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All Library Books, journals and Electronic Records Telegrafenberg

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  • 1
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The corrosion of 18% Cr, 8% Ni steel has been studied in alkali metal sulphate eutectic melts as a function of the partial pressures of oxygen and SO3 in equilibrium with the melt at 873°K. The rate of corrosion has been measured in terms of the corrosion current corresponding to the balanced rates of the anodic and cathodic processes at the unpolarized metal surface. The effect of SO3 on the rate of corrosion is interpreted in terms of its role as an oxidizing agent and also in terms of its effect on the solubility of the corrosion products in the melt. The difference in the relative importance of oxygen and SO3 as the oxidizing agent is interpreted in terms of their different solubilities in the sulphate melt.
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  • 2
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Anolytes adjacent to dissolving metal surfaces have been sampled after freezing using liquid nitrogen/ isopentane mixtures. Metal ion, anion and pH profiles were obtained after analysis of the samples. The results are discussed in terms of the solution flow rate and of the regimes obtaining at the time of freezing.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The effective resistivity of the discontinuous metal phase in a fluidized bed copper electrode is derived from measurements of the potential distribution in the solution. The values are similar to those which have been previously observed for a fluidized bed of silver-coated particles and are compared with a theoretical expression based on a model of charge sharing during single particle elastic collisions. It is shown that the metal resistivity follows the predicted dependence on bed expansion and solution resistivity; the constant of proportionality is, however, different and this is attributed to a stagnation zone close to the feeder electrode. Such a stagnant zone is also indicated by comparison of the experimental and theoretically predicted distribution of potential in the metal phase. The diffusion controlled removal of copper from 10−4 M copper sulphate is also shown to follow the theoretically predicted behaviour; the mass transfer coefficient indicates a high degree of turbulence within the bed. It is shown that scale-up factors of the order of 300 can be achieved in the processing of such dilute solutions. In view of the relatively high resistivity of the metal phase it is suggested that practical systems would arrange for a current and fluid flow to be at right angles to each other.
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  • 5
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The ‘Norbide’, boron carbide, electrode has been shown to be exceptionally good in terms of its chemical inertness, rapid response and high hydrogen overvoltage. It has been applied especially in potentiometric and polarographic studies of the Ir(IV)-Ir(III) system in various media. By its means, supported by evidence from use of other cathodes, certain previous work has been confirmed and standard or formal redox potentials of the following systems have been determined: Ir(IV)-Ir(III)-ClO 4 − (M HClO4, 1·27 V; Ir (IV)-Ir(III)-SO 4 2− (0·18M H2SO4), 1·08 V; Ir(IV)-Ir(III)-PO 4 3− (0·3M H3PO4), provisionally 0·99 V; IrCl 6 2− -IrCl 6 3− (0·1M NaClO4 or NaCl), 0·899 V; IrBr 6 2− -IrBr 6 2− (0·1M NaClO4or NaBr), 0·838 V. The potentials fall in the expected sequence. The possibility of analytical application of the ‘Norbide’ and rotating platinum electrode has also been examined.
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  • 6
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Consideration is given to four alternativein situ methods of determining the area of a dropping mercury electrode. These methods are particularly relevant to those conditions where ordinary calibration procedures are not possible, for example, in closed systems at elevated pressures and temperatures.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 1 (1971), S. 163-166 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract When designing and building new mercury-based chlorine plants special attention must be given to features which will help reduce mercury pollution of the environment. The article describes a new Swedish chlorine plant including mercury emission limits set by the authorities, general principles and some specific details in the plant design to minimize mercury losses and practical experience after nearly one year of operations.
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  • 8
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The feasibility of the electrochemical generation of Fenton's reagent is demonstrated and the subsequent reaction of produced OH radical with benzene studied. Under the proposed working conditions, phenol is obtained as the main product, with current yield as high as 60% (on the basis of 3 F/mole of phenol) and with only traces of other higher oxidized compounds. At fixed H2SO4 concentration and with suitable [Fe3+]/[O2] ratio, a maximum in current yield is obtained; this yield may presumably be increased if continuous removal of phenol is employed during the electrolysis.
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  • 9
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Based on the optimum conditions arrived at in the laboratory experiments, large-scale trials have been carried out for the preparation of sodium perchlorate by the direct oxidation of sodium chloride in a single step using a graphite substrate lead dioxide anode. Two cells of 75 A capacity and one 400 A cell were run continuously at an anode current density of 20 A/dm2 and a temperature of 45°–50°C. The cell performance with these anodes is given. Potassium and ammonium perchlorates formed by double decomposing the sodium perchlorate obtained by this method with the respective chlorides are pure and conform to the stringent specifications.
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  • 10
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A method which treats the fuel cell anode as a chemical reactor is developed to predict fuel cell performance. The method is based on experimentally measured residence time distribution parameters and differential cell kinetic data. The apparatus and experimental technique used to obtain the gas-phase residence time distributions are described. Kinetic data obtained from differential cell tests of the electrodes are used to evaluate an empirical rate expression. Axial dispersion model solutions for flow with volume change are obtained, based on the measured Peclet numbers and empirical rate expressions, and compared with experimental data from operating large high-temperature molten carbonate fuel cells. Agreement between the model and the experimentally determined data is very good, but only for low conversions of the fuel.
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