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In the present work the reaction between carbon monoxide and oxygen, in particular, repeated inflammation of their mixture at low pressure is studied by means of the simultaneous recording of change of pressure and intensity of chemiluminescence in the course of process. The lower limit of ignition was also measured., Working copy machine trans. of mono. Gorenie i Vzryv, Moscow, 1972 p646-649, by Carol S. Nack.

In branched-chain processes, which take place at low pressures, for example, under conditions of rarefied flames, the role of the reactions of the interaction of chains during triple collisions is insignificant. Under these conditions, however, at a noticeable rate other reactions of the interaction of chains can flow which are realized without the participation of a third particle. In the present work the role of the negative interaction of chains and heterogenic reactions of active centers during the burning of hydrogen are examined., Edited machine trans. of mono. from Gorenie i Vzryv, Moscow, 1972 p625-633, by Charles T. Ostertag, Jr.

Contents: Determination of reaction rate constant for the reaction of the hydroxyl radical with hydrogen, and Kinetic computations of low temperature flames of hydrogen and carbon monoxide. (Author)

The kinetics of heterogeneous recombination of hydrogen and oxygen atoms were studied at 570-660C in a vessel coated with MgO under conditions of lower ignition limit of CO and O2 mixtures containing small additions of H2 or H-containing compounds. In some cases, the reaction mixture was diluted with N. The dependence of the lower ignition limit on the reaction temperature was determined and the reaction mechanism is discussed. Activation energies and recombination coefficients for a series of reactions were determined. Heterogeneous chain termination was found to occur in the diffusion region and absolute values of reaction rate constants can be determined by the method of ignition limits. (Author), Trans. of Armyanskii Khimicheskii Zhurnal (USSR) v20 n8 p577-584 1967.

The investigation was conducted to check the mechansim of combustion of carbon monoxide in presence of ethylene by detecting free oxygen and hydrogen atoms in it and by measuring their concentration. Experiments were conducted with a stoichiometric mixture of carbon monoxide and oxygen, containing from 0.09 to 2.9% of ethylene. The temperature of the experiments was 670 - 675 degrees, pressure -5 mm Hg. Volumetric rate of the stream was 25 cu cm/sec at normal conditions, which corresponded to a linear rate, equaling 4.4 m/sec under flame conditions. In these conditions EPR signals of hydrogen and oxygen atoms were registered. Concentrations of H and O atoms with increase in ethylene content in the mixture rise at first and then decrease. The hydrogen and oxygen concentration is comparable in value. The initial content of ethylene, at which the concentration of oxygen atoms is maximum, is close to the ethylene concentration, at which the lower limit of spontaneous ignition of the mixture is minimum (0.2%). With a rise in temperature the concentrations of H and O atoms increase, indicating that combustion under experimental conditions is not much greater., Unedited rough draft trans. of Akademiya Nauk Armyanskoi SSR, Erevan. Izvestiya. Seriya Khimicheskikh Nauk, v16 n3 p201-3 1963. Available copy will not permit fully legible reproduction. Reproduction will be made if requested by users of DDC. Copy is available for public sale.