oxidation

Oxidation of 1,7-Octadiene by Molecular Oxygen in Liquid-Phase in the Presence of Metal Silicides at the Initial Stages

The effect of metal silicides, TiSi₂, VSi₂, MoSi₂, HfSi₂, TaSi₂ , and WSi₂, on the initial stages of the liquid-phase oxidation processes of 1,7-octadiene by molecular oxygen was investigated. It was established that the presence of a homogeneous initiator of radical processes, tert-butyl hydroperoxide, was necessary for the oxidation reaction to proceed. VSi₂ is the best catalyst for the oxidation of 1,7-octadiene by O2. VSi₂ and MoSi₂ exhibited excellent reusability over five cycles of use without significant loss in their catalytic activity.

Advances in Heterogenization of Catalysts for Fine Organic Synthesis via Catalytic Oxidation in Liquid Medium: A Review

Heterogenization of catalysts offers numerous advantages over homogeneous systems, including enhanced stability, reusability, and fine-tuning of properties. This approach is particularly relevant for developing environmentally friendly and sustainable catalytic processes. Microgels, with their unique properties, emerge as promising platforms for catalyst heterogenization. These crosslinked polymer networks exhibit tunable size, porosity, and responsiveness to external stimuli, making them ideal for encapsulating and stabilizing catalytic species.

Study of sorption of Мn2+ ions by natural clinoptilolite

The process of modification of natural clinoptilolite, pre-enriched by the main component, with manganese ions from nitrate solutions as precursors for obtaining manganese(IV) oxide was studied. The value of the sorption capacity of different fractions of clinoptilolite with respect to manganese ions at room temperature was determined, and the sorption rate and rate constants of this process were calculated. The influence of the concentration of manganese nitrate solution on the sorption capacity of certain fractions of zeolite was determined.

PRODUCTION OF PETROLEUM BITUMEN BY OXIDATION OF TAR FROM A MIXTURE OF EASTERN UKRAINIAN OILS

The study results of the process obtaining of petroleum bitumen with improved quality indicators are described. The method of mixing the tar of paraffinic oils with the residue and the distillation of Orkhiv oil with subsequent oxidation of this mixture was used. To conduct the research, tar extracted from Western Ukrainian paraffinic oils was used. The influence of temperature, oxidation duration and air consumption on the operational properties of oxidized petroleum bitumens were determined.

STUDY OF THE CATALYTIC ACTIVITY OF Mo2B IN THE REACTION OF β-ETHYL ALLYL-α-ETHYL ACRYLATE WITH tert-BUTYL HYDROPEROXIDE

Kinetic regularities of catalyst activation processes in the reaction of epoxidation of ethylallyl ethyl acrylate with tert-butyl hydroperoxide in the presence of Mo2B were investigated. It is shown that the activation of the catalyst, which takes place at the beginning of the epoxidation process, mainly occurs under the simultaneous action of tert-butyl hydroperoxide and olefin.

Composition and Activity of Copper-Palladium Catalyst on Carbon Fiber Material for Air Purification from Carbon Monoxide

A set of research methods ($X$-ray phase, desorption, kinetic) was used to determine the state of the basic components ${K}_{2}{Pd}{Cl}_{4}$ and $Cu(NO_3)_2$ in the catalyst for the oxidation of carbon monoxide by oxygen. It was found that the palladium (II) and copper (II) initial compounds under the action of carbon fiber carrier change their state. Palladium is reduced to $X$-ray amorphous $Pd^0$, and copper (II) is in the form of a crystalline phase ${Cu}_2(OH)_3Cl$.

Activation of Mo2B Catalyst in the Epoxidation Reaction of α-Ethylallyl Ethyl Acrylate with tert-Butyl Hydroperoxide

The regularities of Mo2B catalyst activation in the epoxidation reaction of $\alpha$-ethylallyl ethyl acrylate with tert-butyl hydroperoxide have been studied. It has been shown that the catalyst activation process is described by the Avrami-Erofeev topokinetic equation and  includes two successive stages – the nucleation and formation of a new phase active in the epoxidation reaction. The forma- tion of epoxy only occurs in the presence of the activated form of the catalyst. The effective and topochemical process constants have been calculated.

Рerfluorinated sulfamides in the oxidation process of cyclohexane

Ways of using perfluorinated sulfonamides in various technological processes are considered. The possibility of using aminotoxane as a catalyst in the process of cyclohexane oxidation was studied. Various technological parameters of the use of the binary catalytic system: cobalt naphthenate - aminotoxane in the process of cyclohexane oxidation and their influence on the main indicators of this process were studied.

Influence of reaction conditions on the selectivity of the process of epoxidation of oct-1-ene by tert-butyl hydroperoxide in the presence of МоВ

The influence of the reaction conditions on the selectivity of the interaction of oct-1-ene with tert-butyl hydroperoxide in the presence of MoB was investigated. It is shown that the selectivity of 1,2-epoxyoctane formation can vary depending on the reaction conditions.With the participation of the activated form of the catalyst, the selectivity increases significantly, but does not reach 100%. The optimal reaction conditions under which the selectivity of 1,2-epoxyoctane formation exceeds 90% have been established.

Influence of Amino Acids and Alcohols on Catalytic Oxidation of Cyclohexane

Conducted experiments and collected data show that use of catalytic systems that contain individual amino acids and industrial catalyst – solution of cobalt naphtenate with cyclohexanone – have certain influence on the process of liquid-phase homogeneous oxidation of cyclohexane. The results of spectral studies of binary catalytic systems based on NC using additives of different nature (alcohols and nitrogen-containing modifiers) allow us to propose structural formulas of catalytic complexes.