotion of defect sites contribute to the catalytic performance. Ab...
Article
Fischer-Tropsch synthesis provides an important opportunity for utilization of biomass and plastic waste. Iron catalysts are the catalysts of choice for light olefin synthesis using Fischer-Tropsch reaction. In this paper, we investigate strong promoting effects of antimony and tin on the catalytic performance of silica supported iron Fischer-Trops...
Article
The catalytic hydrogenation of CO2 to formic acid is one of the most promising pathways towards a renewable hydrogen-storage system. The reaction is usually performed in aqueous phase in the presence of basic molecules over homogeneous or heterogeneous catalysts, generating relatively dilute formate solutions (<1 M). The newly designed solid micell...
Article
Methane is one of the most abundant molecules on Earth. Most of the state-of-the-art methane chemical conversion technologies require high temperatures, they are accompanied by insufficient selectivity, carbon deposition and major production of carbon dioxide. Development of the methane conversion technologies at mild conditions is important for th...
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Fischer–Tropsch synthesis (FTS) is an essential approach to convert coal, biomass, and shale gas into fuels and chemicals, such as lower olefins, gasoline, diesel, and so on. In recent years, there has been increasing motivation to deploy FTS at commercial scales which has been boosting the discovery of high performance catalysts. In particular, th...
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Machine-Learning (ML) methods, such as Artificial Neural Networks (ANN) bring the data-driven design of chemical reactions within reach. Simultaneously with the verification of the absence of any bias in the...
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Supported metal catalysts have found broad applications in heterogeneous catalysis. In the conventional bifunctional catalyst, the active metal sites are associated with the metal nanoparticles, while the acid sites are usually localized over the oxide support. Herein, we report a novel type of supported metal bifunctional catalyst, which combined...
Article
Design of new efficient membranes from sustainable sources such as coal fly ash (CFA) has been receiving rapidly growing attention. In the present work, alumina-based tubular asymmetric membranes were incorporated with different amounts of CFA using the centrifugal casting technique. The amount of CFA added to the matrix of the alumina tubes was va...
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Methane activation and utilization are among the major challenges of modern science. Methane is potentially an important feedstock for manufacturing value-added fuels and chemicals. However, most known processes require excessive operating temperatures and exhibit insufficient selectivity. Here, we demonstrate a photochemical looping strategy for h...
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Metal nanoparticles for heterogeneous catalytic reactions are often supported by porous materials. The catalytic performance of supported catalysts usually depends on the size of the metal nanoparticles and catalytic support. Selective synthesis of valuable primary amines is an important target in the modern industry. In this work, the catalytic pe...
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Liquid metals are a new emerging and rapidly growing class of materials and can be considered as efficient promoters and active phases for heterogeneous catalysts for sustainable processes. Because of low cost, high selectivity and flexibility, iron-based catalysts are the catalysts of choice for light olefin synthesis via Fischer-Tropsch reaction....
Article
Promotion with small amounts of different elements is an efficient strategy for the enhancement of the performance of many heterogeneous catalysts. Supported cobalt catalysts exhibit significant activity in the synthesis of primary amines via alcohol amination with ammonia, which is an economically efficient and environmentally friendly process. In...
Article
Supported cobalt and nickel nanoparticles are commonly used as catalysts in the modern chemical industry. Traditional methods of catalyst preparation such as impregnation or precipitation lead to formation of relatively large metal nanoparticles (15-30 nm). Design of supported metal catalysts with higher dispersion is expected to result in major ra...
Article
Supported metal catalysts have found numerous applications in many catalytic reactions, including Fischer-Tropsch synthesis. Metal dispersion, metal reducibility, catalytic performance and catalyst stability are usually strongly affected by the interaction of active phase and support. A strong metal support interaction has been previously reported...
Article
In this work, 29 elements were evaluated as promoters for silica supported iron catalysts for high temperature Fischer-Tropsch using a high-throughput experimentation unit. The selected promoters include alkali/alkaline metals, transition metals, precious metals and lanthanides. Several general selectivity trends were observed and discussed. The se...
