Cyclohexane oxidation is object of this research. One of the most problematic points of this process is low conversion of raw material and low selectivities for aim-products at conversions higher than 4%. One of the reasons for this is absence of modern effective catalytic systems that could increase mentioned indexes. One of the directions of solving these problems is the creation of a technology for the integrated use of the obtained oxidation products on the basis of the developed new effective catalytic systems, which will enable to increase the selectivity of the process.
The optimal geometric structure and reactivity of some peroxyacids, acridine and products of their interaction were calculated by quantum-chemical methods. It was found that the heat of formation of peroxyacids (PA) and carboxylic acids (CA) grow with increasing length of a hydrocarbon radical. The dependencies of the area of PA and molecules of CA on the number of carbon atoms in the molecules are linear. The potentials of ionization of all studied PA are close and lie within the range of 11.22–11.39 eV depending on the calculation methods.
The present paper deals with the kinetic and mechanistic investigation of Os(VIII) catalyzed oxidation of 2-pyrrolidinecarboxylic acid by sodium periodate (NaIO4) in alkaline medium in the temperature range of 303‒318 K. The experimental result shows a first order kinetics with respect to Os(VIII) and periodate while positive effect with respect to substrate i.e., 2-pyrrolidinecarboxylic acid was observed. The reaction showed negative effect for [OH-]. Negligible effect of Hg(OAc)2 and ionic strength of the medium was observed.
The effect of low-pressure glow discharge on the formation of peroxide and the degree of oxidation of Mn, Cr and Fe was studied in the aqueous solutions of different compounds. The plasma treatment causes the reduction of Mn(VII) through Mn(IV) to Mn(II), Cr(VI) to Cr(III) and oxidation of Fe(II) to Fe(III). Among other reactive species, peroxide formed under the action of plasma treatment takes an active part in redox reactions. The concentration of peroxide usually increases with treatment time, but its presence is detected only after completion of active redox processes.
Catalytic performance of Se-containing organic substances, namely methylseleninic acid, benzeneseleninic acid, phenylselenol and diphenyldiselenide, has been tested as potential catalysts for unsaturated aldehydes oxidation by hydrogen peroxide. All tested substances proved to be active in the acrolein oxidation reaction but showed different efficiency regarding used solvents and the products of reaction – acrylic acid or methyl acrylate. Optimal catalyst, reaction conditions and solvent for acrylic acid synthesis have been determined.
According to the results of studying of kinetic relationships and mechanism of the process of catalytic oxidation of 4-aminotoluene with ozone in the liquid phase, the basis of the technology of 4-aminobenzyl alcohol and 4-aminobenzaldehyde have been developed. It has been shown that under the ozonation conditions in the solution of acetic anhydride in the presence of sulfuric acid, manganese(II) acetate or its mixture with potassium bromide it is possible to stop oxidation at the stage of forming 4-aminobenzyl alcohol or aldehyde.
The article deals with the results of the experiments and studies of nitric acid units in industry and establishes the patterns in NO oxidation under dynamic conditions in a gas phase and on the surface of phase separation considering also packing options.
This work is dedicated to the study of change of composition of surface of catalyst of Мо2В in the reaction of epoxidation of oct-1-ene tert-butyl hydroperoxide under the action of reactionary environment. And as with this process the constrained selectivity of formation of epoxide.
Presented results of x-ray phase analysis of initial and exhaust in a reaction epoxidation of standards of boride of molybdenum - Мо2В. The obtained data testify that both a weekend and exhaust catalyst contains one and that diffraction lances that answer one crystalline phase of Мо2В.
Aim. Study of the kinetics of oxidation of zirconium alloy Zr-1% Nb and Zr with heating in air, depending on the heating rate and processing time. Method. Zirconium alloy Zr-1% Nb and zirconium of vacuum remelting were chosen as the material of the studies. For the thermal treatment, a laboratory electric furnace SNOL30/1300 was used. The heating rate was varied from 2.5°C/min. up to 20°С/min., and cooled together with the furnace.
Oxidation of cyclohexane is one of few organic synthesis processes industrially made in Ukraine. Oxidation of cyclohexane is characterized by relatively low conversion of hydrocarbon (4-5%) and selectivity for aim products – cyclohexanole and cyclohexanone (around 78%). Analysis of literature data shows that the most perspective way of increasing of selectivity for aim products in cyclohexane oxidation is use of catalytic systems based on industrial catalysts and organic modifiers of different nature.