kinetics

The kinetic mechanism of cobalt-silver and cobalt-tungsten alloys electrodeposition from citrate-pyrophosphate and citrate electrolyte correspondingly has been established. The influence of electrolyte component ratios as well as polarization pulse on/off time ratios on cobalt alloy composition and its current efficiency has been determined. The cobalt-silver and cobalt-tungsten alloys have been shown to possess catalytic and anticorrosion properties.

Influence of bismuth ions on kinetics of lead dioxide electrodeposition from methanesulfonate electrolytes on Pt-electrode was studied. Experimental results are interpreted to be consistent with the mechanism proposed previously for lead dioxide electrodeposition in literature. The presence of bismuth ions in the electrodeposition solution causes decreasing rate constants of lead dioxide formation due to additive adsorption.

Disinfective action of physical-chemical effects accompanying hydrodynamic cavitation on the microorganisms sanitary indices in water has been studied. Disinfection kinetics was found to be dependent on the cavitation field characteristics and the microbes population. Based on the structural-morphological investigation of the E.coli bacteria it was found that antimicrobial effect is obtained due to the mechanical rupture of cells and chemical disinfection, which results from the hydroxyl radicals and hydrogen peroxide effect.

Experimental and analytical investigations of the heat transfer process during encapsulation of dispersed materials in quasi-liquefied state are presented. The heat-transfer coefficients for different types of materials have been determined during their heating depending on air rate.

The dissolution kinetics of potassium sulfate dissolved in water under pneumatic mixing has been investigated. The mass transfer coefficients were determined by the experiments, as well as on the basis of the local isotropic turbulence theory. The ratio between theoretical and experimental data was found to be satisfying that allows to determine the theoretical mass transfer coefficient to calculate the mentioned process.

New oligomer with peroxy, primary and secondary hydroxy groups has been synthesized on the basis of peroxy derivative of ED-24 epoxy resin (PO) and PolyTHF-2000 oligoether according to the developed procedure. The effect of the catalysts nature and amount, temperature and process time on the reaction rate has been studied. Benzyltriethylammonium chloride, potassium hydroxide, 1,4-diazobicyclooctane and the mixture composed of benzyltriethylammonium chloride and KOH (molar ratio 1:1) were used as the catalysts.

The study is aimed at investigating the thermal behavior and decomposition kinetics of torrefied oil palm empty fruit bunches (OPEFB) briquettes using a thermogravimetric (TG) analysis and the Coats-Redfern model. The results revealed that thermal decomposition kinetics of OPEFB and torrefied OPEFB briquettes is significantly influenced by the severity of torrefaction temperature. Furthermore, the temperature profile characteristics; Tonset, Tpeak, and Tend increased consistently due to the thermal lag observed during TG analysis.