Article
Supported cobalt catalysts are catalysts of choice for synthesis of paraffinic hydrocarbons from carbon monoxide and hydrogen. In this paper, the number and intrinsic activity of cobalt nanoparticles promoted with Pt localized in zeolites with different structure and pore diameter (ZSM-5, MOR and BEA) have been investigated by steady state isotopic...
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Catalytic N-alkylation of amines by alcohols to produce desired amines is an important catalytic reaction in industry. Various noble metal-based homogeneous and heterogeneous catalysts have been reported for this process. Development of cheap non-noble metal heterogeneous catalysts for N-alkylation reaction would be highly desirable. Hereby, we pro...
Article
Fischer-Tropsch synthesis has two main challenges related to direct production of gasoline fuels. First, the chain length distribution of the products follows a broad and unselective Anderson-Schulz–Flory distribution. Second, mostly linear hydrocarbons are formed in the Fischer-Tropsch reaction, thus requiring isomerization while manufacturing gas...
Article
In the present paper, we uncovered aqueous phase Fischer-Tropsch reaction over rhodium catalysts. The reaction results in synthesis and consecutive separation of hydrocarbons and oxygenates into two phases. Use of...
Article
The nanostructure of a semiconductor is a crucial parameter for efficient photocatalytic performance. Hereby, we have synthesized monoclinic bismuth vanadate (BiVO4) crystals with controlled ratio of {010} and {110} facets. The selective deposition of CuOx and CoOx over {010} and {110} facets has been performed using photo‐reduction and photo‐oxida...
Article
Light olefins are important building blocks in chemical industry. High temperature Fischer-Tropsch synthesis provides a remarkable opportunity for direct synthesis of light olefins from syngas derived from a wide range of alternative feedstocks (biomass, organic or plastic wastes, natural gas, shale gas or coal). The present work focuses on the com...
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Metal-zeolite nanocomposites are extensively used in heterogeneous catalysis. The small size of zeolite micropores and non-uniform distribution of the metal component within the zeolite structure can severely reduce the efficiency of these catalysts. In this work, we propose a new single-pot synthesis strategy for the design of metal-zeolite nanoco...
Article
Selective synthesis of valuable primary amines is an important target in modern industry. Amination of alcohols with ammonia is an economically efficient and environmental friendly process for primary amines synthesis. This consecutive reaction yields a mixture of primary, secondary and tertiary amines. High selectivity to primary amines is an impo...
Article
Light olefins are important products of high temperature Fischer-Tropsch synthesis over iron catalysts. In this paper, we found that the catalytic performance of iron catalysts was strongly affected by iron nanoparticle size, their encapsulation inside of carbon nanotubes and promotion with bismuth or lead. The presence of promoters and iron nanopa...
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Metal-zeolite composite catalysts have found numerous applications in adsorption, gas separation, petroleum refining and chemical industry. The key issue in the design of these catalysts is localization of the metal within the zeolite structure. This paper focuses on a new approach to the synthesis of nickel–zeolite composite catalysts selectively...
Article
Nano-crystalline synthetic gismondine modified via cation exchange has been utilised as a highly active and selective catalyst for the production of biofuel. In comparison with low silica zeolites FAU and LTA, K-form of gismondine, based on the maximum aluminium P (MAP) zeolite, exhibited a significant improvement in catalytic performance in the me...
Article
Selective synthesis of ethers from biomass-derived carbonyl compounds is an important academic and industrial challenge. The existing processes based on strong acid or metallic catalysts cannot provide high selectivity to ethers due to the occurrence of side reactions. Hereby we propose a Pd-I bifunctional heterogeneous catalyst for selective reduc...
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Chemical utilization of vast fossil and renewable feedstocks of methane remains one of the most important challenges of modern chemistry. Herein, we report direct and selective methane photocatalytic oxidation at ambient conditions into carbon monoxide, which is an important chemical intermediate and a platform molecule. The composite catalysts on...
