каталізатор

Modification of the Catalytic System for the Industrial Chlorine Processing of Ethylene in 1,2-Dichloroethane

A new mechanism for the reaction of direct (additive) chlorination of ethylene with chlorine from the formation of 1,2-dichloroethane in the presence of FeCl3 catalyst promoted by NaCl has been proposed. It was found that the rate depends on the active phase concentration of the catalyst and the promoter, as well as the formation of the Na[Fe(C2H4Cl)4] complex, which is a surface intermediate of the reaction.

The Non-Sodium Nickel Hydroxycarbonate for Nanosized Catalysts

The samples of non-sodium nickel hydroxycarbonate for nanosized catalysts have been obtained and investigated. The ratio of crystalline water, the amount of nickel hydroxide and carbonate has been calculated. By the X-ray analysis of obtained nickel oxide the crystallite size of 12–13 nm has been determined. The samples of catalysts provided a high specific surface.

INFLUENCE OF HYDROPEROXIDE EPOXIDATION REACTION CONDITIONS OF OCTEN-1 ON THE PROCESS OF Mo2B ACTIVATION AND ON THE SELECTIVITY OF EPOXIDE FORMATION

A study of the process of activation of molybdenumboride catalyst in the reaction of epoxidation of octene-1 with tert-butyl hydroperoxide and the effect on this process of the initial concentration of octene-1, tert-butyl hydroperoxide and the amount of catalyst in the reaction mixture. As well as reaction products (tert-butyl alcohol and epoxy). It is shown that over time a new amorphous phase is formed on the surface of Mo2B, which actually catalyzes the epoxidation reaction of octene-1 with tert-butyl hydroperoxide.

ZnCl2-Catalyzed Four-Component Domino Reaction for One-Pot Eco-Safe and Convenient Synthesis of Polyfunctionalized Dihydro-2-oxopyrroles at Ambient Temperature

In this study, ZnCl2 was applied as an environmentally friendly and efficient Lewis acid catalyst for the one-pot four-component synthesis of polysubstituted dihydro-2-oxopyrroles from the reaction between dialkyl acetylenedicarboxylate, formaldehyde and amines (aromatic and aliphatic) at ambient temperature. This methodology has a number of advantages such as use of inexpensive, eco-safety of catalyst, short reaction times, high yields, easy work-up (just simple filtration), and simplicity of operation.

Synthesis Mechanism and Properties of Epoxy Resins Modified with Adipic Acid

The mechanism of diepoxide and adipic acid (AA) reaction in the presence of benzyltriethylammonium chloride and 1,4-diazobicyclo[2,2,2] octane has been proposed. The thermal stability of the oligoester obtained via chemical modification of the dioxydiphenylpropane diglycidyl ether with AA and epoxy-oligoesteric mixtures with its participation has been studied. The viscoelastic properties of films based on epoxy-oligoesteric mixtures containing Epidian-5 epoxy resin, TGM-3 oligoesteracrylate, AA modified Epidian-5 and polyethylpolyamine 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.

The Reaction of Oleic Acid with a Mixture of Ethanolamines

Regularities of the reaction of oleic acid with a mixture of ethanolamines have been investigated under non-stationary conditions in the presence of H-form of cation-exchange resin KU-2-8 as a catalyst. The effect of a ratio between reagents and the catalyst on the acid conversion, selectivity and products yield has been determined. N-acylation of mono- and diethanolamines by an oleic acid was found to be more intensive compared with esterification of hydroxy groups of ethanolamine.

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.

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

Кінетичні закономірності окиснення октену-1 молекулярним киснем у присутності біметалевого гомогенного каталізатора [(Allyl)ClPd(CN)Ru(Py)4(CN)PdCl(Allyl)]

Вивчено вплив концентрацій октену-1, гомогенного ініціатора (гідропероксиду трет-бутилу) та біметалевого гомогенного каталізатора [(Allyl)ClPd(CN)Ru(Py)4(CN)PdCl(Allyl)] на перебіг початкових стадій реакції рідиннофазного окиснення октену-1 молекулярним киснем. Показано наявність каталітичної та некаталітичної складової у процесі окиснення. Встановлено, що порядок реакції за гідропероксидом і октеном дорівнює oдиниці, тоді як за каталізатором – є менший від одиниці. Розрахована ефективна константа швидкості.