Properties of electrorheological fluids based on nanocrystalline cerium dioxide

Effect of conditions of nanocrystalline cerium dioxide preparation from aqueous solutions on its composition and physicochemical properties and on dielectric characteristics of CeO₂ suspensions in polydimethylsiloxane PMS-20 and the magnitude of electrorheological effect for these suspensions has been analyzed. Relationship between physicochemical properties of CeO₂ nanopowders and polarization and functional characteristics of electrorheological fluids derived therefrom has been established.     

Mechanism of CO oxidation on catalysts prepared by pyrolysis of transition metal β-diketonates on a synthetic ceramic foam matrix

Kinetic and activation parameters of carbon monoxide oxidation on catalysts prepared by pyrolysis of the transition metals β-diketonates on synthetic ceramic foam matrices of different nature were measured in the absence of oxygen in the reaction mixture. Based on the kinetic data and infrared spectroscopy, the contributions of conjoint and split reaction mechanisms of CO oxidation as a function of temperature and nature of the carrier were estimated.     

Effect of silicon compounds on the pyrolysis of propane-butane hydrocarbon mixture

The effect of silicon-containing catalysts on the pyrolysis of propane-butane hydrocarbon mixture in a flow system was studied in the temperature range 500–850°C, the rate of the gas mixture flow 50–100 ml min⁻¹, contact time 0.1–12.0 s, and the value of the heterogeneity factor 0.1–2.1×10⁷ cm⁻¹. The catalytic activity of different systems under similar conditions was compared, and the influence of various factors on the yield of ethylene and propylene was studied. The most active silicon-containing catalyst for the pyrolysis of propane-butane hydrocarbon mixture was found.     

Carbonylation of Methanol with Carbon Monoxide in the Presence of Sulfur-containing Catalysts

Physicochemical features of methanol carbonylation with carbon monoxide catalyzed with sodium sulfides Na_2Sx (x = 1, 2, 4) were studied. The effect of admixtures of sulfur dioxide in the gas phase on the yield of the target product (methyl formate) was revealed.     

Oxidation of Carbon Monoxide on Co-, Ni-, and Cu-containing Catalysts Prepared by Pyrolysis of Metal β-Diketonates on Synthetic Foamed Ceramics

Catalytic systems containing Co, Ni, and Cu composite coatings prepared by gas-phase thermolysis of metal acetylacetonates and hexafluoroacetylacetonates on synthetic foamed ceramics were suggested for oxidation of CO to CO₂. The relative activities of the catalysts and the kinetic and activation parameters of CO oxidation were determined. The catalytic activity depends on the catalyst preparation procedure.     

“Foamed” Ceramic Supports for Catalysts of Carbon Monoxide Oxidation

A series of foamed ceramic heat- and mosture-resistant catalysts were developed, including the catalysts promoted with Pd, Ba, Mn, and V compounds for oxidation of CO to CO₂; their relative activity was determined.