окиснення

Molecular Modelling of Acridine Oxidation by Peroxyacids

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.

Kinetics of Os(VIII) Catalyzed Oxidation of 2-Pyrrolidine Carboxylic Acid in Alkaline Medium using Sodium Periodate as Oxidant: A Mechanistic Approach

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.

Low-Pressure Discharge Plasma Treatment of Aqueous Solutions with Mn, Cr and Fe

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.

Low Temperature Acrolein to Acrylic Acid Oxidation with Hydrogen Peroxide on Se-Organic Catalysts

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.

Research of the Process of Liquid Phase Selective Oxidation of 4-Aminotoluene with Ozone

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.

About the correlation to activity of catalyst of Mо2B and selectivity of formation of epoxide in reaction of epoxidation oct-1-ene with tert-butyl hydroperoxide

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.

CATALYTIC OXIDATION OF CYCLOHEXANE IN THE PRESENCE OF SUBSTANCES THAT AFFECT ON THE SURFACE TENSION

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.

IMPROVEMENT OF HOMOGENEOUS CATALYTIC PROCESS OF OXIDATION OF ALKYLAROMATIC COMPOUNDS BY COMBINATION OF BINARY CATALYTIC SYSTEMS AND ULTRASOUND TREATMENT

Article is devoted to research of impact of combined use of catalytic systems based on
industrial oxidation catalysts and surface-active compounds of different nature (ion- and noniongenic)
with ultrasonic treat ment of reaction mixture at alkylaromatic compounds liquidphase
oxidation process. Obtained results showed that combined use of catalytic system and
ultrasound has impact on ethylbenzene oxidation. Created catalytic systems not only increase
productivity of reaction volume (for aim products), but also allow to shift process selectivity

ACTIVATION OF Мо2В CATALYST IN OCT-1-ENE EPOXIDATION WITH TERT-BUTYL HYDROPEROXIDE

The activation of Mo2B catalyst in the epoxidation of oct-1-ene with tert-butyl
hydroperoxide was researched. Dependences of the initial rate of hydroperoxide consumption
on the initial concentration of octene-1, tert-butyl hydroperoxide and the amount of catalyst in
the reaction mixture in the presence of an unactivated form of the Mo2B catalyst were studied.
The activation process can be described by the Avraami-Erofeev topokinetic equation and
includes two successive steps, viz., the nucleation and formation of a new active phase. The