Article
Dimethyl ether is one of the most promising environmentally optimized alternatives to the conventional fossil fuels and an important platform molecule for chemical industry. Catalyst deactivation is one of the most important challenges of the single-step dimethyl ether synthesis from syngas. Because of the lack of direct characterization techniques...
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The development of ceramic membranes for the most diverse separation processes has gained high visibility, mainly due to their better performance in harsh environments in comparison to polymeric materials. Among the different techniques used to prepare tubular ceramic membranes, the centrifugal casting (CC) is interesting for obtaining highly homog...
Article
Carbon monoxide hydrogenation over Co and Ni catalysts has provided important opportunities to store energy and to manufacture alternative renewable transportation fuels. Catalyst deactivation is one of the most serious issues restricting application of this reaction. Hereby, we propose a simple and efficient way to enhance the stability of support...
Article
The reaction rates and selectivity of many metal-catalyzed reactions depend on the size of the metal particles in the nanoscale range. Primary amines are important platform molecules in the chemical industry. In this work, the catalytic performance of nonsupported Ru nanoparticles with sizes from 2 to 9 nm was investigated in direct amination of oc...
Article
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Cobalt distribution between the external surface and micropores and acidity of the large pore BEA zeolite were controlled by choosing the sequence of impregnation and ion exchange procedures. Higher concentration of ion exchangeable cobalt was observed in the catalyst prepared by ion‐exchange of the zeolite proton form. The presence of Na+ instead...
Article
Light olefins are important platform molecules in chemical industry. Fischer-Tropsch synthesis provides an alternative technology for direct synthesis of light olefins from syngas, which can be generated from renewable feedstocks such as organic waste, used plastics and biomass. The Bi- and Pb-promoted iron catalysts supported by carbon nanotubes h...
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This paper focuses on the effect of synthesis conditions on the structure of cobalt-ZSM-5 zeolites, localization, dispersion and reducibility of cobalt species and their catalytic performance in Fischer-Tropsch synthesis. The zeolite catalysts were prepared using carbon nanotubes as sacrificial templates. Addition of pristine carbon nanotubes resul...
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A shift of selectivity to long chain α-olefins has been observed during Fischer-Tropsch synthesis over Co catalysts in the presence of carboxylic acids. The total selectivity to α-olefins of 39...
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A new strategy for the synthesis of metal–zeolite nanocomposite materials containing metal nanoparticles only in the zeolite pores is proposed. These materials were first prepared by zeolite impregnation with metal salts which resulted in metal species located both inside the zeolite pores and on the zeolite outer surface. Then, the metal oxide nan...
Article
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In this work, alumina-supported cobalt (Co/Al2O3) catalysts were prepared using new solvent-free mechanochemical synthesis methods: low-energy vibratory ball milling (Fritsch, Pulverisette 0) and high-energy planetary ball milling (Retsch, PM 100). γ-Al2O3 supports and Co/Al2O3 catalysts after mechanochemical treatments were characterized using a c...
Article
High temperature Fischer-Tropsch synthesis represents a sustainable alternative for direct light olefin synthesis from syngas derived from fossil and renewable feedstocks. It is found that the promotion of iron catalysts with metals used for soldering (Bi and Pb) results in a remarkable increase in the light olefin production rate with a possibilit...
Chapter
Emissions of greenhouse gas from human activities, such as industrial processes, combustion of fossil fuels for energy and transportation are major reasons of today's climate changes. Carbon dioxide is the main component of greenhouse gases. In recent years, major scientific and technological efforts have been focused on carbon dioxide utilization...
Article
Fischer-Tropsch synthesis produces light olefins and long chain hydrocarbons from syngas generated from fossil and renewable feedstocks. Molybdenum carbide exhibits catalytic properties approaching those of metal catalysts in a number of hydrogenation reactions. The present paper focuses on the effect of promotion with potassium on the structure an...