T. L. Rakitskaya

Carbon-fibrous-material-supported base catalysts of ozone decomposition

It has been found that a carbon fibrous material characterized by the developed porous structure and predominance of basic surface groups, being a catalyst of low-temperature ozone decomposition, is also a suitable support for liquid-phase base (X−) catalysts (X−=OH−, Br− and I−). The data obtained in the reaction kinetics study at an initial ozone concentration ranging from 3.1×10−8 to 3.1×10−7 mol/l show that the support raises considerably the activity of the base catalysts. The catalytic activity decreases in the following series: I−>Br−>OH−.

Antiozonant activity of the silica modified with 3d metal complexes

Criteria for preliminary selection of the antiozonants based on the silica modified with the complexes of 3d metal were proposed and the activity of the antiozonants as a dependence on the nature of the ligands (Schiff bases, Cl−, NO3−) and metal ions [Cu(II), Co(II), Mn(II)] was established. We found that advantageous were complexes MnL2/

Solid-state catalysts based on bentonites and Pd(II)-Cu(II) complexes for low-temperature carbon monoxide oxidation

\overline {Si}

Phase Composition and Catalytic Activity of Nanostructured Materials Based on Solid Component of Welding Aerosol

, where L denotes a Schiff base of phenol or quinoline series, whose kinetic and specific stoichiometric energy parameters of the reaction were the largest because of the formation during the reaction of the manganese oxide form which performs the catalytic decomposition of ozone.

Adsorption-desorption properties of bazalt tuff and catalytic activity of acido complexes of palladium(II) and copper(II) in the reaction of carbon(II) oxide oxidation with oxygen

The results of testing of Pd(II)-Cu(II)/Bent catalyst samples in the reaction of CO oxidation with air oxygen are presented. Bentonites from three Ukrainian deposits: Gorbskoye, Dashukovskoye, and Kirovogradskoye were used as supports. Natural bentonites, their modified forms, and the catalysts based on them were characterized by X-ray diffraction phase analysis, FT-IR spectroscopy, and chemical analysis. It has been found that the activity of Pd(II) Cu(II)/Bent catalysts increases with increasing amorphous silica content and with decreasing pH of their water suspensions.

Effect exerted by acid modification of bazalt tuff on catalytic activity of fixed acido complexes of palladium(II) and copper(II) in the reaction of carbon(II) oxide oxidation with air oxygen

The comparison of the phase compositions and catalytic properties of the solid components of welding aerosol (SCWAs) obtained as a result of metal welding by two types of electrodes, ANO-4 and TsL‑11 was made. Their phase compositions were investigated by X-ray diffraction phase analysis, IR spectroscopy, and pH-metry. The catalytic properties of SCWAs were studied in the low-temperature reaction of ozone decomposition. Both SCWA samples were found to purify the ozone-air mixtures (OAM) from ozone at its concentration of 1 mg/m3 to the levels below the maximum permissible concentration (MPCO3) however the protective time of SCWA-ANO-4 (50 h) was higher than that of SCWA-TsL-11 (3 h) because of the differences in their compositions

Schiff bases containing metal complexes anchored on aerosil as catalysts of low-temperature ozone decomposition

Desorption of palladium(II) and copper(II) from the K2PdCl4-Cu(NO3)2-KBr/H-BT-6 catalysts, in which bazalt tuff from various deposits subjected to acid modification is used as carrier, was studied.

Natural Clinoptilolite Based Solid-State Compositions for Low-Temperature Air Purification from Sulphur Dioxide

The physicochemical and structural characteristics of bazalt tuff were studied. The optimal conditions of its acid modification, at which the high-activity catalyst Pd(II)-Cu(II)-Br-/H-bazalt tuff of a low-temperature oxidation of carbon(II) oxide with air oxygen is formed, were determined.

Solid-state compositions for low-temperature sulphur dioxide oxidation consisting of natural clinoptilolite, copper(II) and halide ions

As found on the base of the data on kinetics of ozone decomposition by A-300 aerosil anchored metal complex compounds, ML2 (L—a Schiff base, namely azomethine of salicylic aldehyde and amine), the activity of the latter altered depending on a nature of metal as follows: Mn2+>Cu2+>Fe2+≊Zn2+. IR spectra and EDRS have proved the destruction of the ligand, L, by ozone. This was accompanied by formation of complexes inactive in the reaction.

Nanostructured materials based on the solid component of welding aerosol as catalysts for low-temperature ozone decomposition

Natural clinoptilolite (N-CLI) and N-CLI based solid-state compositions containing copper(II) chloride and halide ions (X- = Cl-, Br- or I-) were investigated by X‑ray diffraction phase analysis, IR spectroscopy, thermogravimetry, water vapour adsorption, and pH‑metry. After that, they were tested in the reaction of low-temperature sulphur dioxide oxidation with air oxygen. It has been found that N-CLI has no protective properties in respect of sulphur dioxide whereas CuCl2‑KX/N-CLI compositions have the significant protective activity in the process of air purification from sulphur dioxide increasing in the order Cl- < Br- < I-.