Influence of individual catalysts – oligomeric chelate complexes of cobalt and copper in the cyclohexane oxidation process was investigated. The method of of metal-complex catalysts synthesis was shown. The influence of complex oligomers and their ligands on the parameters of the cyclohexane oxidation process was analyzed.
The role of intra- and intermolecular H-bonds in mechanisms of catalysis with triple heterobinuclear hetero ligand complexes NiII(acac)2∙NaSt(LiSt)∙PhOH, including nickel and redox-inactive metal Na(Li), in the ethylbenzene oxidation by dioxygen into -phenyl ethyl hydroperoxide is discussed. The AFM method has been used for research of the stable supramolecular nanostructures formation possibility on the basis of triple complex NiII(acac)2∙NaSt∙PhOH, with the assistance of intermolecular H-bonds.
The influence of immobilized catalytic compositions, obtained by immobilization of cyanide complexes of transition metals: Ni, Pd, Pt, Со, Fe, Ru, and oxysalts of vanadium on the aluminum oxide as a carrier, on the initial stages of the liquid-phase oxidation reaction of 1-octene by the molecular oxygen was studied.
The preparation methods and main characteristics of known catalysts for carbon monoxide oxidation have been examined. A short review in a tabular form which facilitates a quick view on catalysts for CO oxidation (mainly cobalt ones) is represented.
Requirements to properties of protective-technological coatings for the tin bronze melting from secondary raw materials were formulated in the work. The choice of model glasses compositions in the initial Na2O-B2O3-SiO2 system on the basis of the melting parameters values was made. Non-scarce and inexpensive raw materials for protective coatings were selected. Also the best glass composition was determined based on the complex of chosen properties. The formation mechanism of the selected composition glassy melting by using DTА and XRDА was studied.
Two samples of brominated multi-walled carbon nanotubes [(Br)n-MWCNTs] produced by the plasma-chemical technique were involved in the liquid-phase initiated oxidation of cumene. The powerful catalytic effect of (Br)n-MWCNTs has been confirmed to recommend the substances for the use in oxidation of alkyl aromatic hydrocarbons as active additives. Obviously this phenomenon originates from the peculiarities of electronic configuration of (Br)n-MWCNTs pattern.
Research of the influence of oxygen and nitrogen containing organic additives to the catalyst on the main parameters of the process of cyclohexane oxidation have been conducted. A wide range of nitrogen and oxygen containing compounds and compounds based on polyglycols with varying molecular weight have been used as additives. The obtained results have been analyzed in view of the structural features of the studied additives and the probability of their interaction with the catalyst and intermediate products of oxidation with subsequent formation of intermediate complexes or associates.
The oxidation rate of ferrum(II) to ferrum(III) by air oxygen in water has been investigated in the horizontal absorber with bucket-like dispersers. The reaction order relative to Fe2+ and –OH ions has been determined based on established dependencies of ferrum(II) ions concentration on dispersion time at their various initial concentrations and medium pH. It has been shown for the first time that at pH = 5.5–6.2 in water during oxidation of ferrum(II) ions an autocatalysis occurs due to the formed ferrum(III) ions.
Mechanism of catalysis with binary and triple catalytic systems based on redox inactive metal (lithium) compound {LiSt+L2} and {LiSt+L2+PhOH} (L2=DMF or HMPA), in the selective ethylbenzene oxidation by dioxygen into -phenylethyl hydroperoxide is researched. The results are compared with catalysis by nickel-lithium triple system {NiII(acac)2+LiSt+PhOH} in selective ethylbenzene oxidation to PEH. The role of H-bonding in mechanism of catalysis is discussed.