Synthesis of a new monomer for sulfonated poly(arylene ether sulfones)

Russian Chemical Bulletin - 4-({2,4-Bis[(4-chlorophenyl)sulfonyl]phenyl}thio)benzenesulfonic acid was synthesized based on the scheme suggested from the results of retrosynthetic analysis. This...     

Rhodium-technetium catalysts in the dehydrogenation of cyclohexane

The catalytic properties of a Rh-Tc/support (-Al₂O₃, SiO₂, or MgO) system in the dehydrogenation of cyclohexane have been investigated. A nonadditive increase in the catalytic activity of bimetallic catalysts in comparison with monometallic systems has been established. This effect depends on the ratio of the amounts of the supported metals and on the nature of the support. Diffuse reflectance spectra showed the presence of ionic forms of the metals in the bimetallic catalysts. Analysis of the catalytic and optical properties allowed one to draw the conclusion that the synergistic effect is explained by the formation of Rh_xTc_y clusters.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1563–1566, September, 1994.     

Regularities of formation and catalytic properties of supported cobaltites in the oxidation of CO and hydrocarbons and in the reduction of nitrogen oxides

The catalytic properties of supported cobaltites MCo₂O₄ (M=Cu, Mn, Zn, Mg) in the oxidation of CO, C₃H₆, and ethylbenzene and reduction of nitrogen oxides were investigated. The catalytic activity depends on the calcination temperature and the nature of the cation. The regularities of formation and the state of the surface of the catalysts were studied by IR spectra and diffuse reflectance spectra in the UV and visible regions. Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1547–1550, September, 2000.     

Copolymerization of N-Vinyl-4,5,6,7-tetrahydroindole with Acrylamide

Radical copolymerization of N-vinyl-4,5,6,7-tetrahydroindole with acrylamide in dimethylformamide was studied, and the relative activity constants of the monomers were determined.     

Microwave Sample Preparation in the Determination of Metals in Waste Water

The potentialities of the microwave preparation of waste-water samples were examined in the determination of metals in real samples by atomic absorption and inductively coupled plasma atomic emission spectrometry. Microwave sample preparation was compared to the conventional thermal mineralization of waste waters.