Ru-Containing Polymeric Catalysts for Cellulose Conversion to Polyols

In this paper Ru-containing catalysts based on hypercrosslinked polystyrene (MN-270) and its functional analogues (MN-100 and MN-500) were studied for the first time in cellulose hydrolytic hydrogenation. The catalysts were characterized using transmission electron microscopy (TEM), high resolution TEM, and porosity measurements. Catalytic studies demonstrated that the catalyst containing 1.0 % Ru and based on MN-270 is the most active. The total yield of sorbitol and mannitol was 50 % on the average at 85 % cellulose conversion.     

Biocatalitic Oxidation of 2,3,6-Trimethylphenol Over Immobilized Horseradish Peroxidase in Nonaqueous Media

In this work various samples of horseradish peroxidase immobilized over organic and inorganic supports were synthesized and studied in 2,3,6-trimethylphenol biocatalitic oxidation. Silica, alumina and commercial samples of polymers MN-100, Sepabeads EC-HA were used as the carriers for horseradish peroxidase. Different methods of immobilization including treatment with chitosan, glutaric dialdehyde and carbodiimide were used to enhance catalytic activity. For synthesized catalysts optimal conditions for 2,3,6-trimethylphenol (main intermediates in vitamin E synthesis) oxidation providing high degree of conversion (more than 95%) and high selectivity to target products (more then 98%) were found. Physicochemical investigations (FTIR spectroscopy, XPS, nitrogen physosorption) of optimal biocatalytic systems were provided.     

Polymer Composite Materials Based on Basalt

Theoretical Foundations of Chemical Engineering - In construction there is increased interest in using basalt fibers as an alternative to traditional polymer composite materials based on glass,...     

Effect of SO2 impurity on the optical transmission of As2S3 glass

To assess the effect of sulfur dioxide impurity on the optical properties and absorption spectrum of glassy arsenic sulfide, we have prepared As₂S₃ glass samples containing 0.01 to 0.12 wt % SO₂ and have measured their transmission spectra in the range 500–5000 cm^?1. The extinction coefficient of sulfur dioxide in glassy arsenic sulfide, evaluated from the intensity of the 1158-cm^?1 absorption band, is 10.0 ± 0.7 cm^?1/wt%.     

The structure of fullerene C60 films modified by helium glow discharge plasma

The structure of fullerene C₆₀ films modified by helium dc glow discharge plasma was studied using Raman scattering spectroscopy. The vibrational spectra of the C₆₀ films exhibit certain features depending on the plasma treatment duration. The helium ion bombardment leads to the degradation of the fullerene structure and the formation of an amorphous carbon phase. The coefficient of carbon sputtering by helium was estimated.