Catalytic properties of phosphorus and sodium promoted VMo catalysts in acrolein oxidation

The change in the ratio of stepwise and concerted routes of acrolein conversion to complete oxidation products upon promotion of a V-Mo catalyst by phosphorus and sodium dopants is ascribed to modification of surface acid-base properties.

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V-Mo - .

     

Reactivity of hydrogen adsorbed on platinum black towards ethylene

TPD studies of the reactivity of hydrogen adsorbed on dispersed Pt-black towards ethylene at –90, 30 and 200°C indicate that molecular forms of hydrogen with E_des from 3 to 16 kcal/mol are reactive species.

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Pt- –90, 30, 200°C . , . 3 16 /.

     

Radiolytic gas formation under γ-irradiation of oxalic acid solutions

Radiolytic gas formation under -irradiation (10⁴–10⁶ Gy) of 10^–2–10^–4 M aqueous solutions of oxalic acid at 25–60°C was studied.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 11, 2004, pp. 1836–1839.Original Russian Text Copyright © 2004 by Popova, Voronin, Byvsheva.     

Investigation of the electrical and photoelectric properties of manganese-doped gallium arsenide as a material for photoresistive detectors

An investigation was made into the electrical and photoelectric properties of gallium arsenide with an initial electron density 5×10¹⁵–4×10¹⁷ cm^–3 doped with Mn in different thermodynamic diffusion regimes characterized by diffusion temperatures of 900 and 1000°C and arsenic vapor pressure 10^–2 and 10^–3 atm. The ionization energy and defect concentration were determined by a computer analysis of the equilibrium hole density determined from the Hall effect. Centers with ionization energy 0.08–0.10 eV were found, their concentration varying from 2×10¹⁹ to 2×10²⁰ cm^–3 depending on the diffusion temperature and the doping level of the original crystals. Data obtained by investigating the stationary intrinsic photoconductivity were used to determine a hole lifetime of t_p 10^–9 sec. The photoconductivity spectra were investigated in the range 0.5–2 eV at 77°K, and defects with ionization energy E_v + 0.6 eV were found in all samples. The impurity photoconductivity at wavelength 10.6 m was investigated. It was shown that GaAsMn can be used as a material for impurity photoresistors.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 15–19, March, 1981.     

Water-soluble polyelectrolytes based on polyacrylonitrile for wastewater treatment

The possibility of modifying oxidized asphalt by performing polycondensation of maleic anhydride with aliphatic amines of various chemical structures in the dispersion medium was considered. The influence of the reactant structures and reaction conditions on the physicomechanical and structural-rheological properties of the polymer-modified asphalt was examined.     

Preparation of 1,1,5-trihydrooctafluoropentyl dehydroabietate

1,1,5-Trihydrooctafluoropentyl dehydroabietate was prepared by esterification of dehydroabietic acid with 1,1,5-trihydrooctafluoropentanol.     

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.     

Spin-lattice relaxation in biopolymeric sorbents in the presence of water

The effects of water on relaxation processes in polysaccharides were investigated by the NMR, adsorption, and comparative methods. It was shown that the relaxation vitrification transition that occurred in polysaccharides during the formation of an adsorption layer about two water molecules thick made the largest contribution to the spin-relaxation processes in the polymer-water system.